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General

  • Target

    https://github.com/Pyran1/MalwareDatabase

  • Sample

    250306-dek45axjw2

Malware Config

Extracted

Family

cryptbot

C2

nkoopw11.top

moraass08.top

Targets

    • CryptBot

      CryptBot is a C++ stealer distributed widely in bundle with other software.

    • CryptBot payload

    • Cryptbot family

    • Detection for the Linux version of Sysjoker cross-platform backdoor

    • Detection for the macOS version of Sysjoker cross-platform backdoor

    • Detection for the windows version of Sysjoker cross-platform backdoor

    • Modifies visibility of file extensions in Explorer

    • SysJoker

      SysJoker is a cross-platform backdoor first seen in late 2021.

    • Sysjoker family

    • Xmrig family

    • xmrig

      XMRig is a high performance, open source, cross platform CPU/GPU miner.

    • XMRig Miner payload

    • Manipulates Digital Signatures

      Attackers can apply techniques such as changing the registry keys of authenticode & Cryptography to obtain their binary as valid.

    • Checks computer location settings

      Looks up country code configured in the registry, likely geofence.

    • Executes dropped EXE

    • Reads user/profile data of web browsers

      Infostealers often target stored browser data, which can include saved credentials etc.

    • Accesses cryptocurrency files/wallets, possible credential harvesting

    • Adds Run key to start application

    • Checks installed software on the system

      Looks up Uninstall key entries in the registry to enumerate software on the system.

    • Deobfuscate/Decode Files or Information

      Payload decoded via CertUtil.

    • Legitimate hosting services abused for malware hosting/C2

    • Obfuscated Files or Information: Command Obfuscation

      Adversaries may obfuscate content during command execution to impede detection.

    • Writes to the Master Boot Record (MBR)

      Bootkits write to the MBR to gain persistence at a level below the operating system.

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks