Resubmissions

10/04/2024, 02:28

240410-cyaxtsca4310

10/04/2024, 02:28

240410-cx45aaca3610

10/04/2024, 02:28

240410-cx4hrafc6110

10/04/2024, 02:28

240410-cx37zsfc6y10

14/10/2023, 01:16

231014-bm3ysshd6t10

Analysis

  • max time kernel
    598s
  • max time network
    602s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10/04/2024, 02:28

General

  • Target
    m1f1f3a069223072f8d6802a079235d.exe
  • Size 306KB
  • Sample240410-cx4hrafc61
  • SHA256 c2e57e9b6e52a5429ae7a7bd36c57f63589d78fbf0ffe5760ada4a67b9fadec9
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • gurcu

C2
  • https://api.telegram.org/bot6209822134:AAHQxD-CI1YDVcNbXijXHlonsEUgv3dfYtg/sendMessage?chat_id=-1001529292045

Signatures

  • Gurcu, WhiteSnake

    Gurcu is a malware stealer written in C#.

  • Checks computer location settings 2 TTPs 12 IoCs

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

  • Executes dropped EXE 22 IoCs
  • Reads WinSCP keys stored on the system 2 TTPs

    Tries to access WinSCP stored sessions.

  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses Microsoft Outlook profiles 1 TTPs 3 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).

  • Creates scheduled task(s) 1 TTPs 1 IoCs

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

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 12 IoCs
  • Suspicious use of WriteProcessMemory 34 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.

  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\m1f1f3a069223072f8d6802a079235d.exe
    "C:\Users\Admin\AppData\Local\Temp\m1f1f3a069223072f8d6802a079235d.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1120
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "m1f1f3a069223072f8d6802a079235d" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\m1f1f3a069223072f8d6802a079235d.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4820
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:3944
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2476
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "m1f1f3a069223072f8d6802a079235d" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:3336
        • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
          "C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe"
          3⤵
          • Checks computer location settings
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          • outlook_office_path
          • outlook_win_path
          PID:4804
          • C:\Windows\System32\tar.exe
            "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp3F99.tmp" -C "C:\Users\Admin\AppData\Local\d67800nkmj"
            4⤵
              PID:5036
            • C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
              "C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt"
              4⤵
              • Executes dropped EXE
              PID:1608
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3436
        • C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
          "C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:3064
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:264
        • C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
          "C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1432
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3076
        • C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
          "C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:3812
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3988
        • C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
          "C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:3636
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3616
        • C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
          "C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:4148
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2240
        • C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
          "C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:3668
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1484
        • C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
          "C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1280
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:868
        • C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
          "C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:888
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1516
        • C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
          "C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1480
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:900
        • C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
          "C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:2240

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            m1f1f3a069223072f8d6802a079235d.exe.log

            • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\m1f1f3a069223072f8d6802a079235d.exe.log
            • Size 847B
            • SHA256 169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e
            • MD5 SHA1 SHA512

            m1f1f3a069223072f8d6802a079235d.exe

            • Path C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
            • Size 306KB
            • SHA256 c2e57e9b6e52a5429ae7a7bd36c57f63589d78fbf0ffe5760ada4a67b9fadec9
            • MD5 SHA1 SHA512 SSDEEP

            tmp3F99.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\tmp3F99.tmp
            • Size 13.3MB
            • SHA256 b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12
            • MD5 SHA1 SHA512 SSDEEP

            cached-microdesc-consensus.tmp

            • Path C:\Users\Admin\AppData\Local\d67800nkmj\data\cached-microdesc-consensus.tmp
            • Size 2.7MB
            • SHA256 60b43cdce0f807f7891521f396f53def34a7d98986dbde0faa2a197189c587f3
            • MD5 SHA1 SHA512 SSDEEP

            cached-microdescs.new

            • Path C:\Users\Admin\AppData\Local\d67800nkmj\data\cached-microdescs.new
            • Size 7.1MB
            • SHA256 e36691df7629faa18980ecb8203ee6982bc1eee97a9b7b8617388a25b8c36bf4
            • MD5 SHA1 SHA512 SSDEEP

            hostname

            • Path C:\Users\Admin\AppData\Local\d67800nkmj\host\hostname
            • Size 64B
            • SHA256 d8efa969e8647e1f705ac859254df36d75d59425980b818ac2b1d723f05e408e
            • MD5 SHA1 SHA512

            port.dat

            • Path C:\Users\Admin\AppData\Local\d67800nkmj\port.dat
            • Size 4B
            • SHA256 4694198984395866f16672b054993e24292cdfd7524af731f7db024a62e3271d
            • MD5 SHA1 SHA512

            tor.exe

            • Path C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
            • Size 7.4MB
            • SHA256 46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82
            • MD5 SHA1 SHA512 SSDEEP

            torrc.txt

            • Path C:\Users\Admin\AppData\Local\d67800nkmj\torrc.txt
            • Size 218B
            • SHA256 0bb4a1b1aff58e0754c3eb3796ab581b6589117f9f9788ea2bdb54ae1af69ef0
            • MD5 SHA1 SHA512

            memory/264-69-0x0000021D7F230000-0x0000021D7F240000-memory.dmp

            memory/264-68-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/264-71-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/868-155-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/868-153-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/900-167-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/900-165-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/1120-4-0x0000028C42D00000-0x0000028C42D10000-memory.dmp

            memory/1120-6-0x00007FF9802A0000-0x00007FF980D61000-memory.dmp

            memory/1120-1-0x00007FF9802A0000-0x00007FF980D61000-memory.dmp

            memory/1120-0-0x0000028C28640000-0x0000028C28692000-memory.dmp

            memory/1484-141-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/1484-143-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/1516-157-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/1516-159-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/2240-129-0x000001B19A310000-0x000001B19A320000-memory.dmp

            memory/2240-131-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/2240-128-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/3076-94-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/3076-95-0x0000021626CA0000-0x0000021626CB0000-memory.dmp

            memory/3076-97-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/3436-62-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/3436-59-0x000002AEA5270000-0x000002AEA5280000-memory.dmp

            memory/3436-58-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/3616-122-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/3616-120-0x00000257EE710000-0x00000257EE720000-memory.dmp

            memory/3616-119-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/3988-109-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/3988-107-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/4804-12-0x000001E669280000-0x000001E669290000-memory.dmp

            memory/4804-49-0x000001E669280000-0x000001E669290000-memory.dmp

            memory/4804-48-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp

            memory/4804-11-0x00007FF97ECC0000-0x00007FF97F781000-memory.dmp