Analysis

  • max time kernel
    564s
  • max time network
    593s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240426-en
  • resource tags

    arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    30-05-2024 12:27

General

  • Target

    XClient.exe

  • Size

    62KB

  • MD5

    ec8785fe24a3652b48f3c26305fbe895

  • SHA1

    55d19ee15841fc8f9862d1c5eed0884b7c0b4363

  • SHA256

    43acaa8dd6ef2afc04a0c5de6b4c6ffb879e79af8c4ebcc033c9a230ffa7944a

  • SHA512

    20e792dfe3d50159bc67267ab067dbdf4b29c52cd865bb7fbacfcb6e1b0a52a10a9fe5efb09b3f074c01b06feb8354ee293ecdb0b1c843e530f6d2cd2278824d

  • SSDEEP

    1536:mI/gDbWOkAlgI7RxE6kkbftYV5j6M5O5Jf7:mIAiAlN7RxEVkbfOhO5R7

Malware Config

Extracted

Family

xworm

Attributes
  • Install_directory

    %AppData%

  • install_file

    Runtime Broker.exe

  • pastebin_url

    https://pastebin.com/raw/kYPYyCCf

Signatures

  • Detect Xworm Payload 2 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
  • Executes dropped EXE 10 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious use of AdjustPrivilegeToken 16 IoCs
  • Suspicious use of WriteProcessMemory 10 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\XClient.exe
    "C:\Users\Admin\AppData\Local\Temp\XClient.exe"
    1⤵
    • Drops startup file
    • Adds Run key to start application
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1844
    • 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\XClient.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2584
    • 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:4212
    • 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\Runtime Broker.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2400
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Runtime Broker.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3064
    • C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Runtime Broker" /tr "C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"
      2⤵
      • Creates scheduled task(s)
      PID:5048
  • C:\Users\Admin\AppData\Roaming\Runtime Broker.exe
    "C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:2208
  • C:\Users\Admin\AppData\Roaming\Runtime Broker.exe
    "C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:2748
  • C:\Users\Admin\AppData\Roaming\Runtime Broker.exe
    "C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:3428
  • C:\Users\Admin\AppData\Roaming\Runtime Broker.exe
    "C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:4340
  • C:\Users\Admin\AppData\Roaming\Runtime Broker.exe
    "C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:4320
  • C:\Users\Admin\AppData\Roaming\Runtime Broker.exe
    "C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:4048
  • C:\Users\Admin\AppData\Roaming\Runtime Broker.exe
    "C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:3632
  • C:\Users\Admin\AppData\Roaming\Runtime Broker.exe
    "C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:3692
  • C:\Users\Admin\AppData\Roaming\Runtime Broker.exe
    "C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:112
  • C:\Users\Admin\AppData\Roaming\Runtime Broker.exe
    "C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:4812

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    654B

    MD5

    2cbbb74b7da1f720b48ed31085cbd5b8

    SHA1

    79caa9a3ea8abe1b9c4326c3633da64a5f724964

    SHA256

    e31b18f21621d9983bfdf1ea3e53884a9d58b8ffd79e0e5790da6f3a81a8b9d3

    SHA512

    ecf02d5240e0c1c005d3ab393aa7eff62bd498c2db5905157e2bf6d29e1b663228a9583950842629d1a4caef404c8941a0c7799b1a3bd1eb890a09fdb7efcff9

  • 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

    781da0576417bf414dc558e5a315e2be

    SHA1

    215451c1e370be595f1c389f587efeaa93108b4c

    SHA256

    41a5aef8b0bbeea2766f40a7bba2c78322379f167c610f7055ccb69e7db030fe

    SHA512

    24e283aa30a2903ebe154dad49b26067a45e46fec57549ad080d3b9ec3f272044efaaed3822d067837f5521262192f466c47195ffe7f75f8c7c5dcf3159ea737

  • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_qxjnhxr2.fww.ps1

    Filesize

    60B

    MD5

    d17fe0a3f47be24a6453e9ef58c94641

    SHA1

    6ab83620379fc69f80c0242105ddffd7d98d5d9d

    SHA256

    96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

    SHA512

    5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

  • C:\Users\Admin\AppData\Roaming\Runtime Broker.exe

    Filesize

    62KB

    MD5

    ec8785fe24a3652b48f3c26305fbe895

    SHA1

    55d19ee15841fc8f9862d1c5eed0884b7c0b4363

    SHA256

    43acaa8dd6ef2afc04a0c5de6b4c6ffb879e79af8c4ebcc033c9a230ffa7944a

    SHA512

    20e792dfe3d50159bc67267ab067dbdf4b29c52cd865bb7fbacfcb6e1b0a52a10a9fe5efb09b3f074c01b06feb8354ee293ecdb0b1c843e530f6d2cd2278824d

  • memory/1844-1-0x0000000000A40000-0x0000000000A56000-memory.dmp

    Filesize

    88KB

  • memory/1844-0-0x00007FFC80FE3000-0x00007FFC80FE5000-memory.dmp

    Filesize

    8KB

  • memory/1844-59-0x00007FFC80FE0000-0x00007FFC81AA2000-memory.dmp

    Filesize

    10.8MB

  • memory/1844-55-0x00007FFC80FE3000-0x00007FFC80FE5000-memory.dmp

    Filesize

    8KB

  • memory/1844-54-0x00007FFC80FE0000-0x00007FFC81AA2000-memory.dmp

    Filesize

    10.8MB

  • memory/2584-10-0x00000146266E0000-0x0000014626702000-memory.dmp

    Filesize

    136KB

  • memory/2584-18-0x00007FFC80FE0000-0x00007FFC81AA2000-memory.dmp

    Filesize

    10.8MB

  • memory/2584-15-0x00007FFC80FE0000-0x00007FFC81AA2000-memory.dmp

    Filesize

    10.8MB

  • memory/2584-14-0x00007FFC80FE0000-0x00007FFC81AA2000-memory.dmp

    Filesize

    10.8MB

  • memory/2584-13-0x00007FFC80FE0000-0x00007FFC81AA2000-memory.dmp

    Filesize

    10.8MB

  • memory/2584-12-0x00007FFC80FE0000-0x00007FFC81AA2000-memory.dmp

    Filesize

    10.8MB

  • memory/2584-11-0x00007FFC80FE0000-0x00007FFC81AA2000-memory.dmp

    Filesize

    10.8MB