Analysis Report (AR21-102B)

MAR-10330097-1.v1: DearCry Ransomware

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Description

Malware Analysis Report
10330097.r1.v1
2021-04-07

Notification

This report is provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained herein. The DHS does not endorse any commercial product or service referenced in this bulletin or otherwise.

This document is marked TLP:WHITE--Disclosure is not limited. Sources may use TLP:WHITE when information carries minimal or no foreseeable risk of misuse, in accordance with applicable rules and procedures for public release. Subject to standard copyright rules, TLP:WHITE information may be distributed without restriction. For more information on the Traffic Light Protocol (TLP), see http://www.us-cert.gov/tlp.

Summary

Description

Six files were submitted for analysis. The files were identified as DearCry ransomware. The malware encrypts files on a device and demands ransom in exchange for decryption.

For a downloadable copy of IOCs, see: MAR-10330097-1.v1.stix.

Emails (2)

konedieyp[@]airmail.cc

uenwonken[@]memail.com

Submitted Files (6)

027119161d11ba87acc908a1d284b93a6bcafccc012e52ce390ecb9cd745bf27 (027119161d11ba87acc908a1d284b9...)

10bce0ff6597f347c3cca8363b7c81a8bff52d2ff81245cd1e66a6e11aeb25da (10bce0ff6597f347c3cca8363b7c81...)

2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff (2b9838da7edb0decd32b086e47a31e...)

e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6 (e044d9f2d0f1260c3f4a543a1e67f3...)

fdec933ca1dd1387d970eeea32ce5d1f87940dfb6a403ab5fc149813726cbd65 (fdec933ca1dd1387d970eeea32ce5d...)

feb3e6d30ba573ba23f3bd1291ca173b7879706d1fe039c34d53a4fdcdf33ede (feb3e6d30ba573ba23f3bd1291ca17...)

Findings

2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff

Tags

downloaderloaderransomwaretrojan

Details
Name 2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff
Size 1322496 bytes
Type PE32 executable (console) Intel 80386, for MS Windows
MD5 0e55ead3b8fd305d9a54f78c7b56741a
SHA1 f7b084e581a8dcea450c2652f8058d93797413c3
SHA256 2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff
SHA512 5c3d58d1001dce6f2d23f33861e9c7fef766b7fe0a86972e9f1eeb70bfad970b02561da6b6d193cf24bc3c1aaf2a42a950fa6e5dff36386653b8aa725c9abaaa
ssdeep 24576:LU5NX2yJOiUXmEICxu2WAP0NIzkQM+KpPRQ9StIUDpl1fpxkHVZgMCS+:L7XP7P9o5QzUtl1fpxkHVZgMC3
Entropy 6.994611
Antivirus
Ahnlab Ransomware/Win.DoejoCrypt
Antiy Trojan[Ransom]/Win32.DearCry
Avira TR/FileCoder.HW
BitDefender Trojan.GenericKD.36477740
ClamAV Win.Ransomware.Dearcry-9840778-0
Comodo Malware
Cyren W32/Trojan.FOGJ-5046
ESET a variant of Win32/Filecoder.DearCry.A trojan
Emsisoft Trojan.GenericKD.36477740 (B)
Ikarus Trojan-Ransom.FileCrypter
K7 Trojan ( 005790de1 )
Lavasoft Trojan.GenericKD.36477740
McAfee Ransom-DearCry!0E55EAD3B8FD
Microsoft Security Essentials Ransom:Win32/DoejoCrypt.A
NANOAV Trojan.Win32.Encoder.ipilfs
NetGate Trojan.Win32.Malware
Quick Heal Ransom.DearCry.S19261705
Sophos Troj/Ransom-GFE
Symantec Downloader
TACHYON Ransom/W32.DearCry.1322496
TrendMicro Ransom.56DC2A23
TrendMicro House Call Ransom.56DC2A23
Vir.IT eXplorer Ransom.Win32.DearCry.CUQ
VirusBlokAda TrojanRansom.Encoder
Zillya! Trojan.Encoder.Win32.2195
YARA Rules
  • rule CISA_10330097_01 : trojan downloader ransomware DEARCRY
    {
       meta:
           Author = "CISA Code & Media Analysis"
           Incident = "10330097"
           Date = "2021-03-31"
           Last_Modified = "20210331_1630"
           Actor = "n/a"
           Category = "Trojan Downloader Ransomware"
           Family = "DEARCRY"
           Description = "Detects DearCry Ransomware"
           MD5_1 = "0e55ead3b8fd305d9a54f78c7b56741a"
           SHA256_1 = "2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff"
           MD5_2 = "cdda3913408c4c46a6c575421485fa5b"
           SHA256_2 = "e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6"
           MD5_3 = "c6eeb14485d93f4e30fb79f3a57518fc"
           SHA256_3 = "feb3e6d30ba573ba23f3bd1291ca173b7879706d1fe039c34d53a4fdcdf33ede"
       strings:
           $s0 = { 8B 85 04 EA FF FF 50 8B 8D 08 EA FF FF 51 8B 55 14 52 8B 45 10 50 8D 8D 68 F0 FF FF 51 8B 95 00 EA FF FF 52 }
           $s1 = { 43 72 79 70 74 6F 50 72 6F 2D 58 63 68 42 }
           $s2 = "-----BEGIN RSA PUBLIC KEY-----"
           $s3 = ".CRYPT"
       condition:
           all of them
    }
ssdeep Matches
99 feb3e6d30ba573ba23f3bd1291ca173b7879706d1fe039c34d53a4fdcdf33ede
PE Metadata
Compile Date 2021-03-09 03:08:39-05:00
Import Hash f8b8e20e844ccd50a8eb73c2fca3626d
PE Sections
MD5 Name Raw Size Entropy
4289116f218aa083456871506085e1be header 1024 2.596118
46c15879afc7b600a23284d8e72f87aa .text 976896 7.069452
d0093b4c33543ebd59b2c22c7e71670f .rdata 265728 6.128934
40f8722b3a267afab34d8909cf5da682 .data 25600 4.794047
a0bf446401bdd255b7f7cb0215177d73 .rsrc 512 5.108717
bcd8233433c686e481a6c5a4f1f263ac .reloc 51712 5.474063
Packers/Compilers/Cryptors
Microsoft Visual C++ ?.?
Relationships
2b9838da7e... Related_To konedieyp[@]airmail.cc
2b9838da7e... Related_To uenwonken[@]memail.com
Description

This file is a 32-bit Windows executable application. This file has been identified as a variant of the DearCry Ransomware. The ransomware attempts to encrypt specific files, identified by file extension, on the target system utilizing the Advanced Encryption Standard (AES) and Rivest–Shamir–Adleman (RSA) encryption algorithms. The ransomware contains the following hard coded public RSA key, which is utilized to encrypt the target system's user files.

--Begin RSA public key--
MIIBCAKCAQEAyLBClz9hsFGRf9fk3z0zmY2rz2J1qqGfV48DSjPV4lcwnhCi4/5+C6UsAhkdI4/5HwbfZBAiMySXNB3DxVB2hOrjDjIeVAkFjQgZ19B+KQFWkSo1ubeVdHjwdv74evEur9Lv9HM+89iZdzEpVPO+AjOTtsQgFNtmVecC2vmw9m60dgyR1CJQSg6Moblo2NVF50AK3cIG2lVh82ebgedXsbVJpjVMc03aTPWV4sNWjTO3o+aX6Z+VGVLjuvcpfLDZb3tYppkqZzAHfrCt7lV0qO47FV8sFCltuoNiNGKiP084KI7b3XEJepbSJB3UW4o4C4zHFrqmdyOoUlnqcQIBAw==-
--End RSA public key--

During runtime, the ransomware loads the hard-coded RSA public key. It then attempts to identify all drives that are connected to the attached system, from Drive A: to Drive Z:. For each drive identified, the ransomware will enumerate it and encrypt files with the following file extensions:

--Begin targeted file extensions--
.TIF .TIFF .PDF .XLS .XLSX .XLTM .PS .PPS .PPT .PPTX .DOC .DOCX .LOG .MSG .RTF .TEX .TXT .CAD .WPS .EML .INI .CSS .HTM .HTML .XHTML .JS .JSP .PHP .KEYCHAIN .PEM .SQL .APK .APP .BAT .CGI .ASPX .CER .CFM .C .CPP .GO .CONFIG .PL .PY .DWG .XML .JPG .BMP .PNG .EXE .DLL .CAD .AVI .H.CSV .DAT .ISO .PST .PGD .7Z .RAR .ZIP .ZIPX .TAR .PDB .BIN .DB .MDB .MDF .BAK .LOG .EDB .STM .DBF .ORA .GPG .EDB .MFS
--End targeted file extensions--

It will then write the ransom note "readme.txt" to every folder it enumerates on the connected drive.

--Begin ransom note--
Your file has been encrypted!
                        If you want to decrypt, please contact us.
                        konedieyp[@]airmail.cc or uenwonken[@]memail.com
                        And please send me the following hash!
                        638428e5021d4ae247b21acf9c0bf6f6
--End ransom note--

Next, the ransomware will attempt to encrypt files on the target system that have the file extensions listed above. After encrypting the target system's user files the ransomware will drop the ransom note "readme.txt" within folders with encrypted files on the target system.

The ransomware will then delete the original copy of the files and then replace them with encrypted copies of themselves with the file extension changed to .CRYPT. Before actually deleting the original target file, the malware will overwrite it with the repeating value 0x41 in order to make recovery of the file using computer forensics software impossible.

Before encrypting the target system's user files the malware will encrypt information about the files, including the file's full path and the AES key used to encrypt it, which will also be used to decrypt it. This data will be encrypted using the hard coded Public RSA key mentioned above, and added to the top of the encrypted file. Note: The ransomware will generate a new AES key for every file.

During execution, the ransomware runs a service named “msupdate." After the encryption process and installing the ransom note, the “msupdate" service is removed, which could indicate that the ransomware was executed under the Windows "msupdate" service.

