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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.
Impact
- File Encryption
Indicators of Compromise
MD5
- 27f4f9f46b717e49706265b35741c84e
- d36637d2e08e4c001d39699cedb6248a
SHA-256
- 31c783b0211bf4b72f10b6dac6f933b7aba570ff7a8c608fd8eb46311aec0091
- dcdafe3adf1b5c07118300a1f18e82ce95137d135fa075393644bb4157a35ab0
SHA-1
- 7644144970aeb7b441de0693cf06331faaba3290
- d2b4f5326781dce97cadf039d3e58124c838cb20
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.