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General

  • Target

    downloader.exe

  • Size

    70.1MB

  • Sample

    240821-pat21sxeqh

  • MD5

    de8c4fd7ed1b7623ab3c9a4e55c17211

  • SHA1

    40f68eb4eb8194fa236f13e980d7d0940db0a9fe

  • SHA256

    192933cb274a687f0072e0db4064e4ee9080b95e303fd0ab9347760bc091e3c2

  • SHA512

    85c4bd56d6187c10baf3278de30268379b23131025e9fb6f21cf040d29c7291db6d3d1beefe0c9a7c814d932f34b0a22bf3443184f30dc4e0244eab2230c374b

  • SSDEEP

    393216:lWxQN89qQk4adiJCuE2fUCdod+OvqKkZHzXhJ/KTe8uiBUtkc0k3qEsGg4GUo3Nf:lWoI7zGi5ahWc3Im9

Malware Config

Extracted

Family

xworm

Version

5.0

C2

88.0.183.177:1603

88.0.172.65:1603

83.36.190.196:1603

83.38.30.219:1603

Mutex

XpRJMNcN9dWrZEo0

Attributes
  • Install_directory

    %ProgramData%

  • install_file

    RuntimeBroker.exe

aes.plain

Extracted

Family

xworm

C2

88.0.183.177:1603

88.0.172.65:1603

83.36.190.196:1603

83.38.30.219:1603

Attributes
  • Install_directory

    %Temp%

  • install_file

    SecurityHealthSystray.exe

Targets

    • Target

      downloader.exe

    • Size

      70.1MB

    • MD5

      de8c4fd7ed1b7623ab3c9a4e55c17211

    • SHA1

      40f68eb4eb8194fa236f13e980d7d0940db0a9fe

    • SHA256

      192933cb274a687f0072e0db4064e4ee9080b95e303fd0ab9347760bc091e3c2

    • SHA512

      85c4bd56d6187c10baf3278de30268379b23131025e9fb6f21cf040d29c7291db6d3d1beefe0c9a7c814d932f34b0a22bf3443184f30dc4e0244eab2230c374b

    • SSDEEP

      393216:lWxQN89qQk4adiJCuE2fUCdod+OvqKkZHzXhJ/KTe8uiBUtkc0k3qEsGg4GUo3Nf:lWoI7zGi5ahWc3Im9

    • Detect Xworm Payload

    • Xworm

      Xworm is a remote access trojan written in C#.

    • Identifies VirtualBox via ACPI registry values (likely anti-VM)

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • 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.

    • Drops startup file

    • Executes dropped EXE

    • Loads dropped DLL

    • Obfuscated with Agile.Net obfuscator

      Detects use of the Agile.Net commercial obfuscator, which is capable of entity renaming and control flow obfuscation.

    • Themida packer

      Detects Themida, an advanced Windows software protection system.

    • Adds Run key to start application

    • Checks whether UAC is enabled

    • Suspicious use of NtSetInformationThreadHideFromDebugger

MITRE ATT&CK Enterprise v15

Tasks