Illustrated below are strings of interest extracted from this binary. These strings indicate the encryption process of the target system's user files is implemented utilizing the OPENSSL library:

--Begin strings of interest--
crypto\evp\e_aes.c
crypto\bio\bio_lib.c
crypto\rsa\rsa_lib.c
crypto\evp\evp_enc.c
assertion failed: bl <= (int)sizeof(ctx->buf)
assertion failed: b <= sizeof ctx->buf
assertion failed: b <= sizeof ctx->final
assertion failed: EVP_CIPHER_CTX_iv_length(ctx) <= (int)sizeof(ctx->iv)
assertion failed: ctx->cipher->block_size == 1 || ctx->cipher->block_size == 8 || ctx->cipher->block_size == 16
%lu:%s:%s:%d:%s
secure memory buffer
memory buffer
crypto\bio\bss_mem.c
CERTIFICATE REQUEST
NEW CERTIFICATE REQUEST
PKCS7
CERTIFICATE
RSA PUBLIC KEY
DH PARAMETERS
X9.42 DH PARAMETERS
crypto\rsa\rsa_crpt.c
crypto\evp\evp_lib.c
assertion failed: l <= sizeof(c->iv)
assertion failed: j <= sizeof(c->iv)
init fail
called a function that was disabled at compile-time
internal error
passed a null parameter
called a function you should not call
malloc failure
fatal
missing asn1 eos
nested asn1 error
ECDSA lib
ENGINE lib
X509V3 lib
PKCS7 lib
BIO lib
EC lib
ASN1 lib
X509 lib
DSA lib
PEM lib
OBJ lib
BUF lib
EVP lib
DH lib
RSA lib
BN lib
system lib
gethostbyname
getsockname
getsockopt
setsockopt
getnameinfo
getaddrinfo
fread
opendir
WSAstartup
accept
listen
bind
ioctlsocket
socket
getservbyname
connect
fopen
KDF routines
ASYNC routines
CT routines
HMAC routines
CMS routines
FIPS routines
OCSP routines
engine routines
time stamp routines
DSO support routines
random number generator
PKCS12 routines
X509 V3 routines
PKCS7 routines
BIO routines
SSL routines
ECDH routines
ECDSA routines
elliptic curve routines
common libcrypto routines
configuration file routines
asn1 encoding routines
x509 certificate routines
dsa routines
PEM routines
object identifier routines
memory buffer routines
digital envelope routines
Diffie-Hellman routines
rsa routines
bignum routines
system library
unknown library
unknown
crypto\err\err.c
error:%08lX:%s:%s:%s
reason(%lu)
func(%lu)
lib(%lu)
crypto\modes\ocb128.c
crypto\threads_win.c
crypto\ex_data.c
OpenSSL PKCS#1 RSA (from Eric Young)
crypto\rsa\rsa_ossl.c
crypto\engine\eng_init.c
crypto\bn\bn_blind.c
crypto\bn\bn_lib.c
%I64i
OPENSSL_ia32cap
Service-0x
_OPENSSL_isservice
OpenSSL: FATAL
OpenSSL
no stack?
%s:%d: OpenSSL internal error: %s
crypto\engine\tb_cipher.c
?assertion failed: *sbuffer != NULL
assertion failed: *currlen <= *maxlen
assertion failed: *sbuffer != NULL || buffer != NULL
crypto\bio\b_print.c
<NULL>
0123456789abcdef
0123456789ABCDEF
0123456789
A-C
?FILE pointer
crypto\bio\bss_file.c
fopen('
','
crypto\buffer\buffer.c
@@You need to read the OpenSSL FAQ, https://www.openssl.org/docs/faq.html
....................
crypto\rand\md_rand.c
crypto\pem\pem_oth.c
X509_REQ
signature
sig_alg
req_info
X509_REQ_INFO
attributes
pubkey
subject
version
0123456789ABCDEF
Proc-Type:
ENCRYPTED
DEK-Info:
crypto\pem\pem_lib.c
phrase is too short, needs to be at least %d chars
Enter PEM pass phrase:
Proc-Type: 4,
BAD-TYPE
MIC-ONLY
MIC-CLEAR
ENCRYPTED
DEK-Info:
-----END
-----
-----BEGIN
CMS
PKCS #7 SIGNED DATA
TRUSTED CERTIFICATE
X509 CERTIFICATE
PARAMETERS
PRIVATE KEY
ENCRYPTED PRIVATE KEY
ANY PRIVATE KEY
assertion failed: strlen(objstr) + 23 + 2 * EVP_CIPHER_iv_length(enc) + 13 <= sizeof buf
assertion failed: EVP_CIPHER_iv_length(enc) <= (int)sizeof(iv)
Expecting:
X509_CRL
crl
X509_CRL_INFO
revoked
nextUpdate
lastUpdate
issuer
X509_REVOKED
extensions
revocationDate
serialNumber
PKCS7_ATTR_VERIFY
PKCS7_ATTR_SIGN
PKCS7_ATTRIBUTES
PKCS7_DIGEST
digest
PKCS7_ENCRYPT
PKCS7_SIGN_ENVELOPE
PKCS7_ENC_CONTENT
algorithm
content_type
PKCS7_RECIP_INFO
enc_key
key_enc_algor
PKCS7_ENVELOPE
enc_data
recipientinfo
PKCS7_ISSUER_AND_SERIAL
serial
PKCS7_SIGNER_INFO
unauth_attr
enc_digest
digest_enc_alg
auth_attr
digest_alg
issuer_and_serial
PKCS7_SIGNED
signer_info
cert
contents
md_algs
type
d.encrypted
d.digest
d.signed_and_enveloped
d.enveloped
d.sign
d.data
d.other
NETSCAPE_CERT_SEQUENCE
certs
crypto\evp\p_lib.c
%s algorithm "%s" unsupported
Public Key
crypto\pem\pem_pkey.c
RSA_OAEP_PARAMS
pSourceFunc
maskGenFunc
hashFunc
RSA_PSS_PARAMS
trailerField
saltLength
maskGenAlgorithm
hashAlgorithm
RSA
X509_PUBKEY
public_key
algor
