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Analysis

  • max time kernel
    1040s
  • max time network
    1046s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20250217-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20250217-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27/02/2025, 16:06

General

  • Target

    System.Runtime.exe

  • Size

    43KB

  • MD5

    8f06957fd43a38298aa9d6f4bc52c7a7

  • SHA1

    01a72c623c0ce786e01fbc3c165bb1c099a2dc1a

  • SHA256

    afe42ee135f9bbcc385db5751b4867e99aa4caa862bcaaf312e4355a5323145d

  • SHA512

    4b0283befc959340041cfb8c03caccfe3f32971434f34f85c80eba9921bd6e26e664287ec7826492f2047309bfc86e472aa8cb740008df6cf7b61ac94a54484e

  • SSDEEP

    768:ExhcfSe88qd/Ol6IoZmhPH5m7vavCJ8eEP+RULQD9PuGsz1QB6Sc/lE:ExhcfSes6tjBm5ZK+GsD9vg1Qo7/lE

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

C2

if-eventually.gl.at.ply.gg:17094

Mutex

lAxDBRhAFu

Attributes
  • certificate

    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

  • decrypted_key

    -|S.S.S|-

  • key

    yy6zDjAUmbB09pKvo5Hhug==

  • key_x509

    b0FGeVZNcFRMWVloVHR6Z0VESU5RdlpZUmxZbUFE

  • reconnect_delay

    4

  • server_signature

    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

Signatures

  • SilverRat

    SilverRat is trojan written in C#.

  • Silverrat family
  • Sets file to hidden 1 TTPs 2 IoCs

    Modifies file attributes to stop it showing in Explorer etc.

  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Using powershell.exe command.

  • Enumerates physical storage devices 1 TTPs

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

  • Delays execution with timeout.exe 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 20 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.

  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\System.Runtime.exe
    "C:\Users\Admin\AppData\Local\Temp\System.Runtime.exe"
    1⤵
    • Checks computer location settings
    • Adds Run key to start application
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2544
    • C:\Windows\System32\attrib.exe
      "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask"
      2⤵
      • Sets file to hidden
      • Views/modifies file attributes
      PID:1200
    • C:\Windows\System32\attrib.exe
      "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe"
      2⤵
      • Sets file to hidden
      • Views/modifies file attributes
      PID:4028
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpBCB8.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:5076
      • C:\Windows\system32\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:3420
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe"
        3⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:4364
        • C:\Windows\SYSTEM32\schtasks.exe
          "schtasks.exe" /query /TN $77Runtime Broker.exe
          4⤵
            PID:5072
          • C:\Windows\SYSTEM32\schtasks.exe
            "schtasks.exe" /Create /SC ONCE /TN "$77Runtime Broker.exe" /TR "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe \"\$77Runtime Broker.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
            4⤵
            • Scheduled Task/Job: Scheduled Task
            PID:2292
          • C:\Windows\SYSTEM32\schtasks.exe
            "schtasks.exe" /query /TN $77Runtime Broker.exe
            4⤵
              PID:4964
            • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
              "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Set-MpPreference -ExclusionExtension exe,bat,dll,ps1;exit
              4⤵
              • Command and Scripting Interpreter: PowerShell
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              PID:2020
            • C:\Windows\System32\schtasks.exe
              "C:\Windows\System32\schtasks.exe" /create /sc hourly /mo 1 /tn "Runtime Broker_Task-HOURLY-01" /tr "%MyFile%" /st 00:00
              4⤵
              • Scheduled Task/Job: Scheduled Task
              PID:1692
      • C:\Windows\system32\vssvc.exe
        C:\Windows\system32\vssvc.exe
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:5044

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_a1yuneoi.3tt.ps1

        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

      • C:\Users\Admin\AppData\Local\Temp\tmpBCB8.tmp.bat

        Filesize

        197B

        MD5

        1caf1c28ee80c7346d11a1bdd874d7dc

        SHA1

        6049c4c2ee0c224ce02d8e82a1bbc8c57e0961f6

        SHA256

        cc7cdd77562f8fa3e1adf6aedc268d6a0f53d05889ff26d2517de739774b5137

        SHA512

        aafe3e6f55ab330c209edcf3cf9b1dad24b392bf539a660d7778605c2cbf629a9f6994c194807a0f1a102a2932898424caafa18a8a234df9d8810f3cff6d8ca5

      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Templates\WinTask\$77Runtime Broker.exe

        Filesize

        43KB

        MD5

        8f06957fd43a38298aa9d6f4bc52c7a7

        SHA1

        01a72c623c0ce786e01fbc3c165bb1c099a2dc1a

        SHA256

        afe42ee135f9bbcc385db5751b4867e99aa4caa862bcaaf312e4355a5323145d

        SHA512

        4b0283befc959340041cfb8c03caccfe3f32971434f34f85c80eba9921bd6e26e664287ec7826492f2047309bfc86e472aa8cb740008df6cf7b61ac94a54484e

      • memory/2020-21-0x000001E738260000-0x000001E738282000-memory.dmp

        Filesize

        136KB

      • memory/2544-0-0x00007FFEB4993000-0x00007FFEB4995000-memory.dmp

        Filesize

        8KB

      • memory/2544-1-0x0000000000F70000-0x0000000000F80000-memory.dmp

        Filesize

        64KB

      • memory/2544-2-0x00007FFEB4990000-0x00007FFEB5451000-memory.dmp

        Filesize

        10.8MB

      • memory/2544-3-0x00007FFEB4993000-0x00007FFEB4995000-memory.dmp

        Filesize

        8KB

      • memory/2544-4-0x00007FFEB4990000-0x00007FFEB5451000-memory.dmp

        Filesize

        10.8MB

      • memory/2544-10-0x00007FFEB4990000-0x00007FFEB5451000-memory.dmp

        Filesize

        10.8MB