Severity
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
- 894e2f3752d0ee54d3b66f2769d4bc6a
SHA-256
- f2a8bfad87ca97c18a21518b837744fb40d09daa6d56ef50afd206b4d13f6366
SHA-1
- 2edac3e1a748e767b30caa93365c6dc5923cf07b
Remediation
- Never open attachments or links received by unknown senders.
- Look for IOCs in your surroundings.
- At your respective controls, disable all threat indicators.