H/O
</O
h/O
P/O
0/O
crypto\x509\x_pubkey.c
crypto\dsa\dsa_lib.c
DSA
priv_key
pub_key
DSA_SIG
crypto\dsa\dsa_asn1.c
crypto\ec\ec_key.c
assertion failed: eckey->group->meth->keygen != NULL
ECDSA_SIG
EC_PRIVATEKEY
publicKey
parameters
privateKey
ECPKPARAMETERS
value.implicitlyCA
value.parameters
value.named_curve
ECPARAMETERS
cofactor
order
base
curve
fieldID
X9_62_CURVE
seed
X9_62_FIELDID
fieldType
p.char_two
p.prime
X9_62_CHARACTERISTIC_TWO
p.ppBasis
p.tpBasis
p.onBasis
p.other
X9_62_PENTANOMIAL
certificate extensions
set-certExt
set-policy
set-attr
message extensions
set-msgExt
content types
set-ctype
Secure Electronic Transactions
id-set
pseudonym
generationQualifier
id-hex-multipart-message
id-hex-partial-message
mime-mhs-bodies
mime-mhs-headings
MIME MHS
mime-mhs
x500UniqueIdentifier
documentPublisher
audio
dITRedirect
personalSignature
subtreeMaximumQuality
subtreeMinimumQuality
singleLevelQuality
dSAQuality
buildingName
mailPreferenceOption
janetMailbox
organizationalStatus
friendlyCountryName
pagerTelephoneNumber
mobileTelephoneNumber
personalTitle
homePostalAddress
associatedName
associatedDomain
cNAMERecord
sOARecord
nSRecord
mXRecord
pilotAttributeType27
aRecord
lastModifiedBy
lastModifiedTime
otherMailbox
secretary
homeTelephoneNumber
documentLocation
documentAuthor
documentVersion
documentTitle
documentIdentifier
manager
host
userClass
photo
roomNumber
favouriteDrink
info
rfc822Mailbox
mail
textEncodedORAddress
userId
UID
qualityLabelledData
pilotDSA
pilotOrganization
simpleSecurityObject
friendlyCountry
domainRelatedObject
dNSDomain
rFC822localPart
documentSeries
room
document
account
pilotPerson
pilotObject
caseIgnoreIA5StringSyntax
iA5StringSyntax
pilotGroups
pilotObjectClass
pilotAttributeSyntax
pilotAttributeType
pilot
ucl
pss
data
Hold Instruction Reject
holdInstructionReject
Hold Instruction Call Issuer
holdInstructionCallIssuer
Hold Instruction None
holdInstructionNone
Hold Instruction Code
holdInstructionCode
aes-256-cfb
AES-256-CFB
aes-256-ofb
AES-256-OFB
aes-256-cbc
AES-256-CBC
aes-256-ecb
AES-256-ECB
aes-192-cfb
AES-192-CFB
aes-192-ofb
AES-192-OFB
aes-192-cbc
AES-192-CBC
aes-192-ecb
AES-192-ECB
aes-128-cfb
AES-128-CFB
aes-128-ofb
AES-128-OFB
aes-128-cbc
AES-128-CBC
aes-128-ecb
AES-128-ECB
Microsoft CSP Name
CSPName
ecdsa-with-SHA1
prime256v1
prime239v3
prime239v2
prime239v1
prime192v3
prime192v2
prime192v1
id-ecPublicKey
characteristic-two-field
prime-field
ANSI X9.62
ansi-X9-62
X509v3 No Revocation Available
noRevAvail
X509v3 AC Targeting
targetInformation
X509v3 Policy Constraints
policyConstraints
role
id-aca-encAttrs
Subject Information Access
subjectInfoAccess
ac-proxying
md4WithRSAEncryption
RSA-MD4
clearance
Selected Attribute Types
selected-attribute-types
Domain
domain
domainComponent
dcObject
dcobject
Enterprises
enterprises
Mail
SNMPv2
snmpv2
Security
security
Private
private
Experimental
experimental
Management
mgmt
Directory
directory
iana
IANA
dod
DOD
org
ORG
directory services - algorithms
X500algorithms
rsaSignature
Trust Root
trustRoot
path
valid
Extended OCSP Status
extendedStatus
OCSP Service Locator
serviceLocator
OCSP Archive Cutoff
archiveCutoff
OCSP No Check
noCheck
Acceptable OCSP Responses
acceptableResponses
OCSP CRL ID
CrlID
OCSP Nonce
Nonce
Basic OCSP Response
basicOCSPResponse
ad dvcs
AD_DVCS
AD Time Stamping
ad_timestamping
id-cct-PKIResponse
id-cct-PKIData
id-cct-crs
id-qcs-pkixQCSyntax-v1
id-aca-role
id-aca-group
id-aca-chargingIdentity
id-aca-accessIdentity
id-aca-authenticationInfo
id-pda-countryOfResidence
id-pda-countryOfCitizenship
id-pda-gender
id-pda-placeOfBirth
id-pda-dateOfBirth
id-on-personalData
id-cmc-confirmCertAcceptance
id-cmc-popLinkWitness
id-cmc-popLinkRandom
id-cmc-queryPending
id-cmc-responseInfo
id-cmc-regInfo
id-cmc-revokeRequest
crypto\asn1\tasn_enc.c
crypto\asn1\tasn_new.c
crypto\asn1\tasn_fre.c
crypto\asn1\a_dup.c
assertion failed: niv <= EVP_MAX_IV_LENGTH
assertion failed: nkey <= EVP_MAX_KEY_LENGTH
crypto\evp\evp_key.c
ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/
?456789:;<=
!"#$%&'()*+,-./0123
crypto\evp\encode.c
assertion failed: ctx->length <= (int)sizeof(ctx->enc_data)
assertion failed: n < (int)sizeof(ctx->enc_data)
crypto\asn1\ameth_lib.c
X509_EXTENSIONS
Extension
X509_EXTENSION
critical
--End strings of interest--

