Analysis

  • max time kernel
    149s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26-05-2024 15:38

General

  • Target

    siski.exe

  • Size

    88KB

  • MD5

    a39a9dbad030467f590832a6ab2ff349

  • SHA1

    23b9baed2339451a3dc0d710024e4f010fc89be8

  • SHA256

    db17812e10401ae3cdc44e07272758c155e215ccc2d4859833d7a26e38706d92

  • SHA512

    1ea795f981ecf0abb66c2fc2e1704e5292e319d8ff8d24a7e52b05b03125dc24d46f3b80a5f89acedd7361f0adfc7150a3707f9d41a2b4202e7cd014d359232c

  • SSDEEP

    1536:f62bFTb1Y/aBjS2jklqQZyoJPbUu6Ejbg/YVk36H2VLOO/V2G/cR:t5TyCZjks0ymbttnrVkxLOO2McR

Malware Config

Extracted

Family

xworm

C2

character-estimate.gl.at.ply.gg:61192

Attributes
  • Install_directory

    %ProgramData%

  • install_file

    Chrome.exe

Signatures

  • Detect Xworm Payload 1 IoCs
  • Xworm

    Xworm is a remote access trojan written in C#.

  • Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

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

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Drops startup file 2 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Looks up external IP address via web service 1 IoCs

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

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Suspicious behavior: EnumeratesProcesses 9 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\siski.exe
    "C:\Users\Admin\AppData\Local\Temp\siski.exe"
    1⤵
    • Checks computer location settings
    • Drops startup file
    • Adds Run key to start application
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:636
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\siski.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:4232
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'siski.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1364
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\Chrome.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2764
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Chrome.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1036
  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4388 --field-trial-handle=2252,i,16022092570067181109,3235558581947505669,262144 --variations-seed-version /prefetch:8
    1⤵
      PID:1680

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

      Filesize

      2KB

      MD5

      d85ba6ff808d9e5444a4b369f5bc2730

      SHA1

      31aa9d96590fff6981b315e0b391b575e4c0804a

      SHA256

      84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

      SHA512

      8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      944B

      MD5

      6d3e9c29fe44e90aae6ed30ccf799ca8

      SHA1

      c7974ef72264bbdf13a2793ccf1aed11bc565dce

      SHA256

      2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

      SHA512

      60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      944B

      MD5

      65a68df1062af34622552c4f644a5708

      SHA1

      6f6ecf7b4b635abb0b132d95dac2759dc14b50af

      SHA256

      718dc2f5f4a6dbb7fab7f3db05bd7f602fb16526caae7084ab46c3ab4e7bad35

      SHA512

      4e460eb566032942547b58411222dd26ae300a95f83cf5ae6df58ebd28594341123611b348bd4031a33bc7f38307d5cb8fb677bba8c896919e3eee677a104d4d

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      944B

      MD5

      ef72c47dbfaae0b9b0d09f22ad4afe20

      SHA1

      5357f66ba69b89440b99d4273b74221670129338

      SHA256

      692ec20c7039170fb199510f0436181fd155e6b4516d4d1c9e1675adf99aaa7f

      SHA512

      7514b6bc8dc39fa618223300be27cd535dc35b18c66b4a089e2302e72b3e0cac06d88a989fa1296feb386b3cbe2084019df6430c7f895071b76e04ce559a30b4

    • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_phtjbhiw.0py.ps1

      Filesize

      60B

      MD5

      d17fe0a3f47be24a6453e9ef58c94641

      SHA1

      6ab83620379fc69f80c0242105ddffd7d98d5d9d

      SHA256

      96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

      SHA512

      5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

    • memory/636-1-0x0000000000570000-0x000000000058C000-memory.dmp

      Filesize

      112KB

    • memory/636-2-0x00007FFAE92C0000-0x00007FFAE9D81000-memory.dmp

      Filesize

      10.8MB

    • memory/636-0-0x00007FFAE92C3000-0x00007FFAE92C5000-memory.dmp

      Filesize

      8KB

    • memory/636-60-0x00007FFAE92C0000-0x00007FFAE9D81000-memory.dmp

      Filesize

      10.8MB

    • memory/636-59-0x00007FFAE92C3000-0x00007FFAE92C5000-memory.dmp

      Filesize

      8KB

    • memory/4232-8-0x00000153D0F60000-0x00000153D0F82000-memory.dmp

      Filesize

      136KB

    • memory/4232-20-0x00007FFAE92C0000-0x00007FFAE9D81000-memory.dmp

      Filesize

      10.8MB

    • memory/4232-17-0x00007FFAE92C0000-0x00007FFAE9D81000-memory.dmp

      Filesize

      10.8MB

    • memory/4232-16-0x00007FFAE92C0000-0x00007FFAE9D81000-memory.dmp

      Filesize

      10.8MB

    • memory/4232-15-0x00007FFAE92C0000-0x00007FFAE9D81000-memory.dmp

      Filesize

      10.8MB

    • memory/4232-14-0x00007FFAE92C0000-0x00007FFAE9D81000-memory.dmp

      Filesize

      10.8MB

    • memory/4232-9-0x00007FFAE92C0000-0x00007FFAE9D81000-memory.dmp

      Filesize

      10.8MB