General

  • Target

    downloader11.exe

  • Size

    70.1MB

  • Sample

    240824-xj8wjawblq

  • MD5

    7e4b04a254d52d6745a5d614ad447636

  • SHA1

    09972b7895437ba28485ed0be0fadc22d6b710b6

  • SHA256

    769e75f011679a606c9a6afbb6380942d08389ace334bfa7399b44bfcbc7db19

  • SHA512

    e85d6e25cdbf6833de0586d477e0fe3741d5223e4f3be8ccc96984dc63eef045ccdf68aaae51c2ff2205da7f911008fbba7915d7553abb5ae92f9bc73c2cc2f8

  • SSDEEP

    393216:lWxQN89qQk4adiJCuE2fUCdod+OvqKkZHzXhJ/KTe8uiBUtkc0k3qRsGg4GUo3N3:lWoI7zGP5ahWc3ImF

Malware Config

Extracted

Family

xworm

C2

83.38.19.195:1603

Attributes
  • Install_directory

    %Temp%

  • install_file

    Runtime Broker.exe

Targets

    • Target

      downloader11.exe

    • Size

      70.1MB

    • MD5

      7e4b04a254d52d6745a5d614ad447636

    • SHA1

      09972b7895437ba28485ed0be0fadc22d6b710b6

    • SHA256

      769e75f011679a606c9a6afbb6380942d08389ace334bfa7399b44bfcbc7db19

    • SHA512

      e85d6e25cdbf6833de0586d477e0fe3741d5223e4f3be8ccc96984dc63eef045ccdf68aaae51c2ff2205da7f911008fbba7915d7553abb5ae92f9bc73c2cc2f8

    • SSDEEP

      393216:lWxQN89qQk4adiJCuE2fUCdod+OvqKkZHzXhJ/KTe8uiBUtkc0k3qRsGg4GUo3N3:lWoI7zGP5ahWc3ImF

    • 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