Rewterz Threat Alert – Chaos Ransomware – Active IOCs

Severity

High

Analysis Summary

Chaos is a customizable ransomware builder that emerged on June 9 2021 (in underground forums) by falsely marketing itself as the .NET version of Ryuk despite sharing no such overlaps with the notorious counterpart. Since then, it has undergone active development and quick advancements, which have persuaded several attacker groups to adopt it. The most recent version, known as Yashma, was observed in the wild in May 2022. Yashma allows attackers to configure the ransomware so that it does not execute dependent on the language chosen on the victim’s device. It can also disable antivirus software, backup services, storage services, remote desktop services, and credential vault services on victims’ machines. Malware developers frequently employ this strategy to avoid infecting computers in their own region, which would draw the attention of local law authorities. The Chaos ransomware generator is said to still lack some of the capabilities that are seen in many existing ransomware families.

source

Impact

• File Encryption

Indicators of Compromise

MD5

• f4f13a5e6735a9d891a242e8d2f5c57e
• 905fb6726a853b68c6d5d45f5b1bd0d5
• edaaba5a17d662d9565e57550a1e37c5

SHA-256

• 7e598e4c17cfc92223c05bab3dc60f0b6325501e58ef34090e635557f29eef44
• aa503ddb166aff5790a44dc1cf64840fb7251d2b509f7b3eeb072f59b5cc7aeb
• 1fa7c0030e8a0f71b80e37ba97408d1b3131d0c2ba4f4f50ece88d96fe175ac6

SHA-1

• bf62ceedb090e892bcd4df0f6afba562efa934c9
• 1549520335fac63de592a3cd6e28f8a8e7386690
• 8407263b522d54df4769f016ed6eff825a84e51b

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 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.