Screenshots
Figure 1 - Screenshot of the data that will be prepended to an encrypted file. This data will contain an AES key that can be used to decrypt the file, as well as the full path of the file. This block will be encrypted via the hard-coded RSA key before it is prepended to the newly encrypted files. The ransomware will generate a new AES key for each file it encrypts.

Figure 1 - Screenshot of the data that will be prepended to an encrypted file. This data will contain an AES key that can be used to decrypt the file, as well as the full path of the file. This block will be encrypted via the hard-coded RSA key before it is prepended to the newly encrypted files. The ransomware will generate a new AES key for each file it encrypts.

Figure 2 - Screenshot of data after it is encrypted using the malware's hard-coded RSA key.

Figure 2 - Screenshot of data after it is encrypted using the malware's hard-coded RSA key.

Figure 3 - Screenshot of the header of an encrypted file after the encrypted AES key and the full path of the file data is appended.

Figure 3 - Screenshot of the header of an encrypted file after the encrypted AES key and the full path of the file data is appended.

Figure 4 - The ransomware enumerating all drives attached to the target system.

Figure 4 - The ransomware enumerating all drives attached to the target system.

Figure 5 - The ransomware writing the ransom note "readme.txt" to a directory after it encrypts contents of a directory.

Figure 5 - The ransomware writing the ransom note "readme.txt" to a directory after it encrypts contents of a directory.

Figure 6 - The ransomware deleting the "msupdate" service after encryption of the target system's files complete.

Figure 6 - The ransomware deleting the "msupdate" service after encryption of the target system's files complete.

konedieyp[@]airmail.cc

Tags

ransomware

Details
Address konedieyp[@]airmail.cc
Relationships
konedieyp[@]airmail.cc Related_To 2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff
konedieyp[@]airmail.cc Related_To fdec933ca1dd1387d970eeea32ce5d1f87940dfb6a403ab5fc149813726cbd65
konedieyp[@]airmail.cc Related_To 027119161d11ba87acc908a1d284b93a6bcafccc012e52ce390ecb9cd745bf27
konedieyp[@]airmail.cc Related_To e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6
konedieyp[@]airmail.cc Related_To feb3e6d30ba573ba23f3bd1291ca173b7879706d1fe039c34d53a4fdcdf33ede
konedieyp[@]airmail.cc Related_To 10bce0ff6597f347c3cca8363b7c81a8bff52d2ff81245cd1e66a6e11aeb25da
Description

The DearCry ransomware samples contain this email address in the ransom note as a contact for decrypting files.

uenwonken[@]memail.com

Tags

ransomware

Details
Address uenwonken[@]memail.com
Relationships
uenwonken[@]memail.com Related_To 2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff
uenwonken[@]memail.com Related_To fdec933ca1dd1387d970eeea32ce5d1f87940dfb6a403ab5fc149813726cbd65
uenwonken[@]memail.com Related_To 027119161d11ba87acc908a1d284b93a6bcafccc012e52ce390ecb9cd745bf27
uenwonken[@]memail.com Related_To e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6
uenwonken[@]memail.com Related_To feb3e6d30ba573ba23f3bd1291ca173b7879706d1fe039c34d53a4fdcdf33ede
uenwonken[@]memail.com Related_To 10bce0ff6597f347c3cca8363b7c81a8bff52d2ff81245cd1e66a6e11aeb25da
Description

The DearCry ransomware samples contain this email address in the ransom note as a contact for decrypting files.

