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

• 219273f327f5fa93167be6ea42e45065

SHA-256

• f619214b06ff85b13e6134babf5dbb9e6be52ad8c3537445065b5a567f6ff1c2

SHA-1

• 7acc95fb98bd0fe40ab67ce2758ea9bc05b166ff

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.