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Cl0p is a ransomware and data-extortion operation active since 2019 and commonly associated with the TA505/FIN11 ecosystem, also tracked under names including Graceful Spider, Chubby Scorpius, and Lace Tempest. It has operated in a ransomware-as-a-service model and is notable for repeatedly exploiting high-value public-facing enterprise applications rather than relying solely on conventional malware delivery. Cl0p has targeted organizations across multiple sectors, including banking, healthcare, finance, manufacturing, automotive, aerospace, retail, and other enterprises that store sensitive operational or intellectual-property data.
Cl0p is known for both encryption-based ransomware activity and theft-led extortion. In multiple major campaigns it favored large-scale data theft and double extortion, threatening public release of stolen information even when encryption was absent or secondary. The group has been linked to exploitation of managed file transfer and enterprise application vulnerabilities, including Accellion FTA, GoAnywhere MFT, MOVEit Transfer, Oracle E-Business Suite, and in 2026 PTC Windchill and FlexPLM. In the MOVEit campaign, operators exploited CVE-2023-34362, deployed the LEMURLOOT web shell, and exfiltrated data from underlying databases. In the 2026 Windchill/FlexPLM campaign, affiliates reportedly chained a pre-authentication information-disclosure issue with CVE-2026-12569 to achieve unauthenticated remote code execution, deploy JSP web shells, enumerate filesystems, steal engineering and product-design data, and conduct extortion against affected organizations.
Observed intrusion methods attributed to Cl0p include spearphishing, exploitation of public-facing applications, and use of compromised remote access credentials such as RDP. Reported post-compromise behavior includes PowerShell and command-shell execution, web-shell persistence, privilege escalation, process injection, use of Cobalt Strike for command and control, security-tool discovery, and anti-recovery actions such as deleting shadow copies. Cl0p malware has also been reported to avoid installation on systems configured for Russian or other CIS languages and to search for antivirus and antimalware processes. The operation is widely recognized for mass exploitation campaigns against exposed enterprise software and for monetizing access through extortion centered on stolen corporate data.
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17 CVEs Mallory has correlated with this family across public research and vendor advisories. Each row links to the full Mallory page for that vulnerability.
CVEs list exploited by the Clop ransomware: CVE-2023-34362 CVE-2023-35036 CVE-2023-0669... In a new campaign launched by the threat group, they are seen exploiting GOAnywhere (MFT) using a zero-day vulnerability. | The infamous Clop ransomware, mainly known as Cl0p, targets various industries and organizations, extorting data for a considerable ransom.
November 2021: Security researchers discovered Clop ransomware exploiting the SolarWinds vulnerability, breaching several organizations. CVEs list exploited by the Clop ransomware: ... CVE-2021-35211 | The infamous Clop ransomware, mainly known as Cl0p, targets various industries and organizations, extorting data for a considerable ransom.
CVEs list exploited by the Clop ransomware: CVE-2023-34362 CVE-2023-35036 CVE-2023-0669... | The infamous Clop ransomware, mainly known as Cl0p, targets various industries and organizations, extorting data for a considerable ransom.
Clop ransomware specifically targets the MOVEIT Transfer vulnerability... The threat actors took advantage of a SQL injection vulnerability present in the web application of MOVEIT Transfer. They exploited this vulnerability by installing a webshell known as LEMURLOOT. | The infamous Clop ransomware, mainly known as Cl0p, targets various industries and organizations, extorting data for a considerable ransom.
CVEs list exploited by the Clop ransomware: CVE-2023-34362 CVE-2023-35036 CVE-2023-0669 CVE-2021-27101 CVE-2021-27102 CVE-2021-27103 CVE-2021-27104 CVE-2021-35211... In collaboration with Fin11, they exploited a zero-day vulnerability in the File Transfer Appliance (FTA) of Kiteworks (formerly known as Accellion). | The infamous Clop ransomware, mainly known as Cl0p, targets various industries and organizations, extorting data for a considerable ransom.
CVEs list exploited by the Clop ransomware: CVE-2023-34362 CVE-2023-35036 CVE-2023-0669 CVE-2021-27101 CVE-2021-27102 CVE-2021-27103 CVE-2021-27104 CVE-2021-35211... | The infamous Clop ransomware, mainly known as Cl0p, targets various industries and organizations, extorting data for a considerable ransom.
CVEs list exploited by the Clop ransomware: CVE-2023-34362 CVE-2023-35036 CVE-2023-0669 CVE-2021-27101 CVE-2021-27102 CVE-2021-27103 CVE-2021-27104 CVE-2021-35211 CVE-2021-27102 | The infamous Clop ransomware, mainly known as Cl0p, targets various industries and organizations, extorting data for a considerable ransom.
CVEs list exploited by the Clop ransomware: CVE-2023-34362 CVE-2023-35036 CVE-2023-0669 CVE-2021-27101 CVE-2021-27102 CVE-2021-27103 CVE-2021-27104 CVE-2021-35211... | The infamous Clop ransomware, mainly known as Cl0p, targets various industries and organizations, extorting data for a considerable ransom.
The Clop ransomware group is targeting internet-exposed PTC Windchill and FlexPLM instances in a new data theft extortion campaign. Clop has reportedly been exploiting a critical improper input validation vulnerability tracked as CVE-2026-12569.
Clop has reportedly been exploiting a critical improper input validation vulnerability tracked as CVE-2026-12569, which allows attackers to execute arbitrary code on vulnerable Windchill and FlexPLM instances. The flaw is described as a critical unsafe deserialization vulnerability (CVSS 9.3) affecting PTC Windchill and FlexPLM; exploitation enables unauthenticated remote code execution and JSP web shell deployment for remote command execution and sensitive product data exfiltration. | The Clop ransomware group is targeting internet-exposed PTC Windchill and FlexPLM instances in a new data theft extortion campaign. Clop has reportedly been exploiting a critical improper input validation vulnerability tracked as CVE-2026-12569.
Spoločnosť Oracle vydala bezpečnostnú aktualizáciu na svoj produkt E-Business Suite, ktorá opravuje vysoko závažnú zraniteľnosť. CVE-2025-61884 by vzdialený neautentifikovaný útočník zaslaním špeciálne vytvorených HTTP požiadaviek mohol zneužiť na kompromitáciu Oracle Configurator a získanie neoprávneného prístupu k citlivým údajom. [aktualizácia 21.10.2025] zraniteľnosť CVE-2025-61884 bola pridaná do zoznamu aktívne zneužívaných
Zraniteľnosť CVE-2024-55956 možno zneužiť na získanie neoprávneného prístupu k citlivým údajom, vykonanie neoprávnených zmien v systéme a vzdialené vykonanie kódu... V súčasnosti je dostupný Proof of Concept (PoC)... Zraniteľnosť aktívne zneužívajú útočníci minimálne od 3. decembra 2024. Ransomvérová skupina CLOP ju v rámci útokov zneužíva na krádež citlivých údajov.
The timing of the intrusion coincides with a broader hacking campaign that targeted Oracle E-Business Suite systems through a vulnerability tracked as CVE-2025-61882. Google and Mandiant researchers reported in October 2025 that the Cl0p extortion group had exploited that flaw, along with other Oracle E-Business Suite vulnerabilities, to steal data from multiple organizations in August 2025. The vulnerability allowed attackers without valid credentials to execute code remotely over HTTP on systems running Oracle E-Business Suite versions 12.2.3 through 12.2.14. Oracle issued a patch addressing CVE-2025-61882 on October 4, 2025.
A critical vulnerability in Oracle E-Business Suite (EBS), tracked as CVE-2026-46817 (CVSS 9.8), is being actively exploited in the wild. The flaw resides in the File Transmission component of Oracle Payments and allows an unauthenticated attacker with HTTP network access to take over vulnerable systems.
Oracle published a security advisory about a vulnerability (CVE-2026-35273) in PeopleSoft, specifically in the Enterprise PeopleTools, versions 8.61 and 8.62. There is credible intelligence that this vulnerability is being actively exploited in the wild, however there is no publicly available proof-of-concept (PoC).
PaperCut servers have been previously breached by ransomware gangs in 2023 by exploiting a critical, unauthenticated remote code execution (RCE) vulnerability (CVE–2023–27350)... One month later, CISA and the FBI issued a joint advisory warning that the Bl00dy Ransomware gang had also begun exploiting the CVE-2023–27350 RCE vulnerability to gain initial access to the networks of educational organizations.
PaperCut servers have been previously breached by ransomware gangs in 2023 by exploiting a critical, unauthenticated remote code execution (RCE) vulnerability (CVE–2023–27350) and a high-severity information disclosure flaw (CVE–2023–27351).
10 distinct threat actors attributed by public researchers. Open in Mallory to see the full evidence chain and overlapping campaigns.
The infamous Clop ransomware, mainly known as Cl0p, targets various industries and organizations, extorting data for a considerable ransom.