fdec933ca1dd1387d970eeea32ce5d1f87940dfb6a403ab5fc149813726cbd65

Tags

ransomwaretrojan

Details
Name fdec933ca1dd1387d970eeea32ce5d1f87940dfb6a403ab5fc149813726cbd65
Size 1322521 bytes
Type PE32 executable (console) Intel 80386, for MS Windows
MD5 6be28a4523984698e7154671f73361bf
SHA1 b974375ef0f6dcb6ce30558df2ed8570bf1ad642
SHA256 fdec933ca1dd1387d970eeea32ce5d1f87940dfb6a403ab5fc149813726cbd65
SHA512 c3a44431e8cbb76d75ea2a1caca6fe77dfbd2a9565da918620433d415d396c08394ecb1c6454fc69661d61683711e53b60a69435e25518a04e81c20136f62f20
ssdeep 24576:C5Nv2SkWFP/529IC8u2bAs0NIzkQS+KpPbEasBY2iKDl1fpxkLVZgMCST:oB70s9yjE62iIl1fpxkLVZgMCA
Entropy 6.994288
Antivirus
Ahnlab Ransomware/Win.DoejoCrypt
Antiy Trojan[Ransom]/Win32.Encoder
Avira TR/AD.DearcryRansom.dneew
BitDefender Gen:Heur.Mint.Zard.46
ClamAV Win.Ransomware.Dearcry-9840778-0
Comodo Malware
Cyren W32/Ransom.TNVJ-5084
ESET a variant of Win32/Filecoder.DearCry.A trojan
Emsisoft Gen:Heur.Mint.Zard.46 (B)
Ikarus Trojan-Ransom.FileCrypter
K7 Trojan ( 005790ee1 )
Lavasoft Gen:Heur.Mint.Zard.46
McAfee Ransom-DearCry!6BE28A452398
Microsoft Security Essentials Ransom:Win32/DoejoCrypt.A
NANOAV Trojan.Win32.Encoder.ioxcpd
Quick Heal Ransom.DearCry.S19261705
Sophos Troj/Ransom-GFE
Symantec Ransom.Dearcry
Systweak trojan-ransom.dearcry
TACHYON Ransom/W32.DearCry.1322521
TrendMicro Ransom.53933CA6
TrendMicro House Call Ransom.53933CA6
Vir.IT eXplorer Ransom.Win32.DearCry.CUQ
VirusBlokAda TrojanRansom.Encoder
Zillya! Trojan.Filecoder.Win32.18026
YARA Rules
  • rule CISA_10330097_01 : trojan downloader ransomware DEARCRY
    {
       meta:
           Author = "CISA Code & Media Analysis"
           Incident = "10330097"
           Date = "2021-03-31"
           Last_Modified = "20210331_1630"
           Actor = "n/a"
           Category = "Trojan Downloader Ransomware"
           Family = "DEARCRY"
           Description = "Detects DearCry Ransomware"
           MD5_1 = "0e55ead3b8fd305d9a54f78c7b56741a"
           SHA256_1 = "2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff"
           MD5_2 = "cdda3913408c4c46a6c575421485fa5b"
           SHA256_2 = "e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6"
           MD5_3 = "c6eeb14485d93f4e30fb79f3a57518fc"
           SHA256_3 = "feb3e6d30ba573ba23f3bd1291ca173b7879706d1fe039c34d53a4fdcdf33ede"
       strings:
           $s0 = { 8B 85 04 EA FF FF 50 8B 8D 08 EA FF FF 51 8B 55 14 52 8B 45 10 50 8D 8D 68 F0 FF FF 51 8B 95 00 EA FF FF 52 }
           $s1 = { 43 72 79 70 74 6F 50 72 6F 2D 58 63 68 42 }
           $s2 = "-----BEGIN RSA PUBLIC KEY-----"
           $s3 = ".CRYPT"
       condition:
           all of them
    }
ssdeep Matches

No matches found.

PE Metadata
Compile Date 2021-03-08 01:29:05-05:00
Import Hash f8b8e20e844ccd50a8eb73c2fca3626d
PE Sections
MD5 Name Raw Size Entropy
19c89970662b40d47561bb17377abe08 header 1024 2.591397
07abe3c7ee0a03e132be7d8e50cb59b3 .text 976896 7.069141
7133c887704081b6d3678f691a6754fe .rdata 265728 6.128972
bef1589c6181fa392609e904f4410443 .data 26112 4.707707
a0bf446401bdd255b7f7cb0215177d73 .rsrc 512 5.108717
f3d5e7499f330d470ed5e0dd856b599c .reloc 51712 5.474130
Packers/Compilers/Cryptors
Microsoft Visual C++ ?.?
Relationships
fdec933ca1... Related_To konedieyp[@]airmail.cc
fdec933ca1... Related_To uenwonken[@]memail.com
Description

This file is a malicious 32-bit Windows executable. It has been identified as a variant of the DearCry ransomware and is similar in design and functionality to the file 2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff. The hard-coded RSA key contained within this binary is illustrated below.

--Begin RSA public key--
MIIBCAKCAQEA5+mVBe75OvCzCW4oZHl7vqPwV2O4kgzgfp9odcL9LZc8Gy2+NJPDwrHbttKI3z4Yt3G04lX7bEp1RZjxUYfzX8qvaPC2EBduOjSN1WMSbJJrINs1IzkqXRrggJhSbp881Jr6NmpE6pns0Vfv//Hk1idHhxsXg6QKtfXlzAnRbgA1WepSDJq5H08WGFBZrgUVM0zBYI3JJH3b9jIRMVQMJUQ57w3jZpOnpFXSZoUy1YD7Y3Cu+n/Q6cEft6t29/FQgacXmeA2ajb7ssSbSntBpTpoyGc/kKoaihYPrHtNRhkMcZQayy5aXTgYtEjhzJAC+esXiTYqklWMXJS1EmUpoQIBAw==
--End RSA public key--

This ransomware provides the following ransom note within directories of encrypted files on the target system and shared drives:

--Begin ransom note--
Your file has been encrypted!
                        If you want to decrypt, please contact us.
                        konedieyp[@]airmail.cc or uenwonken[@]memail.com
                        And please send me the following hash!
                        d37fc1eabc6783a418d23a8d2ba5db5a
--End ransom note--

