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

• 20363627a8aee09a1501678413544dc8
• fc8e0d444acd3d5511945f429f613ed6
• e4e9422a398fcc50af5bd7fe3b68c300

SHA-256

• f186e55feac04f6c0477e8a6c60527ac4a95c8659727b464875e8717c86ac60a
• 5e74e1376402e6587804066944f3087dbbb6b0c921df199484a9509421841601
• 6b8e57d157a7d0567aa89b96bfedc463c1b46b6c2536dcdcd57a24c84cc45d3b

SHA-1

• b39afdde4b656d0a6d462c07ebd7ee2fdfd7b544
• ebc0fa80d1c182c8fb42b9fe73609c7b1783b8e3
• 7b442c3c1610d656bb75377bbff27fed91097861

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.