Resubmissions

10/04/2024, 02:52

240410-dcqxlaff2v10

10/04/2024, 02:52

240410-dcqltscc7210

10/04/2024, 02:51

240410-dcm6pscc6710

10/04/2024, 02:51

240410-dcmj6scc6610

14/10/2023, 04:10

231014-erhp7sga6y10

Analysis

  • max time kernel
    595s
  • max time network
    600s
  • 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, 02:51

General

  • Target
    f21559ac7c67d871d4f05.exe
  • Size 327KB
  • Sample240410-dcm6pscc67
  • SHA256 dba8f020ac6d09728422932492657fea3f0a95754cd279f5a949b6982bd32129
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • gurcu

C2
  • https://api.telegram.org/bot5968091729:AAHVag_ncx5c5AIYERGTqv9kr7clJT1_HDU/sendMessage?chat_id=-1001962300376

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
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • 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 2 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\f21559ac7c67d871d4f05.exe
    "C:\Users\Admin\AppData\Local\Temp\f21559ac7c67d871d4f05.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3632
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "f21559ac7c67d871d4f05" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\f21559ac7c67d871d4f05.exe" &&START "" "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3544
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:3164
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:4232
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "f21559ac7c67d871d4f05" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:1540
        • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
          "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.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:4140
          • C:\Windows\System32\tar.exe
            "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp5D24.tmp" -C "C:\Users\Admin\AppData\Local\z1jp774dks"
            4⤵
              PID:2776
            • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
              "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
              4⤵
              • Executes dropped EXE
              PID:4496
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1804
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:2076
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2924
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:4692
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2260
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:2132
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2772
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:4920
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1284
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:3964
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2556
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1240
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4736
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1196
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:400
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:3508
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4968
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:5072
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1564
        • C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
          "C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:4904

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            f21559ac7c67d871d4f05.exe.log

            • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\f21559ac7c67d871d4f05.exe.log
            • Size 847B
            • SHA256 169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e
            • MD5 SHA1 SHA512

            f21559ac7c67d871d4f05.exe

            • Path C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
            • Size 327KB
            • SHA256 dba8f020ac6d09728422932492657fea3f0a95754cd279f5a949b6982bd32129
            • MD5 SHA1 SHA512 SSDEEP

            tmp5D24.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\tmp5D24.tmp
            • Size 13.3MB
            • SHA256 b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12
            • MD5 SHA1 SHA512 SSDEEP

            cached-microdesc-consensus.tmp

            • Path C:\Users\Admin\AppData\Local\z1jp774dks\data\cached-microdesc-consensus.tmp
            • Size 2.7MB
            • SHA256 60b43cdce0f807f7891521f396f53def34a7d98986dbde0faa2a197189c587f3
            • MD5 SHA1 SHA512 SSDEEP

            cached-microdescs.new

            • Path C:\Users\Admin\AppData\Local\z1jp774dks\data\cached-microdescs.new
            • Size 5.6MB
            • SHA256 26fec4e4f9243613eae60171f860c4e9035553ec63054a144b825c16b7d5e0fe
            • MD5 SHA1 SHA512 SSDEEP

            hostname

            • Path C:\Users\Admin\AppData\Local\z1jp774dks\host\hostname
            • Size 64B
            • SHA256 0a3bebc6c89cdf58d69f4f8abf6654fb7739347d4e8b859d49b8af44ff18be67
            • MD5 SHA1 SHA512

            port.dat

            • Path C:\Users\Admin\AppData\Local\z1jp774dks\port.dat
            • Size 4B
            • SHA256 eac627facfe5f552055d76c0196a0ffc413dfeb940bc0ccb85b60fcaf7b773f5
            • MD5 SHA1 SHA512

            tor.exe

            • Path C:\Users\Admin\AppData\Local\z1jp774dks\tor\tor.exe
            • Size 7.4MB
            • SHA256 46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82
            • MD5 SHA1 SHA512 SSDEEP

            torrc.txt

            • Path C:\Users\Admin\AppData\Local\z1jp774dks\torrc.txt
            • Size 218B
            • SHA256 a63295928b35f44ac250fa2f0343b1c279c10cae6452a605c0a383ffad86d2b0
            • MD5 SHA1 SHA512

            memory/400-151-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/400-149-0x00000224D4800000-0x00000224D4810000-memory.dmp

            memory/400-148-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/1284-122-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/1284-120-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/1564-169-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/1564-172-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/1564-170-0x00000248F3730000-0x00000248F3740000-memory.dmp

            memory/1804-57-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/1804-58-0x00000231C2F70000-0x00000231C2F80000-memory.dmp

            memory/1804-61-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/2260-102-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/2260-103-0x000001D6F4D00000-0x000001D6F4D10000-memory.dmp

            memory/2260-105-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/2556-134-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/2556-132-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/2772-114-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/2772-112-0x0000015A2FDE0000-0x0000015A2FDF0000-memory.dmp

            memory/2772-111-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/2924-86-0x000001DFE0660000-0x000001DFE0670000-memory.dmp

            memory/2924-85-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/2924-88-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/3632-6-0x00007FFB677A0000-0x00007FFB68261000-memory.dmp

            memory/3632-0-0x000001EA30350000-0x000001EA303A8000-memory.dmp

            memory/3632-3-0x00007FFB677A0000-0x00007FFB68261000-memory.dmp

            memory/3632-4-0x000001EA32170000-0x000001EA32180000-memory.dmp

            memory/4140-12-0x000002434FE60000-0x000002434FE70000-memory.dmp

            memory/4140-11-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/4140-55-0x000002434FE60000-0x000002434FE70000-memory.dmp

            memory/4140-54-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/4736-146-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/4736-144-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/4968-157-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp

            memory/4968-159-0x00007FFB5BB40000-0x00007FFB5C601000-memory.dmp