027119161d11ba87acc908a1d284b93a6bcafccc012e52ce390ecb9cd745bf27

Tags

ransomwaretrojan

Details
Name 027119161d11ba87acc908a1d284b93a6bcafccc012e52ce390ecb9cd745bf27
Size 1322496 bytes
Type PE32 executable (console) Intel 80386, for MS Windows
MD5 a7e571312e05d547936aab18f0b30fbf
SHA1 e0d643e759b2adf736b451aff9afa92811ab8a99
SHA256 027119161d11ba87acc908a1d284b93a6bcafccc012e52ce390ecb9cd745bf27
SHA512 20e8af2770aa1be935f7d1b74d6db6f9aeb5aebab016ac6c2e58e60b1b5c9029726fda7b75ed003bf4a1a5a480024231c6a90f5a3d812bf2438dc2c540a49f88
ssdeep 24576:C5Nv2SkWFP/529IC8u2bAs0NIzkQS+KpPbEasBY2iKDl1fpxkLVZgMCSZ:oB70s9yjE62iIl1fpxkLVZgMCk
Entropy 6.994270
Antivirus
Ahnlab Ransomware/Win.DoejoCrypt
Avira TR/AD.DearcryRansom.dneew
BitDefender Gen:Heur.Mint.Zard.46
ClamAV Win.Ransomware.Dearcry-9840778-0
Comodo Malware
Cyren W32/Trojan.UHTA-2594
ESET a variant of Win32/Filecoder.DearCry.A trojan
Emsisoft Gen:Heur.Mint.Zard.46 (B)
Ikarus Trojan-Ransom.FileCrypter
K7 Trojan ( 005790ee1 )
Lavasoft Gen:Heur.Mint.Zard.46
McAfee Ransom-DearCry!A7E571312E05
Microsoft Security Essentials Ransom:Win32/DoejoCrypt.A
NANOAV Trojan.Win32.Encoder.ioxcpd
Quick Heal Ransom.DearCry.S19261705
Sophos Troj/Ransom-GFE
Symantec Unavailable (production)
Systweak trojan-ransom.dearcry
TACHYON Ransom/W32.DearCry.1322496
TrendMicro Ransom.FC206072
TrendMicro House Call Ransom.FC206072
Vir.IT eXplorer Ransom.Win32.DearCry.CUQ
VirusBlokAda TrojanRansom.Encoder
Zillya! Trojan.Filecoder.Win32.18026
YARA Rules
  • rule CISA_10330097_01 : trojan downloader ransomware DEARCRY
    {
       meta:
           Author = "CISA Code & Media Analysis"
           Incident = "10330097"
           Date = "2021-03-31"
           Last_Modified = "20210331_1630"
           Actor = "n/a"
           Category = "Trojan Downloader Ransomware"
           Family = "DEARCRY"
           Description = "Detects DearCry Ransomware"
           MD5_1 = "0e55ead3b8fd305d9a54f78c7b56741a"
           SHA256_1 = "2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff"
           MD5_2 = "cdda3913408c4c46a6c575421485fa5b"
           SHA256_2 = "e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6"
           MD5_3 = "c6eeb14485d93f4e30fb79f3a57518fc"
           SHA256_3 = "feb3e6d30ba573ba23f3bd1291ca173b7879706d1fe039c34d53a4fdcdf33ede"
       strings:
           $s0 = { 8B 85 04 EA FF FF 50 8B 8D 08 EA FF FF 51 8B 55 14 52 8B 45 10 50 8D 8D 68 F0 FF FF 51 8B 95 00 EA FF FF 52 }
           $s1 = { 43 72 79 70 74 6F 50 72 6F 2D 58 63 68 42 }
           $s2 = "-----BEGIN RSA PUBLIC KEY-----"
           $s3 = ".CRYPT"
       condition:
           all of them
    }
ssdeep Matches

No matches found.

PE Metadata
Compile Date 2021-03-08 01:29:05-05:00
Import Hash f8b8e20e844ccd50a8eb73c2fca3626d
PE Sections
MD5 Name Raw Size Entropy
19c89970662b40d47561bb17377abe08 header 1024 2.591397
07abe3c7ee0a03e132be7d8e50cb59b3 .text 976896 7.069141
7133c887704081b6d3678f691a6754fe .rdata 265728 6.128972
bef1589c6181fa392609e904f4410443 .data 26112 4.707707
a0bf446401bdd255b7f7cb0215177d73 .rsrc 512 5.108717
f3d5e7499f330d470ed5e0dd856b599c .reloc 51712 5.474130
Packers/Compilers/Cryptors
Microsoft Visual C++ ?.?
Relationships
027119161d... Related_To konedieyp[@]airmail.cc
027119161d... Related_To uenwonken[@]memail.com
Description

This file is a malicious 32-bit Windows executable. It has been identified as a variant of the DearCry ransomware and is similar in design and functionality to the file 2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff. The hard-coded RSA key contained within this binary is illustrated below.

