Rewterz Threat Alert – REvil Ransomware – Active IOCs

Severity

High

Analysis Summary

The REvil (also known as Sodinokibi) is a Ransomware-as-a-Service (RaaS). The first attack of REvil in middle of April 2019, and attracted huge attention span from the InfoSec world due to their uncanny similarities with GandCrab Ransomware. The group uses different distribution techniques of deploying ransomware such as exploit kits, scans and exploiting various vulnerable software (Oracle WebLogic), RDP servers, and backdoored software installers. Revil has made estimated over $100 million by infecting large business owners and they threaten to publish data if the ransom money is not paid by the victim. 

The ransom note placed by REvil (Source: Elliptic)

Impact

• File Encryption

Indicators of Compromise

MD5

• f3a39aeb83cff993d7e0b318e2b27115

SHA-256

• 7446ab019d4f874c771c2d4274951aae1a8a4ee9f779148259ce6661c50312ad

SHA-1

• 9fe12e22afca6f52aaa732f3a937cd615a56b8b3

Remediation

• Block all threat indicators at your respective controls.
• Search for Indicator of compromise (IOCs) in your environment utilizing your respective security controls.
• Maintain cyber hygiene by updating your anti-virus software and implement patch management lifecycle.
• Maintain Offline Backups – In a ransomware attack, the adversary will often delete or encrypt backups if they have access to them. That’s why it’s important to keep offline (preferably off-site), encrypted backups of data and test them regularly.
• Emails from unknown senders should always be treated with caution.
• Never trust or open ” links and attachments received from unknown sources/senders.