The suspected cyber threat actor modified several legitimate Pulse Secure files on the impacted Pulse Connect Secure appliances. See the FireEye blog post, Re-Checking Your Pulse, for more information, including activity related to actor cleanup. ![]() Security firm FireEye has posted more information on their blog, including activity related to actor clean up. Note: for context, loop 6 is the active partition and loop 8 is the rollback partition of the device. The threat actor deleted files from temp directories using "rm -f": bin/touch /tmp/data/root/bin/umount -r /tmp/data/root/bin/cpĢ. Threat actor was observed timestomping trojanized umount binary to match timestamps of legitimate binaries attempting to disguise the modifications the touch command was used to modify the time stamp :.(Updated May 27, 2021): CISA has observed the cyber threat actor performing cleanup as demonstrated by the following: For more information visit KB44764 (Customer FAQ). The investigation to date shows ongoing attempts to exploit vulnerabilities outlined in two security advisories that were patched in 20 to address previously known issues: Security Advisory SA44101 (CVE-2019-11510) and Security Advisory SA44601 (CVE- 2020- 8260). We are aware of reports that a limited number of customers have identified unusual activity on their Pulse Connect Secure (PCS) appliances. MAR-10339606-1.v1: Pulse Connect Secureįor a downloadable list of indicators of compromise (IOCs), see AA21-110A.stix.(Updated August 24, 2021): Please see CISA's new Malware Analysis Reports for analysis of malicious activity discovered on Pulse Secure Connect devices. CISA encourages organizations to review Security Advisory SA44858 and apply the necessary update. (Updated August 11, 2021): Ivanti has released Pulse Connect Secure system software version 9.1R12 to address multiple vulnerabilities that an attacker could exploit to take control of an affected system. (Updated July 21, 2021): Please see CISA's new Malware Analysis Reports in regards to adversary activity analyzed by CISA that were discovered on Pulse Connect Secure Devices. See Ivanti KB44755 - Pulse Connect Secure (PCS) Integrity Assurance for updated guidance to ensure the full integrity of your Pulse Connect Secure software. 2021): CISA has updated this alert to include new threat actor techniques, tactics, and procedures (TTPs), indicators of compromise (IOCs), and updated mitigations. CISA strongly encourages organizations using Ivanti Pulse Connect Secure appliances to immediately run the Pulse Secure Connect Integrity Tool, update to the latest software version, and investigate for malicious activity. The known webshells allow for a variety of functions, including authentication bypass, multi-factor authentication bypass, password logging, and persistence through patching. ![]() ![]() The threat actor is using this access to place webshells on the Pulse Connect Secure appliance for further access and persistence. To gain initial access, the threat actor is leveraging multiple vulnerabilities, including CVE-2019-11510, CVE-2020-8260, CVE-2020-8243, and the newly disclosed CVE-2021-22893. These entities confirmed the malicious activity after running the Pulse Secure Connect Integrity Tool. Since March 31, 2021, CISA and Ivanti have assisted multiple entities whose vulnerable Pulse Connect Secure products have been exploited by a cyber threat actor. government agencies, critical infrastructure entities, and other private sector organizations by a cyber threat actor-or actors-beginning in June 2020 or earlier related to vulnerabilities in certain Ivanti Pulse Connect Secure products. The Cybersecurity and Infrastructure Security Agency (CISA) is aware of compromises affecting a number of U.S.
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