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Cl0p, also known as Clop, is a ransomware family derived from CryptoMix that emerged in February 2019. It encrypts victim files using symmetric and asymmetric cryptography, with documented use of AES, RC4, and RSA, and leaves ransom demands. It targets Windows systems and includes language, keyboard, or geographic checks intended to avoid systems associated with Commonwealth of Independent States countries. Cl0p has been deployed through ransomware-as-a-service arrangements and is associated with TA505 and FIN11; FIN7 has also deployed it.
Cl0p infection chains have included large-scale spearphishing campaigns using malicious documents and intermediate downloaders or remote-access malware. Truebot and Raspberry Robin have also been associated with delivery chains leading to Cl0p. Operators additionally exploit vulnerable internet-facing applications and obtain compromised network access from initial access brokers. Victims include large organizations worldwide, particularly in financial services, manufacturing, healthcare, and education.
The associated Cl0p extortion operation combines ransomware deployment with data theft and threats of public disclosure. Its major campaigns against Accellion File Transfer Appliance, GoAnywhere MFT, and MOVEit Transfer relied on data theft and extortion without deploying the Cl0p encryption payload. These campaigns used compromised file-transfer applications and web shells to collect sensitive organizational data. The MOVEit campaign exploited CVE-2023-34362 and deployed LEMURLOOT. Operators publish stolen information and contact victims' executives, customers, and partners to increase payment pressure.
Mallory pivots from this family to the IOCs, detections, and named campaigns that touch your stack, and pages you when something new lands.
16 CVEs Mallory has correlated with this family across public research and vendor advisories. Each row links to the full Mallory page for that vulnerability.
In its discussion of Clop infrastructure, the report identifies IP address 45.227.253[.]147 as related to the previous massive exploitation of MOVEit zero-day CVE-2023-34362 and states that the address belongs to Alviva Holding Limited. | This domain appears in a ransom note of a Clop payload.
The threat actors successfully uploaded a WAR archive that housed a WebShell and various payloads into the webroot of the SysAid Tomcat web service by exploiting the SysAid CVE-2023-47246 Path Traversal vulnerability. | Microsoft posted a tweet highlighting the exploitation of this vulnerability in CL0P ransomware and strongly recommends system updates.
Emerging in early 2019, CL0P was first introduced as a more advanced version of its predecessor the ‘CryptoMix’ ransomware.
Emerging in early 2019, CL0P was first introduced as a more advanced version of its predecessor the ‘CryptoMix’ ransomware.
Emerging in early 2019, CL0P was first introduced as a more advanced version of its predecessor the ‘CryptoMix’ ransomware.
Emerging in early 2019, CL0P was first introduced as a more advanced version of its predecessor the ‘CryptoMix’ ransomware.
Emerging in early 2019, CL0P was first introduced as a more advanced version of its predecessor the ‘CryptoMix’ ransomware.
Its most characteristic ransomware, also called Clop or Cl0p, is a variant of the CryptoMix family.
Watchtowr reports CVE-2025-61882 and CVE-2025-61884 were exploited in the recent wave of Cl0p data theft attacks and subsequent extortion campaign.
Watchtowr reports CVE-2025-61882 and CVE-2025-61884 were exploited in the recent wave of Cl0p data theft attacks and subsequent extortion campaign.
CVE-2026-12569 (CVSS score of 9.3) is a critical remote code execution (RCE) vulnerability in PTC Windchill PDMlink and PTC FlexPLM. An attacker can exploit this vulnerability through the deserialization of untrusted data.
The e-crime group was previously observed dropping DEWMODE and LEMURLOOT after exploiting SQL injection flaws in Accellion (CVE-2021-27101) and MOVEit Transfer (CVE-2023-34362) file transfer software, respectively. | An advisory released by Ransom-ISAC along with eCrime.ch and Defused last month attributed the malicious activity to the Clop (aka Cl0p) ransomware operation, with the threat actor dropping JSP web shells against susceptible systems.
Для CVE-2024-50623 (unrestricted file upload в Cleo Harmony/VLTrader/LexiCom, CVSS 9.8, CWE-434) - обратная история: на Exploit-DB записи нет до сих пор, зато на GitHub с декабря 2024 лежит PoC от watchtowrlabs... CVE-2024-50623 сидит в CISA KEV с 13 декабря 2024... Та же CVE-2024-50623, через которую Clop атаковала файловые трансферы Cleo, имела EPSS 0.9861...
Exploiting zero-day vulnerabilities in an FTA product (CVE-2021-27101, CVE-2021-27102, CVE-2021-27103, and CVE-2021-27104) | Having defined the phases, we now home in on the three ransomware families in question: REvil, Clop, and Conti.
Exploiting zero-day vulnerabilities in an FTA product (CVE-2021-27101, CVE-2021-27102, CVE-2021-27103, and CVE-2021-27104) | Having defined the phases, we now home in on the three ransomware families in question: REvil, Clop, and Conti.
Exploiting zero-day vulnerabilities in an FTA product (CVE-2021-27101, CVE-2021-27102, CVE-2021-27103, and CVE-2021-27104) | Having defined the phases, we now home in on the three ransomware families in question: REvil, Clop, and Conti.
12 distinct threat actors attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.
Clop can encrypt files using AES, RSA, and RC4 and will add the ".clop" extension to encrypted files.
FIN7 has been observed deploying Cl0p (aka Clop) ransomware, marking the threat actor's first ransomware campaign since late 2021.
Its most characteristic ransomware, also called Clop or Cl0p, is a variant of the CryptoMix family.
Emerging in early 2019, CL0P was first introduced as a more advanced version of its predecessor the ‘CryptoMix’ ransomware.
ShadowSyndicate "had been associated with the ALPHV/BlackCat, Cl0p, Royal, Play, Cactus, Nokoyawa, and Quantum ransomware operations."
Les hackers de ShinyHunters ont récemment compromis l'infrastructure du gang de ransomwares Cl0p.
23 distinct techniques documented for this family, organized by ATT&CK tactic.
Cl0p's signature move is mass exploitation of enterprise software... exploiting zero-day vulnerabilities in widely used enterprise file-transfer and business software. Storm-1175 is also described as exploiting newly disclosed vulnerabilities in GoAnywhere MFT, SmarterMail, and Ivanti Connect Secure.
491 indicators attributed across vendor reports, sandbox runs, and researcher write-ups. Full values are available in Mallory.
IPs, domains, and DNS infrastructure linked to this family.
File hashes (MD5, SHA-1, SHA-256) from samples and reports.
Other indicator types observed in public reporting.
200 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Mentioned in background reporting about conflict between cybercriminal groups. The described incident concerns the operator's leak site, not deployment or technical behavior of the ransomware.
Ransomware/extortion operation described as applying pressure through direct email warnings to affected victims about data leaks.
Le loader inclut des restrictions de ciblage (pas de pays CIS, pas de secteur public), pratique courante dans les malwares du nexus russe (LockBit, Qilin, Cl0p, Medusa).
Ransomware group/family whose infrastructure was reportedly compromised by ShinyHunters; it is not the primary subject of the reference.
Match every observed IP, domain, and hash against your live telemetry.
Named campaigns wielding this family, with evidence pinned to each claim.
CVEs this family uses for access and lateral movement.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Every documented technique, ranked by evidence weight.
Reddit, Mastodon, and CTI community discussion around this family.