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
    294s
  • max time network
    300s
  • 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 02:37

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#.

  • Checks computer location settings 2 TTPs 7 IoCs

    Looks up country code configured in the registry, likely geofence.

  • 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 2 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⤵
    • Checks computer location settings
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:5068
    • 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:1848
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:4048
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:3860
        • 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:784
        • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
          "C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.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:5108
          • C:\Windows\System32\tar.exe
            "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp474A.tmp" -C "C:\Users\Admin\AppData\Local\lcybndk48g"
            4⤵
              PID:3840
            • 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:908
      • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1760
        • 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:4800
      • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2680
        • 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:3168
      • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2744
        • 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:4500
      • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3048
        • 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:2132
      • C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        C:\Users\Admin\AppData\Local\TeamViewer\k2fef4820980d3c2c1f2cce2f95e94f5e1c18.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4144
        • 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:4356

      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

        3308a84a40841fab7dfec198b3c31af7

        SHA1

        4e7ab6336c0538be5dd7da529c0265b3b6523083

        SHA256

        169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e

        SHA512

        97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198

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

        Filesize

        339KB

        MD5

        1cab66a5c15f97f040fb23d354d04a9c

        SHA1

        f0dbebd22b2c7bfedbefa4435b345c58416f9448

        SHA256

        d71329c78c704ee9cc7133761b5e738a315e7eb784e348d7743a8a7366724e9f

        SHA512

        a5508a75a0a7c747cc50fe8284b9097e1cb9ae83bd7e80553ffa875a6d07d6eec7fc18f66a0a328aa0614c26642d884bfe152e6c09a11eeb0d64f6be66064eab

      • C:\Users\Admin\AppData\Local\Temp\tmp474A.tmp

        Filesize

        13.3MB

        MD5

        89d2d5811c1aff539bb355f15f3ddad0

        SHA1

        5bb3577c25b6d323d927200c48cd184a3e27c873

        SHA256

        b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12

        SHA512

        39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289

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

        Filesize

        2.7MB

        MD5

        a0db8a87f7b723266c8b04255da46b06

        SHA1

        4df00ea56d22d88f3d2e005ef66bad5b3ef92ebf

        SHA256

        60b43cdce0f807f7891521f396f53def34a7d98986dbde0faa2a197189c587f3

        SHA512

        41b8fc467d11af7ca6a42c7e94d1b8295ab3ae5d6d186b4f378e6e079440520e8324b695da1134beb2bc1697d2491edcc70c1b75ab6fc66b9c1cb2ecbcdb4a7d

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

        Filesize

        5.6MB

        MD5

        1320859a90f527c8c17eac4939de4e01

        SHA1

        d0903113ba7960010b7166c9a3b47cd76dd131a8

        SHA256

        dc627a885f3faab3322d9d17a8261ed3a40365cf28c062a1e8da8154c4b5c532

        SHA512

        a3b654865e3234f3b3f455bb692cc0446d12c2f38b4bba5516d51fa5a2d3cfc94148b41f6956ad3802a45114fd2a7bc4d85e543c6b185b70f5374077f65a992b

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

        Filesize

        64B

        MD5

        ca303af46bbb6b69d7140517b3d5d839

        SHA1

        a46430a5ffcc4925a37cc27506e4cffad89af686

        SHA256

        8b57e7c1cefb6a42eb9026e8b0400bcdcbec1eb2c9b61ccb9b7b5be22e3400f0

        SHA512

        74b77b493844842b3db9a6e6a06bd9b9485554dc315a84f930000229b2b72fa9a4510b124ea0a38217e214b252b6d584763298a01994d8375a5459fa8752d114

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

        Filesize

        4B

        MD5

        477b02d99dd6c00c5ba852bb9a9e1f6c

        SHA1

        8ff080f8aba1bd4557bf641b3684c8e5ec346bff

        SHA256

        5e9c1dc390130fae4c554b404584876f78f329a1c59b969a07b8af114f1ad880

        SHA512

        01ea601905f7df8805fa110c3611923834faec242ecfe5fb986bc26281c15bb907c99d12c89d6fb5f999bbe88f7c1cbfb93b46976c3553fa82773ed8cea87e52

      • 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

        97bb57a16db118d83586045954c760cd

        SHA1

        7bc1c958341ae1c7c7807f65d281cf425758719b

        SHA256

        82fec45cae1f37a90e1f77ac6ae935fadea37173df9a6f3a9b0193ed64d59820

        SHA512

        5e52e83c5db1f1768540b9a535e68581ec840d137b045b412678c10a99406f80357a8ac4fddb481d5b5b3e68d267a14a21c7c830d4ffc97c992aa0a631dfa3b1

      • memory/1760-75-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp

        Filesize

        10.8MB

      • memory/1760-76-0x0000022AA41A0000-0x0000022AA41B0000-memory.dmp

        Filesize

        64KB

      • memory/1760-79-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp

        Filesize

        10.8MB

      • memory/2680-91-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp

        Filesize

        10.8MB

      • memory/2680-89-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp

        Filesize

        10.8MB

      • memory/2744-100-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp

        Filesize

        10.8MB

      • memory/2744-98-0x00000188FE840000-0x00000188FE850000-memory.dmp

        Filesize

        64KB

      • memory/2744-97-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp

        Filesize

        10.8MB

      • memory/3048-104-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp

        Filesize

        10.8MB

      • memory/3048-102-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp

        Filesize

        10.8MB

      • memory/4144-116-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp

        Filesize

        10.8MB

      • memory/4144-114-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp

        Filesize

        10.8MB

      • memory/5068-6-0x00007FFB18360000-0x00007FFB18E21000-memory.dmp

        Filesize

        10.8MB

      • memory/5068-1-0x00007FFB18360000-0x00007FFB18E21000-memory.dmp

        Filesize

        10.8MB

      • memory/5068-4-0x0000013DC4660000-0x0000013DC4670000-memory.dmp

        Filesize

        64KB

      • memory/5068-0-0x0000013DA9FB0000-0x0000013DAA00C000-memory.dmp

        Filesize

        368KB

      • memory/5108-12-0x000001EB61550000-0x000001EB61560000-memory.dmp

        Filesize

        64KB

      • memory/5108-50-0x000001EB61550000-0x000001EB61560000-memory.dmp

        Filesize

        64KB

      • memory/5108-48-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp

        Filesize

        10.8MB

      • memory/5108-11-0x00007FFB17280000-0x00007FFB17D41000-memory.dmp

        Filesize

        10.8MB