The US-CERT Current Activity web page is a regularly updated summary of the most frequent, high-impact types of security incidents currently being reported to the US-CERT.

RSS feed for current activities

Using CHIRP to Detect Post-Compromise Threat Activity in On-Premises Environments

CISA Hunt and Incident Response Program (CHIRP) is a new forensics collection tool that CISA developed to help network defenders find indicators of compromise (IOCs) associated with the SolarWinds and Active Directory/M365 Compromise. CHIRP is freely available on the CISA GitHub repository.

Similar to the CISA-developed Sparrow tool—which scans for signs of APT compromise within an M365 or Azure environment—CHIRP scans for signs of APT compromise within an on-premises environment.

TTP Table for Detecting APT Activity Related to SolarWinds and Active Directory/M365 Compromise

CISA has released a table of tactics, techniques, and procedures (TTPs) used by the advanced persistent threat (APT) actor involved with the recent SolarWinds and Active Directory/M365 compromise. The table uses the MITRE ATT&CK framework to identify APT TTPs and includes detection recommendations.

CISA-FBI Joint Advisory on TrickBot Malware

CISA and the Federal Bureau of Investigation (FBI) have released a Joint Cybersecurity Advisory (CSA) on TrickBot malware. A sophisticated group of cyber criminals are using phishing emails claiming to contain proof of traffic violations to lure victims into downloading TrickBot. TrickBot is a highly modular, multi-stage malware that provides its operators a full suite of tools to conduct a myriad of illegal cyber activities.

Microsoft Releases Exchange On-premises Mitigation Tool

Microsoft has released the Exchange On-premises Mitigation Tool (EOMT.ps1) that can automate portions of both the detection and patching process. Microsoft stated the following along with the release: "[the tool is intended] to help customers who do not have dedicated security or IT teams to apply these security updates. We have tested this tool across Exchange Server 2013, 2016, and 2019 deployments.

Google Releases Security Updates for Chrome

Google has released Chrome version 89.0.4389.90 for Windows, Mac, and Linux. This version addresses vulnerabilities that an attacker could exploit to take control of an affected system.

CISA encourages users and administrators to review the Chrome Release Note and apply the necessary updates.

Updates on Microsoft Exchange Server Vulnerabilities

CISA has added seven Malware Analysis Reports (MARs) to Alert AA21-062A: Mitigate Microsoft Exchange Server Vulnerabilities. Each MAR identifies a webshell associated with exploitation of the vulnerabilities in Microsoft Exchange Server products. After successful exploiting a Microsoft Exchange Server vulnerability for initial accesses, a malicious cyber actors can upload a webshell to enable remote administration of the affected system.