Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27-11-2024 22:51

General

  • Target

    SilverClient.exe

  • Size

    44KB

  • MD5

    73da3b5354e231ee5b518758a190ced6

  • SHA1

    a1d5ce5fa7721870a7500eb40337fc56cf72d7e2

  • SHA256

    1ade996dd1fc081601f3ab8befa1307f908499e4bde9968f12ab39dc85ad74ad

  • SHA512

    069a553b74b36251e860b2992ef5688418e022f173fbece7778e14066f4eee030669ecf6b5c1ea96225ec768da0b729306fc51d711dfd30fdf91450a8e1c97f4

  • SSDEEP

    768:JX8w9gjLHx+6AHOTVR/Z5WIRULQeq9hLiuB6SyDADv+/nU:JMw4tAar/Z5zGsr9loJAD2/nU

Malware Config

Extracted

Family

silverrat

Version

1.0.0.0

C2

FBIInvestigation-41427.portmap.host:41427

Mutex

xhhCQtIByF

Attributes
  • certificate

    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

  • decrypted_key

    -|S.S.S|-

  • discord

    https://discord.com/api/webhooks/1307565058028736522/BvuPOnvMCGBluGhgPBunWxSW6sccMPE50iCM97Bct0vExaNkF3__xy6dkdmzHQG2t597

  • key

    yy6zDjAUmbB09pKvo5Hhug==

  • key_x509

    RFNmZ1JPaXBaQXBxS05BdUdsQWNWU0VHREZSbmRK

  • payload_url

    https://g.top4top.io/p_2522c7w8u1.png

  • 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 1 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
  • 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).

  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Delays execution with timeout.exe 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 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 8 IoCs
  • Suspicious use of FindShellTrayWindow 64 IoCs
  • Suspicious use of SendNotifyMessage 64 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 16 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\SilverClient.exe
    "C:\Users\Admin\AppData\Local\Temp\SilverClient.exe"
    1⤵
    • Checks computer location settings
    • Adds Run key to start application
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4320
    • C:\Windows\System32\attrib.exe
      "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\Windows Security Notification"
      2⤵
      • Sets file to hidden
      • Views/modifies file attributes
      PID:4324
    • C:\Windows\System32\attrib.exe
      "C:\Windows\System32\attrib.exe" +s +h "C:\Users\Admin\Windows Security Notification\$77Windows Security Notification.exe"
      2⤵
      • Sets file to hidden
      • Views/modifies file attributes
      PID:2156
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpEFEE.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:752
      • C:\Windows\system32\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:1988
      • C:\Users\Admin\Windows Security Notification\$77Windows Security Notification.exe
        "C:\Users\Admin\Windows Security Notification\$77Windows Security Notification.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:2776
        • C:\Windows\SYSTEM32\schtasks.exe
          "schtasks.exe" /query /TN $77Windows Security Notification.exe
          4⤵
            PID:3276
          • C:\Windows\SYSTEM32\schtasks.exe
            "schtasks.exe" /Create /SC ONCE /TN "$77Windows Security Notification.exe" /TR "C:\Users\Admin\Windows Security Notification\$77Windows Security Notification.exe \"\$77Windows Security Notification.exe\" /AsAdmin" /ST 00:01 /IT /F /RL HIGHEST
            4⤵
            • Scheduled Task/Job: Scheduled Task
            PID:4760
          • C:\Windows\SYSTEM32\schtasks.exe
            "schtasks.exe" /query /TN $77Windows Security Notification.exe
            4⤵
              PID:4412
      • C:\Windows\system32\vssvc.exe
        C:\Windows\system32\vssvc.exe
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:1692
      • C:\Windows\system32\taskmgr.exe
        "C:\Windows\system32\taskmgr.exe" /4
        1⤵
        • Checks SCSI registry key(s)
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        PID:300

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        190B

        MD5

        654cdfdd4f29569a1ba3b1212b3d363f

        SHA1

        a9804d60b90b25bd2300750ac99d67b4c58f95f8

        SHA256

        81a2006e237c697d8328a495b44b33e991dffdca4cb6084ba09634609801f3a8

        SHA512

        b728f994b0183bc15b2dea936e156c2b98476321132ce67199e964c715821c40c503039e3a0ac3b8f7366adfc5b5d144e05e02ae7c49261e9e12ef3f49288faa

      • C:\Users\Admin\Windows Security Notification\$77Windows Security Notification.exe

        Filesize

        44KB

        MD5

        73da3b5354e231ee5b518758a190ced6

        SHA1

        a1d5ce5fa7721870a7500eb40337fc56cf72d7e2

        SHA256

        1ade996dd1fc081601f3ab8befa1307f908499e4bde9968f12ab39dc85ad74ad

        SHA512

        069a553b74b36251e860b2992ef5688418e022f173fbece7778e14066f4eee030669ecf6b5c1ea96225ec768da0b729306fc51d711dfd30fdf91450a8e1c97f4

      • memory/300-15-0x00000163DEC50000-0x00000163DEC51000-memory.dmp

        Filesize

        4KB

      • memory/300-23-0x00000163DEC50000-0x00000163DEC51000-memory.dmp

        Filesize

        4KB

      • memory/300-19-0x00000163DEC50000-0x00000163DEC51000-memory.dmp

        Filesize

        4KB

      • memory/300-20-0x00000163DEC50000-0x00000163DEC51000-memory.dmp

        Filesize

        4KB

      • memory/300-21-0x00000163DEC50000-0x00000163DEC51000-memory.dmp

        Filesize

        4KB

      • memory/300-13-0x00000163DEC50000-0x00000163DEC51000-memory.dmp

        Filesize

        4KB

      • memory/300-22-0x00000163DEC50000-0x00000163DEC51000-memory.dmp

        Filesize

        4KB

      • memory/300-14-0x00000163DEC50000-0x00000163DEC51000-memory.dmp

        Filesize

        4KB

      • memory/300-25-0x00000163DEC50000-0x00000163DEC51000-memory.dmp

        Filesize

        4KB

      • memory/300-24-0x00000163DEC50000-0x00000163DEC51000-memory.dmp

        Filesize

        4KB

      • memory/4320-3-0x00007FFB497F0000-0x00007FFB4A2B1000-memory.dmp

        Filesize

        10.8MB

      • memory/4320-1-0x0000000000B70000-0x0000000000B80000-memory.dmp

        Filesize

        64KB

      • memory/4320-0-0x00007FFB497F3000-0x00007FFB497F5000-memory.dmp

        Filesize

        8KB

      • memory/4320-9-0x00007FFB497F0000-0x00007FFB4A2B1000-memory.dmp

        Filesize

        10.8MB

      • memory/4320-2-0x00007FFB497F0000-0x00007FFB4A2B1000-memory.dmp

        Filesize

        10.8MB