The infamous Clop ransomware, mainly known as Cl0p, targets various industries and organizations, extorting data for a considerable ransom.
Cl0p ransomware affiliates are actively exploiting this vulnerability against manufacturing, automotive, aerospace, and retail organizations.
Cl0p ransomware affiliates are exploiting exposed PTC Windchill and FlexPLM servers to steal engineering and product-design data.
the Oracle EBS platform has been under sustained, documented attack by the Cl0p ransomware group and suspected FIN11 operators throughout 2025 and into 2026
29 distinct techniques documented for this family, organized by ATT&CK tactic.
During the 2015 Ukraine Electric Power Attack, Sandworm Team modified in-registry Internet settings to lower internet security before launching rundll32.exe ... AADInternals can modify registry keys ... ADVSTORESHELL is capable of setting and deleting Registry values ... [many additional examples].
Defense Evasion: T1055 - Process Injection ... It terminates security controls present on the endpoint and employs process injection to evade detection.
Privilege Escalation: T1068 - Exploitation for Privilege Escalation ... To escalate privileges, the ransomware employs commonly exploited techniques, including UAC bypass and leveraging publicly available CVEs.
Defense Evasion: T1055 - Process Injection ... It terminates security controls present on the endpoint and employs process injection to evade detection.
Defense Evasion: T1070 - Indicator Removal ... Furthermore, it clears the event logs on the infected system.
Then by using the RC4 “master-key” the ransomware encrypts the generated RC4 key and stores it to $filename.$clop_extension.
During the 2015 Ukraine Electric Power Attack, Sandworm Team modified in-registry Internet settings to lower internet security before launching rundll32.exe ... AADInternals can modify registry keys ... ADVSTORESHELL is capable of setting and deleting Registry values ... [many additional examples].
Discovery: T1018 - Remote System Discovery The ransomware scans the endpoint for various files to encrypt and exfiltrate. It also searches for other endpoints connected to the network
Initially, the ransomware creates a new process by calling fork and exits the parent-process. The child-process sets its file mode creation mask... It then calls setsid, creates a session and sets the process group ID.
The content repeatedly describes malware and threat actors listing files and directories, enumerating drives, searching for files by extension/name/path, retrieving file metadata, and browsing file systems (for example: "APT28 has used Forfiles to locate PDF, Excel, and Word documents during collection" and "cmd can be used to find files and directories with native functionality such as dir commands").
It tries to access root by changing the working directory to “/” (chdir(“/”)). Once the permissions are set, the ransomware proceeds encrypting other directories.
Adversaries may attempt to get a listing of security software, configurations, defensive tools, and sensors that are installed on a system or in a cloud environment.
Avaddon checks for specific keyboard layouts and OS languages to avoid targeting Commonwealth of Independent States (CIS) entities... Bazar can perform a check to ensure that the operating system's keyboard and language settings are not set to Russian... Clop has checked the keyboard language using the GetKeyboardLayout() function... Ryuk has been observed to query the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Nls\Language and the value InstallLanguage.
Impact: T1486 - Data Encrypted for Impact The ransomware encrypts data using a 1024-bit RSA and RC4 key.
The earliest iteration we identified of the shared kill list was a batch script deployed alongside LockerGoga... Other iterations of the list we have observed are also hardcoded directly into the ransomware binaries.
Akira will delete system volume shadow copies via PowerShell commands. Avaddon deletes backups and shadow copies using native system tools. Babuk has the ability to delete shadow volumes using vssadmin.exe delete shadows /all /quiet. BlackCat can delete shadow copies using vssadmin.exe delete shadows /all /quiet and wmic.exe Shadowcopy Delete; it can also modify the boot loader using bcdedit /set {default} recoveryenabled No.
215 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.
Ransomware associated with encryption, data theft, and extortion against exposed AI and product-lifecycle platforms.
Ransomware family/group referenced as exploiting the MOVEit SQL injection vulnerability in mass data-theft campaigns.
Cl0p is described as a ransom/extortion group conducting data-theft and extortion operations. In this campaign it is linked to exploitation of exposed PTC Windchill/FlexPLM systems, theft of confidential data, and follow-on extortion emails using newly registered contact domains.
Ransomware used in double-extortion attacks following exploitation of the PTC Windchill/FlexPLM vulnerability chain; attackers deploy JSP web shells, steal intellectual property and product data, then deploy Cl0p and demand payment for decryption and to prevent data leaks.
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.