Resubmissions

10/04/2024, 02:38

240410-c4pceacb2410

10/04/2024, 02:37

240410-c4ne4scb2310

10/04/2024, 02:37

240410-c4llhsca9910

10/04/2024, 02:37

240410-c4jf6aca9810

14/10/2023, 01:31

231014-bxezqahg8w10

Analysis

  • max time kernel
    300s
  • max time network
    305s
  • 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, 02:37

General

  • Target
    k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
  • Size 339KB
  • Sample240410-c4jf6aca98
  • SHA256 d71329c78c704ee9cc7133761b5e738a315e7eb784e348d7743a8a7366724e9f
  • 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 12 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 7 IoCs
  • Suspicious use of WriteProcessMemory 24 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\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
    "C:\Users\Admin\AppData\Local\Temp\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:244
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "k2fef4820980d3c2c1f2cce2f95e94f5e1c18" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:5100
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:3948
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:1308
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "k2fef4820980d3c2c1f2cce2f95e94f5e1c18" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2344
        • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
          "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.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:2256
          • C:\Windows\System32\tar.exe
            "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp9124.tmp" -C "C:\Users\Admin\AppData\Local\lcybndk48g"
            4⤵
              PID:4112
            • C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe
              "C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\lcybndk48g\torrc.txt"
              4⤵
              • Executes dropped EXE
              PID:2912
      • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:780
        • C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe
          "C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\lcybndk48g\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:3980
      • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2004
        • C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe
          "C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\lcybndk48g\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:2668
      • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1324
        • C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe
          "C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\lcybndk48g\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1400
      • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:920
        • C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe
          "C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\lcybndk48g\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:2576
      • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4048
        • C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe
          "C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\lcybndk48g\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:3784

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe.log

            • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe.log
            • Size 847B
            • SHA256 50a57273ecb794e53b0622eb841341e2643c11f53fa47356e6e754ab2268171d
            • MD5 SHA1 SHA512

            k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe

            • Path C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
            • Size 339KB
            • SHA256 d71329c78c704ee9cc7133761b5e738a315e7eb784e348d7743a8a7366724e9f
            • MD5 SHA1 SHA512 SSDEEP

            tmp9124.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\tmp9124.tmp
            • Size 13.3MB
            • SHA256 b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12
            • MD5 SHA1 SHA512 SSDEEP

            cached-microdesc-consensus

            • Path C:\Users\Admin\AppData\Local\lcybndk48g\data\cached-microdesc-consensus
            • Size 2.7MB
            • SHA256 60b43cdce0f807f7891521f396f53def34a7d98986dbde0faa2a197189c587f3
            • MD5 SHA1 SHA512 SSDEEP

            cached-microdescs.new

            • Path C:\Users\Admin\AppData\Local\lcybndk48g\data\cached-microdescs.new
            • Size 9.5MB
            • SHA256 627b41384dbf00956d7dbd26f6b2ddd89bf54a7cf4d017e5fa9d3c9e219e57c9
            • MD5 SHA1 SHA512 SSDEEP

            hostname

            • Path C:\Users\Admin\AppData\Local\lcybndk48g\host\hostname
            • Size 64B
            • SHA256 859467118a996a5d24f6aec25d62f58b38b05430007ff02cb6e8aced7c532c17
            • MD5 SHA1 SHA512

            port.dat

            • Path C:\Users\Admin\AppData\Local\lcybndk48g\port.dat
            • Size 4B
            • SHA256 5728c992e0c03fa48754a8636ffb192f1e2aa23f20be242c290d5eefd9b80182
            • MD5 SHA1 SHA512

            tor.exe

            • Path C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe
            • Size 7.4MB
            • SHA256 46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82
            • MD5 SHA1 SHA512 SSDEEP

            torrc.txt

            • Path C:\Users\Admin\AppData\Local\lcybndk48g\torrc.txt
            • Size 218B
            • SHA256 4bf74f12df627c9c41363c18b30549b1d2c810ad1b15f0f027bc5cf0ed4aa60f
            • MD5 SHA1 SHA512

            memory/244-1-0x00007FF9BECB0000-0x00007FF9BF772000-memory.dmp

            memory/244-2-0x000001EA79F50000-0x000001EA79F60000-memory.dmp

            memory/244-0-0x000001EA77900000-0x000001EA7795C000-memory.dmp

            memory/244-6-0x00007FF9BECB0000-0x00007FF9BF772000-memory.dmp

            memory/780-83-0x00007FF9BEAE0000-0x00007FF9BF5A2000-memory.dmp

            memory/780-76-0x000001DEDAEA0000-0x000001DEDAEB0000-memory.dmp

            memory/780-75-0x00007FF9BEAE0000-0x00007FF9BF5A2000-memory.dmp

            memory/920-114-0x0000022D4E470000-0x0000022D4E480000-memory.dmp

            memory/920-116-0x00007FF9BEAE0000-0x00007FF9BF5A2000-memory.dmp

            memory/920-113-0x00007FF9BEAE0000-0x00007FF9BF5A2000-memory.dmp

            memory/1324-103-0x00007FF9BEAE0000-0x00007FF9BF5A2000-memory.dmp

            memory/1324-101-0x00007FF9BEAE0000-0x00007FF9BF5A2000-memory.dmp

            memory/2004-91-0x00007FF9BEAE0000-0x00007FF9BF5A2000-memory.dmp

            memory/2004-89-0x00007FF9BEAE0000-0x00007FF9BF5A2000-memory.dmp

            memory/2256-12-0x0000023461BC0000-0x0000023461BD0000-memory.dmp

            memory/2256-73-0x0000023461BC0000-0x0000023461BD0000-memory.dmp

            memory/2256-72-0x00007FF9BEAE0000-0x00007FF9BF5A2000-memory.dmp

            memory/2256-11-0x00007FF9BEAE0000-0x00007FF9BF5A2000-memory.dmp

            memory/4048-126-0x00007FF9BEAE0000-0x00007FF9BF5A2000-memory.dmp

            memory/4048-128-0x00007FF9BEAE0000-0x00007FF9BF5A2000-memory.dmp