General

  • Target

    downloader (21).exe

  • Size

    70.1MB

  • Sample

    240821-vatddazcnf

  • MD5

    9a8c72bdef6db44c7808c3958c17b757

  • SHA1

    64c63f477df307da20b1254262c3fc5d15147989

  • SHA256

    c988e3d0174cd253d28e9311f1b0f7d7bc291414aef7a904b742ed43391ca83b

  • SHA512

    7a88191bdb74623494e6da37ab5f785aaa201ef9adb0c568eaf68a1d9bd0bada3d3495329d77c0781e68444079cc4ef396665553ec3fc096f8572a27bf560cf6

  • SSDEEP

    393216:lWxQN89qQk4adiJCuE2fUCdod+OvqKkZHzXhJ/KTe8uiBUtkc0k3qnsGg4GUo3Na:lWoI7zGV5ahWc3Im4

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 (21).exe

    • Size

      70.1MB

    • MD5

      9a8c72bdef6db44c7808c3958c17b757

    • SHA1

      64c63f477df307da20b1254262c3fc5d15147989

    • SHA256

      c988e3d0174cd253d28e9311f1b0f7d7bc291414aef7a904b742ed43391ca83b

    • SHA512

      7a88191bdb74623494e6da37ab5f785aaa201ef9adb0c568eaf68a1d9bd0bada3d3495329d77c0781e68444079cc4ef396665553ec3fc096f8572a27bf560cf6

    • SSDEEP

      393216:lWxQN89qQk4adiJCuE2fUCdod+OvqKkZHzXhJ/KTe8uiBUtkc0k3qnsGg4GUo3Na:lWoI7zGV5ahWc3Im4

    • 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