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
    601s
  • 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, 02:28

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#.

  • Executes dropped EXE 21 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 32 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⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3124
    • 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:4716
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:3576
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:3708
        • 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:4712
        • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
          "C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.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:4160
          • C:\Windows\System32\tar.exe
            "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp39EC.tmp" -C "C:\Users\Admin\AppData\Local\d67800nkmj"
            4⤵
              PID:1544
            • 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:1660
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3552
        • 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:3648
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1580
        • 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:4888
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1908
        • 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:4196
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2596
        • 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:1468
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4492
        • 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:1600
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1460
        • 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:4636
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:404
        • 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:1884
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1140
        • 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:1560
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4144
        • 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:2852
      • C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        C:\Users\Admin\AppData\Local\TeamViewer\m1f1f3a069223072f8d6802a079235d.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:1964
        • 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⤵
            PID:3524

        Network

              MITRE ATT&CK Enterprise v15

              Replay Monitor

              Loading Replay Monitor...

              Downloads

              m1f1f3a069223072f8d6802a079235d.exe.log

              • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\m1f1f3a069223072f8d6802a079235d.exe.log
              • Size 847B
              • SHA256 50a57273ecb794e53b0622eb841341e2643c11f53fa47356e6e754ab2268171d
              • MD5 SHA1 SHA512

              m1f1f3a069223072f8d6802a079235d.exe

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

              tmp39EC.tmp

              • Path C:\Users\Admin\AppData\Local\Temp\tmp39EC.tmp
              • Size 13.3MB
              • SHA256 b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12
              • MD5 SHA1 SHA512 SSDEEP

              cached-microdesc-consensus

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

              cached-microdescs.new

              • Path C:\Users\Admin\AppData\Local\d67800nkmj\data\cached-microdescs.new
              • Size 6.1MB
              • SHA256 bbf36c47fb4bedaef3faa40f04b392e8e4ecbf7ec414b762d0e355c77d2f0112
              • MD5 SHA1 SHA512 SSDEEP

              hostname

              • Path C:\Users\Admin\AppData\Local\d67800nkmj\host\hostname
              • Size 64B
              • SHA256 92965b1df591abf0fe0ed208635ade348328f00304bca6ea8f3e3d155c288c0b
              • MD5 SHA1 SHA512

              port.dat

              • Path C:\Users\Admin\AppData\Local\d67800nkmj\port.dat
              • Size 4B
              • SHA256 9b8bc70a7157cb4ae8712a23476fd320e98bc25ed523de6443ab3e9611d7f583
              • MD5 SHA1 SHA512

              tor.exe

              • Path C:\Users\Admin\AppData\Local\d67800nkmj\tor\tor.exe
              • Size 4.5MB
              • SHA256 719e6913c3de5f8c769b2a0a088402e7542c1ad976ea411a8874f6b71d703d9b
              • MD5 SHA1 SHA512 SSDEEP

              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 806958fd2783d5d760042dd2503af84848cb169b434158af2531213a4634e5f9
              • MD5 SHA1 SHA512

              memory/404-144-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/404-141-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/404-142-0x00000229C4060000-0x00000229C4070000-memory.dmp

              memory/1140-155-0x000001B0ED410000-0x000001B0ED420000-memory.dmp

              memory/1140-154-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/1140-157-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/1460-135-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/1460-132-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/1460-133-0x0000017C57CB0000-0x0000017C57CC0000-memory.dmp

              memory/1580-96-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/1580-94-0x00000215ED4E0000-0x00000215ED4F0000-memory.dmp

              memory/1580-93-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/1908-102-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/1908-109-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/1908-103-0x000001EAFF980000-0x000001EAFF990000-memory.dmp

              memory/1964-179-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/1964-176-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/1964-177-0x000001E3FC060000-0x000001E3FC070000-memory.dmp

              memory/2596-112-0x0000012A72C00000-0x0000012A72C10000-memory.dmp

              memory/2596-114-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/2596-111-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/3124-1-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/3124-0-0x00000232335A0000-0x00000232335F2000-memory.dmp

              memory/3124-6-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/3124-2-0x0000023235410000-0x0000023235420000-memory.dmp

              memory/3552-79-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/3552-71-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/3552-72-0x000001E3BEA40000-0x000001E3BEA50000-memory.dmp

              memory/4144-168-0x000001AA6F760000-0x000001AA6F770000-memory.dmp

              memory/4144-170-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/4144-167-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/4160-53-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/4160-12-0x000001C91BF00000-0x000001C91BF10000-memory.dmp

              memory/4160-11-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/4160-54-0x000001C91BF00000-0x000001C91BF10000-memory.dmp

              memory/4492-126-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp

              memory/4492-124-0x00007FFA191F0000-0x00007FFA19CB2000-memory.dmp