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
- a3749c66f65d247d8a6fae1be26d3ef9
- 7d7ee58c2696794b3be958b165eb61a9
SHA-256
- d191761ac8a7b0a3525764664609a8fccfa3732d331c525e9c1c9eb0a7068a9c
- 00b5940a6a449f17a7134c9e81b6615c5e1e2fa1eef4cf8b3952d8c6817980cf
SHA-1
- c394464bba56e62ddfe2c9073932fb656fb78b6c
- d24d3921aad182754f4ee5fa0ef13b2699d20108
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.