Rewterz Threat Alert – Virlock Ransomware – Active IOCs

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

• bd167ccbbf674f09df960a5ac22d840d

SHA-256

• ae079f19db906749279c898e18f501ce7d0a0583a8c9c30bbd70379a1e474d64

SHA-1

• 77de09eb28e2d638df947c5a925d6a07f07655b4

Remediation

• Block all threat indicators at your respective controls.
• Search for IOCs in your environment.