General

  • Target

    PolyBuilds_1v1.exe

  • Size

    7KB

  • Sample

    241230-q9rllsyrgv

  • MD5

    457734c0807c0ea1ec9496ee463f7601

  • SHA1

    ce5202753b348d974c369ec7bded652ffb778f57

  • SHA256

    ad4cf56d16c8f2167af4d5c09762741a325bfcb9410799d1cf7d94c16858448a

  • SHA512

    104f520f47a24add7300e5892a4c770da80dbbac9b2162b07dca4c8916ca17e12d93649bcb8f24e04f29d0659aa025b4b6d35ccc070446ad38b825ae01228015

  • SSDEEP

    96:bvAIxE61JOML7eR8zH7lRPOlkjDt/MNnoYbiMD7pV3k1Rf+p6G:E2b1Jh3zblhOwVMrpV3kDf+

Malware Config

Extracted

Family

xworm

Attributes
  • Install_directory

    %AppData%

  • install_file

    RtkAudUService64.exe

  • pastebin_url

    https://pastebin.com/raw/6ZBHT1SN

Targets

    • Target

      PolyBuilds_1v1.exe

    • Size

      7KB

    • MD5

      457734c0807c0ea1ec9496ee463f7601

    • SHA1

      ce5202753b348d974c369ec7bded652ffb778f57

    • SHA256

      ad4cf56d16c8f2167af4d5c09762741a325bfcb9410799d1cf7d94c16858448a

    • SHA512

      104f520f47a24add7300e5892a4c770da80dbbac9b2162b07dca4c8916ca17e12d93649bcb8f24e04f29d0659aa025b4b6d35ccc070446ad38b825ae01228015

    • SSDEEP

      96:bvAIxE61JOML7eR8zH7lRPOlkjDt/MNnoYbiMD7pV3k1Rf+p6G:E2b1Jh3zblhOwVMrpV3kDf+

    • Detect Xworm Payload

    • Suspicious use of NtCreateUserProcessOtherParentProcess

    • Xworm

      Xworm is a remote access trojan written in C#.

    • Xworm family

    • Downloads MZ/PE file

    • Sets service image path in registry

    • Checks BIOS information in registry

      BIOS information is often read in order to detect sandboxing environments.

    • Checks computer location settings

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

    • Executes dropped EXE

    • Indicator Removal: Clear Windows Event Logs

      Clear Windows Event Logs to hide the activity of an intrusion.

    • Command and Scripting Interpreter: PowerShell

      Using powershell.exe command.

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Legitimate hosting services abused for malware hosting/C2

    • Looks up external IP address via web service

      Uses a legitimate IP lookup service to find the infected system's external IP.

    • Writes to the Master Boot Record (MBR)

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

    • Drops file in System32 directory

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks