Resubmissions

10-04-2024 02:38

240410-c4pceacb24 10

10-04-2024 02:37

240410-c4ne4scb23 10

10-04-2024 02:37

240410-c4llhsca99 10

10-04-2024 02:37

240410-c4jf6aca98 10

14-10-2023 01:31

231014-bxezqahg8w 10

Analysis

  • max time kernel
    677s
  • max time network
    1204s
  • 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

  • MD5

    1cab66a5c15f97f040fb23d354d04a9c

  • SHA1

    f0dbebd22b2c7bfedbefa4435b345c58416f9448

  • SHA256

    d71329c78c704ee9cc7133761b5e738a315e7eb784e348d7743a8a7366724e9f

  • SHA512

    a5508a75a0a7c747cc50fe8284b9097e1cb9ae83bd7e80553ffa875a6d07d6eec7fc18f66a0a328aa0614c26642d884bfe152e6c09a11eeb0d64f6be66064eab

  • SSDEEP

    3072:gdrpN/JlLKd5hkad0lk0vGJGMlngDBXrkhamyeFykt9sxc8eTRLUvenjLM/zNlgl:0UGPUvva+lxXY6uXAJMI9bAV0D

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 24 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 13 IoCs
  • Suspicious use of WriteProcessMemory 36 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:2796
    • 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:2576
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:1556
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:4392
        • 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:3808
        • 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:3328
          • C:\Windows\System32\tar.exe
            "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmpAA1B.tmp" -C "C:\Users\Admin\AppData\Local\lcybndk48g"
            4⤵
              PID:5024
            • 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:4368
      • 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:4108
        • 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:1664
      • 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:4060
        • 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:4796
      • 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:4360
        • 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:2920
      • 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:4172
        • 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:4920
      • 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:556
        • 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:1156
      • 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:1984
        • 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:4080
      • 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:3940
        • 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:4608
      • 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:2732
        • 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:2396
      • 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:2116
        • 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:1648
      • 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:1920
        • 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:4380
      • 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:2944
        • 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:1904

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe.log

        Filesize

        847B

        MD5

        486ebddc86ea8b3e965d390d22283a23

        SHA1

        eaffc047f067084867e8575c576a9ec60e094ba8

        SHA256

        50a57273ecb794e53b0622eb841341e2643c11f53fa47356e6e754ab2268171d

        SHA512

        0a50ba02250b38355a6f4fb94e40c61258a74031d9aea7cdf675f3e068f39ec0748ecf292aaf2f94b1963b9d66516ee79aa6c552617048e248774af0ff07189d

      • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe

        Filesize

        339KB

        MD5

        1cab66a5c15f97f040fb23d354d04a9c

        SHA1

        f0dbebd22b2c7bfedbefa4435b345c58416f9448

        SHA256

        d71329c78c704ee9cc7133761b5e738a315e7eb784e348d7743a8a7366724e9f

        SHA512

        a5508a75a0a7c747cc50fe8284b9097e1cb9ae83bd7e80553ffa875a6d07d6eec7fc18f66a0a328aa0614c26642d884bfe152e6c09a11eeb0d64f6be66064eab

      • C:\Users\Admin\AppData\Local\Temp\tmpAA1B.tmp

        Filesize

        13.3MB

        MD5

        89d2d5811c1aff539bb355f15f3ddad0

        SHA1

        5bb3577c25b6d323d927200c48cd184a3e27c873

        SHA256

        b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12

        SHA512

        39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289

      • C:\Users\Admin\AppData\Local\lcybndk48g\data\cached-microdesc-consensus

        Filesize

        2.7MB

        MD5

        a0db8a87f7b723266c8b04255da46b06

        SHA1

        4df00ea56d22d88f3d2e005ef66bad5b3ef92ebf

        SHA256

        60b43cdce0f807f7891521f396f53def34a7d98986dbde0faa2a197189c587f3

        SHA512

        41b8fc467d11af7ca6a42c7e94d1b8295ab3ae5d6d186b4f378e6e079440520e8324b695da1134beb2bc1697d2491edcc70c1b75ab6fc66b9c1cb2ecbcdb4a7d

