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General

  • Target

    fwanufwa.exe

  • Size

    16.7MB

  • Sample

    240504-xv2xcsah36

  • MD5

    157d1a68e8368cb8ed46e3173122562b

  • SHA1

    9fda498d3101ab26afe01a630f7dfec445cbef0c

  • SHA256

    aa1beca1ce33a11a5c56a8a79d03e38b51339d0fe977495ad72eb8b068b379bc

  • SHA512

    94ccf7674c0f5f849cd28c04da7d4dd045107fe78ca98e62f622511c3953ef94b6f248703820b29d01713d062984b300b37d5ba1c7d2e5b15febeddcb603a83d

  • SSDEEP

    393216:Aw73+t5XTNsNiI7T+PkdymUAZDtGACaeIXHZzvhh0fLD4DbTpcF13X:AQ3+t7I7TXCaeaZzv7GDAcF13

Malware Config

Extracted

Family

xworm

C2

94.13.152.8:25565

Attributes
  • Install_directory

    %AppData%

  • install_file

    XClient.exe

Targets

    • Target

      fwanufwa.exe

    • Size

      16.7MB

    • MD5

      157d1a68e8368cb8ed46e3173122562b

    • SHA1

      9fda498d3101ab26afe01a630f7dfec445cbef0c

    • SHA256

      aa1beca1ce33a11a5c56a8a79d03e38b51339d0fe977495ad72eb8b068b379bc

    • SHA512

      94ccf7674c0f5f849cd28c04da7d4dd045107fe78ca98e62f622511c3953ef94b6f248703820b29d01713d062984b300b37d5ba1c7d2e5b15febeddcb603a83d

    • SSDEEP

      393216:Aw73+t5XTNsNiI7T+PkdymUAZDtGACaeIXHZzvhh0fLD4DbTpcF13X:AQ3+t7I7TXCaeaZzv7GDAcF13

    • Deletes NTFS Change Journal

      The USN change journal is a persistent log of all changes made to local files used by Windows Server systems.

    • 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.

    • Command and Scripting Interpreter: PowerShell

      Using powershell.exe command.

    • Sets DLL path for service in the registry

    • Stops running service(s)

    • 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

    • Themida packer

      Detects Themida, an advanced Windows software protection system.

    • Adds Run key to start application

    • Checks whether UAC is enabled

    • Enumerates connected drives

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

    • 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 NtSetInformationThreadHideFromDebugger

MITRE ATT&CK Enterprise v15

Tasks