Clop

攻撃者たちは悪用可能な脆弱性の情報を調べ、素早く攻撃に組み込みます。

L’objectif des attaquants est d’acquérir des droits d’administration réseau afin de faciliter le déploiement du code de chiffrement sur l’ensemble du système d’information à partir de serveurs centraux.

CL0Pなどのランサムウェア攻撃グループによって、PaperCut社の印刷管理サービス「PaperCut NG/MF」の脆弱性を悪用した攻撃が行われている

The syndicate previously executed zero-day supply chain attacks against managed file transfer platforms, including MOVEit Transfer and Accellion FTA, compromising hundreds of organizations worldwide.

Ces attaques semblent être le résultat d’une vaste campagne d’hameçonnage ayant eu lieu autour du 16 octobre 2019 et liée au groupe cybercriminel TA505.

Malicious spam emails with spear-phishing links or attachments

Once sufficient data had been collected, the attackers created scheduled tasks on a large number of systems to simultaneously start executing the Clop ransomware

TinyMet can be used to connect the reverse shell to the C&C server.

The content repeatedly describes threat actors and malware using cmd.exe, the Windows command shell, to execute commands, launch payloads, run batch files, and automate actions on compromised hosts.

The content is a MITRE ATT&CK-style listing of many malware families and threat groups using Windows/native OS APIs for execution, injection, discovery, anti-debugging, and other actions, ending with 'NtCreateProcess' and 'fork()'.

Once sufficient data had been collected, the attackers created scheduled tasks on a large number of systems to simultaneously start executing the Clop ransomware

L’objectif des attaquants est d’acquérir des droits d’administration réseau afin de faciliter le déploiement du code de chiffrement sur l’ensemble du système d’information à partir de serveurs centraux.

ADVSTORESHELL is capable of setting and deleting Registry values. Agent Tesla can achieve persistence by modifying Registry key entries. APT41 used a malware variant called GOODLUCK to modify the registry in order to steal credentials.

Once sufficient data had been collected, the attackers created scheduled tasks on a large number of systems to simultaneously start executing the Clop ransomware

L’objectif des attaquants est d’acquérir des droits d’administration réseau afin de faciliter le déploiement du code de chiffrement sur l’ensemble du système d’information à partir de serveurs centraux.

TA505 utilise un code de compression... appelé Minedoor... pour rendre ces codes malveillants plus difficiles à analyser.

TA505 uses a compression code... called Minedoor... used to compress both early stage malwares such as FlawedGrace, and final codes deployed by TA505 such as Clop or DeactivateDefender.

le rançongiciel est souvent déployé en début ou veille de week-end et comporte une fonction de suppression des copies cachés Windows (Volume Shadow copies).

Backups were either encrypted or deleted or backup disks were formatted. Shadow copies also removed

L’objectif des attaquants est d’acquérir des droits d’administration réseau afin de faciliter le déploiement du code de chiffrement sur l’ensemble du système d’information à partir de serveurs centraux.

The content is a long ATT&CK-style listing of malware and threat groups that 'decrypt', 'decode', 'deobfuscate', 'unpack', or 'decompress' payloads, strings, configuration data, shellcode, and files prior to execution or use.

Check local language via GetKeyboardLayout against hardcoded list: Georgian, Russian, Azerbaijan

Afin de s’assurer que la machine sur lequel il se trouve n’a pas déjà été chiffrée, le rançongiciel Clop vérifie la présence d’un « mutex » sur celle-ci et ne s’exécutera pas s’il est présent.

ADVSTORESHELL is capable of setting and deleting Registry values. Agent Tesla can achieve persistence by modifying Registry key entries. APT41 used a malware variant called GOODLUCK to modify the registry in order to steal credentials.

The intrusion set signs its malware by using legitimate but malicious security certificates. They often take over names of existing businesses.

des certificats sont utilisés pour signer le code malveillant Clop afin de lui donner une apparence légitime.

Tasklist can be used to discover processes running on a system. Numerous malware families and threat groups are described as listing running processes, collecting PIDs, checking for specific process names, or enumerating loaded modules.

The content is a long ATT&CK-style listing of groups and malware that can 'list files and directories,' 'search for files,' 'enumerate drives,' 'gather file metadata,' or 'browse file systems' on compromised hosts.

Cuba has used several built-in API functions for discovery like GetIpNetTable and NetShareEnum.

Check local language via GetKeyboardLayout against hardcoded list: Georgian, Russian, Azerbaijan

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.

Afin de s’assurer que la machine sur lequel il se trouve n’a pas déjà été chiffrée, le rançongiciel Clop vérifie la présence d’un « mutex » sur celle-ci et ne s’exécutera pas s’il est présent.

Ahnlab et le CERT gouvernemental sud-coréen rapportent l’usage de la porte dérobée FlawedAmmyy (parfois renommée wsus.exe) et de l’outil d’attaque Cobalt Strike lors de cette phase.

Using a script, it deploys a malware, poorly documented in open-source but until now systematically called « sage.exe » by the intrusion set, on several machines.

Threat actors exfiltrate structured databases and unencrypted files using custom web shells, demanding multi-million-dollar ransoms in exchange for non-publication.

The group sifts through a manager's files and emails, and exfiltrates data that they think might be useful in threatening, embarrassing, or putting pressure on a company's management

FlawedAmmyy ... attempts to communicate with the C&C server to download additional malware components

Cette tendance est également intéressante car elle indique que le mode opératoire est obligé d’exfiltrer des données du SI de sa victime.

This is why, in recent intrusions, a group that has often used the Clop ransomware strain has been specifically searching for workstations inside a breached company that are used by its top managers. The group sifts through a manager's files and emails, and exfiltrates data that they think might be useful in threatening, embarrassing, or putting pressure on a company's management

Terabytes of documents and files stolen from victim organizations that have not paid a data ransom are now available for download from CLOP’s deep web site

The extortion collective listed Shell on its dark web leak portal, alleging the theft of approximately 89 gigabytes of proprietary corporate data.

launch ransomware that encrypts files and servers | CLOP is one of several ransomware groups that hack into organizations, launch ransomware that encrypts files and servers, and then demand an extortion payment in return for a digital key needed to unlock access.

Rather than utilizing traditional ransomware encryption, the group frequently relies on pure extortion.

Operators can abuse the legitimate tools PC Hunter and Process Hacker to disable antimalware solutions