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
    596s
  • max time network
    600s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240214-en
  • resource tags

    arch:x64arch:x86image:win11-20240214-enlocale:en-usos:windows11-21h2-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#.

  • Executes dropped EXE 20 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 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 11 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\f21559ac7c67d871d4f05.exe
    "C:\Users\Admin\AppData\Local\Temp\f21559ac7c67d871d4f05.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4896
    • 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:2600
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:3964
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:4616
        • 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:3700
        • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
          "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.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:3608
          • C:\Windows\System32\tar.exe
            "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp568C.tmp" -C "C:\Users\Admin\AppData\Local\z1jp774dks"
            4⤵
              PID:2428
            • 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:3344
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3556
        • 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:1540
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2024
        • 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:4752
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:444
        • 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:2704
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:472
        • 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:2532
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3440
        • 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:2512
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1628
        • 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:2968
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2652
        • 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:3340
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2888
        • 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:3316
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1572
        • 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:2236

      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 50a57273ecb794e53b0622eb841341e2643c11f53fa47356e6e754ab2268171d
            • MD5 SHA1 SHA512

            f21559ac7c67d871d4f05.exe

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

            tmp568C.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\tmp568C.tmp
            • Size 13.3MB
            • SHA256 b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12
            • MD5 SHA1 SHA512 SSDEEP

            cached-certs

            • Path C:\Users\Admin\AppData\Local\z1jp774dks\data\cached-certs
            • Size 18KB
            • SHA256 e58efd0eeb353d92b3fe8e47210d6ee898edbdc7ca2a3c7e6cf81ce2f454c328
            • MD5 SHA1 SHA512 SSDEEP

            cached-microdesc-consensus

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

            cached-microdescs.new

            • Path C:\Users\Admin\AppData\Local\z1jp774dks\data\cached-microdescs.new
            • Size 8.0MB
            • SHA256 fed44984a6e9abc23f8c72aa797c64c9aa941fe03f2eeeec83764c24ebc518d2
            • MD5 SHA1 SHA512 SSDEEP

            hostname

            • Path C:\Users\Admin\AppData\Local\z1jp774dks\host\hostname
            • Size 64B
            • SHA256 e92a563fd5f5f19b3cda94bbe099be585117ae50e58e3e2580953da546e53020
            • MD5 SHA1 SHA512

            port.dat

            • Path C:\Users\Admin\AppData\Local\z1jp774dks\port.dat
            • Size 4B
            • SHA256 44313a51f457afd48ad52fe8839cbf409da09c4c8ee84afac9030612ea42c502
            • 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 a033e7939aef0f988f36f0b430926869d11bf010c4290710927eeeb80f3cb1ee
            • MD5 SHA1 SHA512

            memory/444-108-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/444-106-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/472-110-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/472-112-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/1572-165-0x000001FA7BFA0000-0x000001FA7BFB0000-memory.dmp

            memory/1572-167-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/1572-164-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/1628-134-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/1628-136-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/2024-94-0x0000023077940000-0x0000023077950000-memory.dmp

            memory/2024-96-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/2024-93-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/2652-142-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/2652-143-0x000002896F8D0000-0x000002896F8E0000-memory.dmp

            memory/2652-145-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/2888-154-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/2888-152-0x00000205F7EF0000-0x00000205F7F00000-memory.dmp

            memory/2888-151-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/3440-122-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/3440-124-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/3556-75-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/3556-79-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/3556-76-0x00000280CB010000-0x00000280CB020000-memory.dmp

            memory/3608-11-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/3608-12-0x000001D1E3AD0000-0x000001D1E3AE0000-memory.dmp

            memory/3608-40-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/3608-41-0x000001D1E3AD0000-0x000001D1E3AE0000-memory.dmp

            memory/4896-1-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/4896-6-0x00007FFB251F0000-0x00007FFB25CB2000-memory.dmp

            memory/4896-2-0x0000017D54DE0000-0x0000017D54DF0000-memory.dmp

            memory/4896-0-0x0000017D3A6D0000-0x0000017D3A728000-memory.dmp