Resubmissions

10/04/2024, 02:58

240410-dgn9kacd4610

10/04/2024, 02:58

240410-dgnm2aff7x10

10/04/2024, 02:58

240410-dgnb9sff7w10

10/04/2024, 02:58

240410-dgm2haff7v10

23/08/2023, 14:58

230823-sb7laaed4110

Analysis

  • max time kernel
    597s
  • max time network
    597s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240221-en
  • resource tags

    arch:x64arch:x86image:win11-20240221-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    10/04/2024, 02:58

General

  • Target
    loader.exe
  • Size 401KB
  • Sample240410-dgnb9sff7w
  • SHA256 8d647fd3ebb00c9d853eb728ff7cba75b7a089d30f84090e3bc1dc460bdd47f3
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • gurcu

C2
  • https://api.telegram.org/bot6193093056:AAHzyNGUGS9aUG6CCx6ENLoXpCFLzEQywIQ/sendMessage?chat_id=1098292643

Signatures

  • Gurcu, WhiteSnake

    Gurcu is a malware stealer written in C#.

  • 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\loader.exe
    "C:\Users\Admin\AppData\Local\Temp\loader.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2848
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "loader" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\loader.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2380
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2548
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:3212
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "loader" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:1824
        • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
          "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe"
          3⤵
          • 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:4216
          • C:\Windows\System32\tar.exe
            "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp74E2.tmp" -C "C:\Users\Admin\AppData\Local\jjmzzxbvaf"
            4⤵
              PID:4836
            • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
              "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
              4⤵
              • Executes dropped EXE
              PID:400
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1184
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1340
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:72
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:2788
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:392
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:4428
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3688
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:5116
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:232
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:2216
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3636
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:2952
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1696
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1648
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3868
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1232
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4496
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1688
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3996
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:4944

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            loader.exe.log

            • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\loader.exe.log
            • Size 847B
            • SHA256 50a57273ecb794e53b0622eb841341e2643c11f53fa47356e6e754ab2268171d
            • MD5 SHA1 SHA512

            loader.exe

            • Path C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
            • Size 401KB
            • SHA256 8d647fd3ebb00c9d853eb728ff7cba75b7a089d30f84090e3bc1dc460bdd47f3
            • MD5 SHA1 SHA512 SSDEEP

            tmp74E2.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\tmp74E2.tmp
            • Size 13.3MB
            • SHA256 b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12
            • MD5 SHA1 SHA512 SSDEEP

            cached-microdesc-consensus

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

            cached-microdescs.new

            • Path C:\Users\Admin\AppData\Local\jjmzzxbvaf\data\cached-microdescs.new
            • Size 5.6MB
            • SHA256 c0180382ad3aa438ae4119030e5be5f4957e4bbee0849250f2cf9d1fabbb6765
            • MD5 SHA1 SHA512 SSDEEP

            hostname

            • Path C:\Users\Admin\AppData\Local\jjmzzxbvaf\host\hostname
            • Size 64B
            • SHA256 9bb20e8650377dd9668bf935d3c4741fc4871637bdcc74c890912047bb3f1d8c
            • MD5 SHA1 SHA512

            port.dat

            • Path C:\Users\Admin\AppData\Local\jjmzzxbvaf\port.dat
            • Size 4B
            • SHA256 daab3aa68185b677bd3c8d63f12e48eacb0851d98d635137e531fd579a452486
            • MD5 SHA1 SHA512

            tor.exe

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

            torrc.txt

            • Path C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt
            • Size 218B
            • SHA256 a2c8729c185f481c61cb83268e3785ae3e17376c7e4aeacfb8eee05cbd793efd
            • MD5 SHA1 SHA512

            memory/72-88-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/72-85-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/72-86-0x000001A2C0D60000-0x000001A2C0D70000-memory.dmp

            memory/232-115-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/232-113-0x000002A5629A0000-0x000002A5629B0000-memory.dmp

            memory/232-112-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/392-101-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/392-98-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/392-99-0x000001C555980000-0x000001C555990000-memory.dmp

            memory/1184-61-0x00000222DC130000-0x00000222DC140000-memory.dmp

            memory/1184-60-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/1184-64-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/1696-137-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/1696-134-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/1696-135-0x000002807DB90000-0x000002807DBA0000-memory.dmp

            memory/2848-1-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/2848-0-0x0000021D58350000-0x0000021D583B8000-memory.dmp

            memory/2848-2-0x0000021D5A0D0000-0x0000021D5A0E0000-memory.dmp

            memory/2848-6-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/3636-126-0x0000017CCC2E0000-0x0000017CCC2F0000-memory.dmp

            memory/3636-128-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/3636-125-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/3688-110-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/3688-107-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/3688-108-0x000001E454720000-0x000001E454730000-memory.dmp

            memory/3868-146-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/3868-144-0x0000021B26670000-0x0000021B26680000-memory.dmp

            memory/3868-143-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/3996-167-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/3996-164-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/3996-165-0x000002A1C19F0000-0x000002A1C1A00000-memory.dmp

            memory/4216-57-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/4216-12-0x0000021770870000-0x0000021770880000-memory.dmp

            memory/4216-58-0x0000021770870000-0x0000021770880000-memory.dmp

            memory/4216-11-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/4496-152-0x00007FF829470000-0x00007FF829F32000-memory.dmp

            memory/4496-154-0x00007FF829470000-0x00007FF829F32000-memory.dmp