--Begin RSA public key--
MIIBCAKCAQEA5+mVBe75OvCzCW4oZHl7vqPwV2O4kgzgfp9odcL9LZc8Gy2+NJPDwrHbttKI3z4Yt3G04lX7bEp1RZjxUYfzX8qvaPC2EBduOjSN1WMSbJJrINs1IzkqXRrggJhSbp881Jr6NmpE6pns0Vfv//Hk1idHhxsXg6QKtfXlzAnRbgA1WepSDJq5H08WGFBZrgUVM0zBYI3JJH3b9jIRMVQMJUQ57w3jZpOnpFXSZoUy1YD7Y3Cu+n/Q6cEft6t29/FQgacXmeA2ajb7ssSbSntBpTpoyGc/kKoaihYPrHtNRhkMcZQayy5aXTgYtEjhzJAC+esXiTYqklWMXJS1EmUpoQIBAw==
--End RSA public key--

This ransomware provides the following ransom note within directories of encrypted files on the target system and shared drives:

--Begin ransom note--
Your file has been encrypted!
                        If you want to decrypt, please contact us.
                        konedieyp[@]airmail.cc or uenwonken[@]memail.com
                        And please send me the following hash!
                        d37fc1eabc6783a418d23a8d2ba5db5a
--End ransom note--

e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6

Tags

downloaderloaderransomwaretrojan

Details
Name e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6
Size 1322496 bytes
Type PE32 executable (console) Intel 80386, for MS Windows
MD5 cdda3913408c4c46a6c575421485fa5b
SHA1 56eec7392297e7301159094d7e461a696fe5b90f
SHA256 e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6
SHA512 666b7419adaa2fba34e53416fc29cac92bbbe36d9fae57bae00001d644f35484df9b1e44a516866b000b8ab04cd2241414fe0692e1a5b6f36d540ed13a45448a
ssdeep 24576:C5Nv2SkWFP/529IC8u2bAs0NIzkQS+KpPbEasBY2iKDl1fpxkLVZgMCS+:oB70s9yjE62iIl1fpxkLVZgMC3
Entropy 6.994272
Antivirus
Ahnlab Ransomware/Win.DoejoCrypt
Antiy Trojan[Ransom]/Win32.Encoder
Avira TR/AD.DearcryRansom.dneew
BitDefender Gen:Heur.Mint.Zard.46
ClamAV Win.Ransomware.Dearcry-9840778-0
Comodo Malware
Cyren W32/Trojan.UHSB-2594
ESET a variant of Win32/Filecoder.DearCry.A trojan
Emsisoft Gen:Heur.Mint.SP.Ransom.Dearcry.1 (B)
Ikarus Trojan-Ransom.FileCrypter
K7 Trojan ( 005790ee1 )
Lavasoft Gen:Heur.Mint.SP.Ransom.Dearcry.1
McAfee Ransom-DearCry!CDDA3913408C
Microsoft Security Essentials Ransom:Win32/DoejoCrypt.A
NANOAV Trojan.Win32.Encoder.ioxcpd
Quick Heal Ransom.DearCry.S19261705
Sophos Troj/Ransom-GFE
Symantec Downloader
TACHYON Ransom/W32.DearCry.1322496
TrendMicro Ransom.56DC2A23
TrendMicro House Call Ransom.56DC2A23
Vir.IT eXplorer Ransom.Win32.DearCry.CUQ
VirusBlokAda TrojanRansom.Encoder
Zillya! Trojan.Filecoder.Win32.18026
YARA Rules
  • rule CISA_10330097_01 : trojan downloader ransomware DEARCRY
    {
       meta:
           Author = "CISA Code & Media Analysis"
           Incident = "10330097"
           Date = "2021-03-31"
           Last_Modified = "20210331_1630"
           Actor = "n/a"
           Category = "Trojan Downloader Ransomware"
           Family = "DEARCRY"
           Description = "Detects DearCry Ransomware"
           MD5_1 = "0e55ead3b8fd305d9a54f78c7b56741a"
           SHA256_1 = "2b9838da7edb0decd32b086e47a31e8f5733b5981ad8247a2f9508e232589bff"
           MD5_2 = "cdda3913408c4c46a6c575421485fa5b"
           SHA256_2 = "e044d9f2d0f1260c3f4a543a1e67f33fcac265be114a1b135fd575b860d2b8c6"
           MD5_3 = "c6eeb14485d93f4e30fb79f3a57518fc"
           SHA256_3 = "feb3e6d30ba573ba23f3bd1291ca173b7879706d1fe039c34d53a4fdcdf33ede"
       strings:
           $s0 = { 8B 85 04 EA FF FF 50 8B 8D 08 EA FF FF 51 8B 55 14 52 8B 45 10 50 8D 8D 68 F0 FF FF 51 8B 95 00 EA FF FF 52 }
           $s1 = { 43 72 79 70 74 6F 50 72 6F 2D 58 63 68 42 }
           $s2 = "-----BEGIN RSA PUBLIC KEY-----"
           $s3 = ".CRYPT"
       condition:
           all of them
    }
ssdeep Matches

No matches found.

PE Metadata
Compile Date 2021-03-08 01:29:05-05:00
Import Hash f8b8e20e844ccd50a8eb73c2fca3626d
PE Sections
MD5 Name Raw Size Entropy
19c89970662b40d47561bb17377abe08 header 1024 2.591397
07abe3c7ee0a03e132be7d8e50cb59b3 .text 976896 7.069141
7133c887704081b6d3678f691a6754fe .rdata 265728 6.128972
bef1589c6181fa392609e904f4410443 .data 26112 4.707707
a0bf446401bdd255b7f7cb0215177d73 .rsrc 512 5.108717
f3d5e7499f330d470ed5e0dd856b599c .reloc 51712 5.474130
Packers/Compilers/Cryptors
Microsoft Visual C++ ?.?
Relationships
e044d9f2d0... Related_To konedieyp[@]airmail.cc
e044d9f2d0... Related_To uenwonken[@]memail.com
Description

This file is a malicious 32-bit Windows executable. It has been identified as a variant of the DearCry ransom