The Evolution of Gandcrab Ransomware

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The Evolution of GandCrab Ransomware Tamas Boczan @tamas_boczan Sr. Threat Analyst Why? Why? Why? Business Model: RaaS Panel for Affiliates Mass Delivery Methods • Email attachments - Javascript - Doc - Encrypted doc • Drive- by download Delivery: RDP, Exploits Payload: Starting Point Data collection • System Info • External IP • AV? Payload: Starting Point Data collection Connect Home • System Info • nslookup • External IP • AV? Payload: Starting Point Data collection Connect Home Preparation • System Info • nslookup • Kill Processes • External IP • AV? Payload: Starting Point Data collection Connect Home Preparation Encryption • System Info • nslookup • Kill Processes • AES • External IP • *.GDCB • AV? Payload: Starting Point Data collection Connect Home Preparation Encryption Post-Infection • System Info • nslookup • Kill Processes • AES • Shadow Copies • External IP • *.GDCB • AV? Feb 28: Europol decryptor Data collection Connect Home Preparation Encryption Post-Infection • System Info • nslookup • Kill Processes • AES • Shadow Copies • External IP • *.GDCB • AV? 7 days later: v2 Data collection Connect Home Preparation Encryption Post-Infection • System Info • nslookup • Kill Processes • AES • Shadow Copies • External IP • *.CRAB • AV? • Kernel-AV 7 weeks later: v3 Post-Infection • Shadow Copies • Wallpaper v4 Data collection Connect Home Preparation Encryption Post-Infection • System Info • nslookup • Kill Processes • AES • Shadow Copies • External IP • Salsa • Wallpaper • AV? • *.KRAB • Self-removal • SMB shares v4.1 Data collection Connect Home Preparation Encryption Post-Infection • System Info • WPress hacks • Kill Processes • Salsa • Shadow Copies • AV? • URL generation • *.KRAB • Wallpaper • SMB shares • Self-removal Vaccine: Jul 13 4 d 2d 1d Zero day details 4 d 2d 1d 13 d • BSOD, no RCE • Full disclosure, not used • Why? - Retaliation - Overestimated impact • Probably just fuzzed it v5 Data collection Connect Home Preparation Encryption Post-Infection • System Info • WPress hacks • Kill Processes • Salsa • Shadow Copies • AV? • URL generation • Escalate • *.{Random} • Wallpaper • SMB shares • Self-removal v5: Maintenance Data collection Connect Home Preparation Encryption Post-Infection • System Info • WPress hacks • Kill Processes • Salsa • Shadow Copies • AV? • URL generation • Escalate • *.{Random} • Wallpaper • SMB shares • Self-removal Retired? What We Learned: Developer’s Profile • > RaaS marketing skills • Project organization: > react quickly < poor quality • Exploit development capability: > implement exploits based on POCs > find simple exploit via fuzzing < can’t develop more complex RCE exploit < can’t guess impact of an exploit The Evolution of GandCrab Ransomware Tamas Boczan @tamas_boczan Sr. Threat Analyst.

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