      • C:\Users\Admin\AppData\Local\lcybndk48g\data\cached-microdescs.new

        Filesize

        10.9MB

        MD5

        7c6a1342ae6c9242f6b6a2e3551924f6

        SHA1

        5004a3ea4bd0e42509819e5e3628ce5b23de9732

        SHA256

        ca28b25a19afb8d9536e37db85fb3f0f615b449439afa773cfec4c7297bf9b4f

        SHA512

        98b53004de6235f82a0084a6a6d9549d8501b685612522d357ff87f3d104b5a2c2c00c500b8e434d1d473f5fce771167b26df684a83662e0277a7bcc487cbf76

      • C:\Users\Admin\AppData\Local\lcybndk48g\host\hostname

        Filesize

        64B

        MD5

        60ff8d283e87ec71733ec946f649e8ea

        SHA1

        8f7c989564ba2cb0d028140e9c5364cad2a9e24f

        SHA256

        b81cb4ab7d695f0b65023a039767e7667d8f92e21dffb73eefc72e13a95f2b06

        SHA512

        eb0b1ff07be8f82614f579dfe2c2fbd794c50e499df8eb86b7514e4e7fcbb7daecf672e13a63ace6baaaefe8d5e95097d289d484d6d1a19345176d888d246d57

      • C:\Users\Admin\AppData\Local\lcybndk48g\port.dat

        Filesize

        4B

        MD5

        d69116f8b0140cdeb1f99a4d5096ffe4

        SHA1

        ad03acdbc8424b19ed0d8ca4b9db2de80d300c01

        SHA256

        ea2c89be738f88dc66d4d88f4448a99df5f2f85bd94158fc29ed46fd481dcf34

        SHA512

        5ac97c2206d95acd6fca42edd0ef7efc9dcbb357650dd655f78c0d30683c372e60f3c1625b284185926c03e7a1057579ba1315b666fbb2867ec063fda332dce4

      • C:\Users\Admin\AppData\Local\lcybndk48g\tor\tor.exe

        Filesize

        7.4MB

        MD5

        88590909765350c0d70c6c34b1f31dd2

        SHA1

        129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

        SHA256

        46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

        SHA512

        a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

      • C:\Users\Admin\AppData\Local\lcybndk48g\torrc.txt

        Filesize

        218B

        MD5

        a7d279126e581911051af5decf8e557c

        SHA1

        16033f48ca47c56be38df670e77a64d2fd3555dd

        SHA256

        147066f94e79a5f3eb0ea0c2b5c45176fb30a690ea66fbd339bd01775de81507

        SHA512

        430900eddad91dd5f65636541232126da37a31957cb6e9d4b64b5d455d6d54ded8f2ca5760d9f238d132515196a17e9e5a1208a97e77e5947956e3c64e17614c

      • memory/556-117-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/556-115-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/1920-163-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/1920-165-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/1984-127-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/1984-129-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/2116-153-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/2116-151-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/2732-137-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/2732-135-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/2796-6-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/2796-1-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/2796-2-0x0000019CEE210000-0x0000019CEE220000-memory.dmp

        Filesize

        64KB

      • memory/2796-0-0x0000019CD3950000-0x0000019CD39AC000-memory.dmp

        Filesize

        368KB

      • memory/2944-169-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/2944-167-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/3328-11-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/3328-12-0x000001CF34E40000-0x000001CF34E50000-memory.dmp

        Filesize

        64KB

      • memory/3328-63-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/3328-64-0x000001CF34E40000-0x000001CF34E50000-memory.dmp

        Filesize

        64KB

      • memory/3940-131-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/3940-133-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/4060-96-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/4060-90-0x0000025856930000-0x0000025856940000-memory.dmp

        Filesize

        64KB

      • memory/4060-89-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/4108-55-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/4108-62-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/4108-57-0x000001A73FB40000-0x000001A73FB50000-memory.dmp

        Filesize

        64KB

      • memory/4172-107-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/4172-109-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/4360-102-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB

      • memory/4360-103-0x000001B8B26D0000-0x000001B8B26E0000-memory.dmp

        Filesize

        64KB

      • memory/4360-105-0x00007FFDD4470000-0x00007FFDD4F32000-memory.dmp

        Filesize

        10.8MB