Analysis

  • max time kernel
    144s
  • max time network
    149s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240426-en
  • resource tags

    arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-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.

  • 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⤵
    • 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:5000
    • 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:3432
    • 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:2348
    • 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:2452
    • 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:4260

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    2KB

    MD5

    627073ee3ca9676911bee35548eff2b8

    SHA1

    4c4b68c65e2cab9864b51167d710aa29ebdcff2e

    SHA256

    85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

    SHA512

    3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

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

    Filesize

    944B

    MD5

    1a9fa92a4f2e2ec9e244d43a6a4f8fb9

    SHA1

    9910190edfaccece1dfcc1d92e357772f5dae8f7

    SHA256

    0ee052d5333fd5fd86bc84856fec98e045f077a7ac8051651bf7c521b9706888

    SHA512

    5d2361476fa22200e6f83883efe7dcb8c3fe7dae8d56e04e28a36e9ae1270c327b6aa161d92b239593da7661289d002c574446ecfd6bd19928209aae25e3ef64

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

    Filesize

    944B

    MD5

    4093e5ab3812960039eba1a814c2ffb0

    SHA1

    b5e4a98a80be72fccd3cc910e93113d2febef298

    SHA256

    c0794e2b7036ce5612446a8b15e0c8387773bbc921f63cf8849f8a1f4ef3878c

    SHA512

    f3555b45aa1a1dd5214716dc81a05905c4ecd5a3e1276d35e08c65623ab1d14d469b3b576a5d9638264c1222d73889d2cc1ee43fb579d9ca3fcddd9f557cac7b

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

    Filesize

    944B

    MD5

    aa6b748cd8f3e3c0e41549529b919e21

    SHA1

    5a4b9721f9fb5042f6ef7afd698d5ac5216a88bb

    SHA256

    d7d665a42f940443efb28eb231dfe1c4062394e71fba145d6eea9ec075b0f0e8

    SHA512

    361c523f49428a7e430279099e669a1a8af8764653f42e83105c0da3f8e8dd3be6c1719ea8c158d8f2e8425d74457147a4683190eb4a67019b9d02be44c13534

  • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_vwlvdq4k.rjn.ps1

    Filesize

    60B

    MD5

    d17fe0a3f47be24a6453e9ef58c94641

    SHA1

    6ab83620379fc69f80c0242105ddffd7d98d5d9d

    SHA256

    96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

    SHA512

    5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

  • memory/3432-12-0x00007FFF0D8F0000-0x00007FFF0E3B2000-memory.dmp

    Filesize

    10.8MB

  • memory/3432-13-0x00000249AE330000-0x00000249AE352000-memory.dmp

    Filesize

    136KB

  • memory/3432-14-0x00007FFF0D8F0000-0x00007FFF0E3B2000-memory.dmp

    Filesize

    10.8MB

  • memory/3432-15-0x00007FFF0D8F0000-0x00007FFF0E3B2000-memory.dmp

    Filesize

    10.8MB

  • memory/3432-18-0x00007FFF0D8F0000-0x00007FFF0E3B2000-memory.dmp

    Filesize

    10.8MB

  • memory/3432-19-0x00007FFF0D8F0000-0x00007FFF0E3B2000-memory.dmp

    Filesize

    10.8MB

  • memory/3432-11-0x00007FFF0D8F0000-0x00007FFF0E3B2000-memory.dmp

    Filesize

    10.8MB

  • memory/5000-1-0x00007FFF0D8F3000-0x00007FFF0D8F5000-memory.dmp

    Filesize

    8KB

  • memory/5000-2-0x00007FFF0D8F0000-0x00007FFF0E3B2000-memory.dmp

    Filesize

    10.8MB

  • memory/5000-0-0x0000000000980000-0x000000000099C000-memory.dmp

    Filesize

    112KB

  • memory/5000-55-0x00007FFF0D8F0000-0x00007FFF0E3B2000-memory.dmp

    Filesize

    10.8MB