Rewterz Threat Alert – GandCrab or .CRAB Ransomware – Active IOCs

Severity

High

Analysis Summary

GandCrab – a ransomware-as-a-service variant – was discovered in early 2018. At least five versions of GandCrab have been created since its discovery. GandCrab ransomware encrypts victims’ files and demands ransom money in exchange for decryption keys. GandCrab targets organizations and individuals that use Microsoft Windows-powered PCs. This ransomware has attacked a huge number of systems in India, Chile, Peru, the United States, and the Philippines. This ransomware has been linked to some of the most notorious ransomware outbreaks, resulting in enormous financial losses for victims. To effectively victimize the target, its operators frequently try to imitate reputable services. In January 2020, for example, GandCrab was transmitted in a word document labeled “Flu pandemic warning.doc” that purportedly came from the Centers for Disease Control. The virus is assigned various name by different antivirus software including Trojan.Ransom.GandCrab, Win32/Filecoder.GandCrab, Ransom: Win32/GandCrab, and others

Impact

• Files Encryption

Indicators of Compromise

MD5

• b44561842093626ec494ca0d3a56889b
• bface344d14f9503aab7e59a99db6124
• 4dfa941739ff5c267041506ae6f4f9cf

SHA-256

• 686cc963f386996e67a673348f5f1e300445d6e51987765b2f8fc4b11ba08426
• 1e754e1c7e081ae1e7701ba45c80ca4156d41d958158384a368047f3a6921044
• 61bf467261d1d97452e48f1c87e7f52dab654c8932501c29734730aff09a9603

SHA-1

• 1e5854883092e00cda03d20c4073c7b9fa95eea0
• 9d4e54f418f78ff7f068aeb80e6fa6dc1ac174d2
• 2b643fe75e442a64c8e47f38d7d9cd70e212e7ca

Remediation

• Block all threat indicators at your respective controls.
• Search for Indicators of compromise (IOCs) in your environment utilizing your respective security controls
• Maintain cyber hygiene by updating your anti-virus software and implementing a 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.
• Patch and upgrade any platforms and software timely and make it into a standard security policy. Prioritize patching known exploited vulnerabilities and zero-days.
• Along with network and system hardening, code hardening should be implemented within the organization so that their websites and software are secure. Use testing tools to detect any vulnerabilities in the deployed codes.
• Enable antivirus and anti-malware software and update signature definitions in a timely manner. Using multi-layered protection is necessary to secure vulnerable assets