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02-09-2024 02:27

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Analysis

  • max time kernel
    148s
  • max time network
    154s
  • platform
    windows10-1703_x64
  • resource
    win10-20240404-en
  • resource tags

    arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
  • submitted
    02-09-2024 02:27

General

  • Target

    RAT/XClient.exe

  • Size

    172KB

  • MD5

    75ba783757c5b61bd841afa136fc3eda

  • SHA1

    8db9cda9508471a23f9b743027fa115e01bc1fe1

  • SHA256

    75a8719e83e4aecbe51287d7bfaf1e334fa190c7784324f24bcf61ab984de20a

  • SHA512

    9a6cfbf4302336662527837bf60b30b458f8d438bd6e9563093d4948bf81c79d56578e965d836e90aafde553d1cdc9c6df81a254aafcfb3379fbe6405dce0ea1

  • SSDEEP

    1536:vJcr5kCyoAp30kaF6CiJzt7UbjFdZe8e6TOAJkU7JsOpysa7iAMI:BcmNNxda6zZUbjHZe8jO6H2OpYuAf

Malware Config

Extracted

Family

xworm

Attributes
  • Install_directory

    %AppData%

  • install_file

    XClient.exe

  • pastebin_url

    https://pastebin.com/raw/2jTT3Lnj

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
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 5 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 13 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\RAT\XClient.exe
    "C:\Users\Admin\AppData\Local\Temp\RAT\XClient.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:3928
    • 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\RAT\XClient.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:5012
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:664
    • 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\Roaming\XClient.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3636
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      PID:1720

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

    3KB

    MD5

    8592ba100a78835a6b94d5949e13dfc1

    SHA1

    63e901200ab9a57c7dd4c078d7f75dcd3b357020

    SHA256

    fdd7d9def6f9f0c0f2e60dbc8a2d1999071cd7d3095e9e087bb1cda7a614ac3c

    SHA512

    87f98e6cb61b2a2a7d65710c4d33881d89715eb7a06e00d492259f35c3902498baabffc5886be0ec5a14312ad4c262e3fc40cd3a5cb91701af0fb229726b88c3

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

    Filesize

    1KB

    MD5

    6e1a132ea36181b103e02d463da0e0bf

    SHA1

    160620eac2b420a8e7386eba606fee8d0d708806

    SHA256

    c4537fb44d5808f6450d8ee2ac61c963bd2c6e3e650e7b48b5d83b5d11d2b30a

    SHA512

    3034a371f9c3c70ee7fed8e71544034aaff972ca30b729c8a9ea2e5486b35157e29f2f8c7a9cbc374488aeb2f2c0dacf177b71231a62ce76e59a2f0cd445f2b5

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

    Filesize

    1KB

    MD5

    a80ff6cefb84e519d8943755966fe9ac

    SHA1

    269fa826a6a0ec6979cd1e5f58dac18d33f7019a

    SHA256

    757e1059a78096f4c5a7481323f411001d60aadc90ee96f192421b7765177e27

    SHA512

    15284c2238a7efadeeef952431d7e2195885c011b2c94cddc7357aec5039d461eaf50cdeea8b0aca8cd809c6f0cb784cb0c076f5c79dfed8c52f21b9e39d2d6a

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

    Filesize

    1KB

    MD5

    e7a4c24b86dff71e27d7be17baad98c2

    SHA1

    8e0340cdf9d76314192d5df9a0a7fc451725858d

    SHA256

    aee56697d10648b7f7a580c40b9cc38db98a6c8d47f77a58aa889f151daefeba

    SHA512

    c81dc67e33040e2b6cc960474191f9643c5ac7d5a02d1dfd2f86c551320115efe448288b68d31aafb3df1f723a7756d0570cdf32d8e089f1f64626153221d0e3

  • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_1gwr0gsn.biw.ps1

    Filesize

    1B

    MD5

    c4ca4238a0b923820dcc509a6f75849b

    SHA1

    356a192b7913b04c54574d18c28d46e6395428ab

    SHA256

    6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b

    SHA512

    4dff4ea340f0a823f15d3f4f01ab62eae0e5da579ccb851f8db9dfe84c58b2b37b89903a740e1ee172da793a6e79d560e5f7f9bd058a12a280433ed6fa46510a

  • memory/3928-1-0x0000000000B60000-0x0000000000B90000-memory.dmp

    Filesize

    192KB

  • memory/3928-2-0x00007FFAA1110000-0x00007FFAA1AFC000-memory.dmp

    Filesize

    9.9MB

  • memory/3928-186-0x00007FFAA1110000-0x00007FFAA1AFC000-memory.dmp

    Filesize

    9.9MB

  • memory/3928-0-0x00007FFAA1113000-0x00007FFAA1114000-memory.dmp

    Filesize

    4KB

  • memory/5012-10-0x00007FFAA1110000-0x00007FFAA1AFC000-memory.dmp

    Filesize

    9.9MB

  • memory/5012-51-0x00007FFAA1110000-0x00007FFAA1AFC000-memory.dmp

    Filesize

    9.9MB

  • memory/5012-13-0x000001896F9D0000-0x000001896FA46000-memory.dmp

    Filesize

    472KB

  • memory/5012-9-0x00007FFAA1110000-0x00007FFAA1AFC000-memory.dmp

    Filesize

    9.9MB

  • memory/5012-8-0x000001896F800000-0x000001896F822000-memory.dmp

    Filesize

    136KB

  • memory/5012-7-0x00007FFAA1110000-0x00007FFAA1AFC000-memory.dmp

    Filesize

    9.9MB