Cl0p (CLOP) Ransomware Group
Prolific Russian-speaking ransomware actor (Cl0p / CLOP) known since 2019 for double extortion and mass zero-day exploitation, including the 2023 MOVEit Transfer campaign.
Cl0p is a Russian-speaking ransomware group known for flash mass exploitation of zero-days — most notably the 2023 MOVEit Transfer campaign that breached hundreds of organizations through data theft and extortion.
Definition
Double-extortion ransomware gang that prefers data-theft campaigns over disk encryption alone; aggressively exploits zero-days in file-transfer and managed software before patches exist.
Why It Matters / Profile
- Sponsorship: Unattributed (Russian-speaking cybercrime)
- Active since: 2019
- Aliases: CLOP, TA505-linked (previous activity)
Current Status
- Review status: published
- Last updated: 2026-08-26
- Evidence: 2 source(s) · 4 technique(s)
- Confidence: 88%
ATT&CK Techniques
Targets
- File-transfer platforms
- Finance
- Healthcare
- Enterprise SaaS
Timeline
- 2019-01-01 — Cl0p emerged with initial ransomware operations
- 2023-05-27 — MOVEit Transfer campaign begins
- 2023-06-09 — CISA adds MOVEit CVEs to KEV
Sources
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- Evidence — assertions mapped to verifiable references.
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- Related Entities — CVE, threat actor, campaign, malware links.
- Sources — NVD, CISA KEV, MITRE ATT&CK, vendor advisories.
- Notes — your own observations and working hypotheses.
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