Severity
High
Analysis Summary
Phobos Ransomware is based on the Dharma (aka CrySIS) malware that first appeared at the beginning of 2019. It spreads into several systems via compromised Remote Desktop Protocol (RDP) connections. This malware does not use any UAC bypass methods. Unlike other cybercrime gangs that go after big hunts, Phobos creators go after smaller firms that don’t have sufficient funding to pay massive ransoms. This ransomware usually targets healthcare providers, with victims in the United States, Seychelles, Portugal, Brazil, Indonesia, Germany, Romania, and Japan. Its perpetrators demand a little ransom payment, which appeals to victims and enhances the chances of payment. The average Phobos ransom payment in July 2022 was $36,932
Phobos encrypts data & files and keeps them locked until a ransom is paid. All encrypted files are renamed with the “.phobos” extension, as well as the victim’s unique ID and email address.
ransom note
Impact
- File Encryption
- Data Exfiltration
Indicators of Compromise
MD5
- b2f083ee365141030c49ddffc325f6be
SHA-256
- 231bba5652f6fbdbab3016362fb7925fc4e4489fff5e6a4a98c37fba5bd0cfe9
SHA-1
- f1091be7e566d068403a87b0e7ed4b959c952c8e
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.
- Maintain cyber hygiene by updating your anti-virus software and implementing 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.