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August 15, 2022Rewterz Threat Alert – Donot APT Group – Active IOCs
August 15, 2022Severity
High
Analysis Summary
Virlock is a file-infecting ransomware that was initially found in 2014 but reappeared in 2016 and 2017. Virlock revealed new abilities with each reappearance, showing that the threat actors are continually developing and updating the malware. It showed unique capabilities in 2016 that allowed it to expand through shared apps and cloud storage. During the initial stage of its attack, this ransomware drops three instances of itself, each with its own obfuscation and persistence techniques. By altering the functionality implemented by each instance, Virlock ensures that all three instances can evade a signature-based detection system. Virlock, like other ransomware, demands payment in Bitcoin from the victim in order to decrypt their machines.
Impact
- File Encryption
Indicators of Compromise
MD5
- 68786ea216e29215ae01ad2cc50af407
SHA-256
- 2cd485f31964e269172019dd1a6fc087f01a9fcb934f3e178e8a4878932c3f6d
SHA-1
- 5eef284974d1c351b18f0b3ff6645e54e4739a9b
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.