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Resubmissions

10/04/2024, 02:41

240410-c6hmmsfd7z 10

10/04/2024, 02:41

240410-c6g14scb46 10

10/04/2024, 02:41

240410-c6gqcacb45 10

10/04/2024, 02:41

240410-c6f4tacb44 10

14/10/2023, 01:33

231014-bysbfahh6s 10

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, 02:41

General

  • Target

    x19a4f9f3d16fcc9779ba8ea79bf7.exe

  • Size

    392KB

  • MD5

    2299a17350433284e58bd0fcc10edf41

  • SHA1

    d477f1cd55365db00ca77cc5459afabe1ffc80b3

  • SHA256

    c3439dd56bcf3921cdbfcbdff3f928d14ebd632b3411235657bf9f5452c1ab9d

  • SHA512

    123d18cf17b4bb0f0b16414039c2381f77e9f12c96a109d5847c760e4d7fb64f6c592f8f185a4c0375aade6754afd0abd6a196936adac405290f157829ae25a1

  • SSDEEP

    6144:5cJGLvLE5hu6Me646G0D1ecme1x9b31v4n:uUvLr6k9b5ecmed1v4

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\x19a4f9f3d16fcc9779ba8ea79bf7.exe
    "C:\Users\Admin\AppData\Local\Temp\x19a4f9f3d16fcc9779ba8ea79bf7.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1052
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "x19a4f9f3d16fcc9779ba8ea79bf7" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\x19a4f9f3d16fcc9779ba8ea79bf7.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:872
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:4916
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2284
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "x19a4f9f3d16fcc9779ba8ea79bf7" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:1020
        • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
          "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.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:4160
          • C:\Windows\System32\tar.exe
            "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp81C3.tmp" -C "C:\Users\Admin\AppData\Local\xtioxntk7k"
            4⤵
              PID:4704
            • C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe
              "C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\xtioxntk7k\torrc.txt"
              4⤵
              • Executes dropped EXE
              PID:4808
      • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4980
        • C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe
          "C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\xtioxntk7k\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:5048
      • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3364
        • C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe
          "C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\xtioxntk7k\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:432
      • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4988
        • C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe
          "C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\xtioxntk7k\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1832
      • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:424
        • C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe
          "C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\xtioxntk7k\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:2396
      • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3756
        • C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe
          "C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\xtioxntk7k\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:432

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\x19a4f9f3d16fcc9779ba8ea79bf7.exe.log

        Filesize

        847B

        MD5

        486ebddc86ea8b3e965d390d22283a23

        SHA1

        eaffc047f067084867e8575c576a9ec60e094ba8

        SHA256

        50a57273ecb794e53b0622eb841341e2643c11f53fa47356e6e754ab2268171d

        SHA512

        0a50ba02250b38355a6f4fb94e40c61258a74031d9aea7cdf675f3e068f39ec0748ecf292aaf2f94b1963b9d66516ee79aa6c552617048e248774af0ff07189d

      • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe

        Filesize

        392KB

        MD5

        2299a17350433284e58bd0fcc10edf41

        SHA1

        d477f1cd55365db00ca77cc5459afabe1ffc80b3

        SHA256

        c3439dd56bcf3921cdbfcbdff3f928d14ebd632b3411235657bf9f5452c1ab9d

        SHA512

        123d18cf17b4bb0f0b16414039c2381f77e9f12c96a109d5847c760e4d7fb64f6c592f8f185a4c0375aade6754afd0abd6a196936adac405290f157829ae25a1

      • C:\Users\Admin\AppData\Local\Temp\tmp81C3.tmp

        Filesize

        13.3MB

        MD5

        89d2d5811c1aff539bb355f15f3ddad0

        SHA1

        5bb3577c25b6d323d927200c48cd184a3e27c873

        SHA256

        b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12

        SHA512

        39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289

      • C:\Users\Admin\AppData\Local\xtioxntk7k\data\cached-microdesc-consensus

        Filesize

        2.7MB

        MD5

        a0db8a87f7b723266c8b04255da46b06

        SHA1

        4df00ea56d22d88f3d2e005ef66bad5b3ef92ebf

        SHA256

        60b43cdce0f807f7891521f396f53def34a7d98986dbde0faa2a197189c587f3

        SHA512

        41b8fc467d11af7ca6a42c7e94d1b8295ab3ae5d6d186b4f378e6e079440520e8324b695da1134beb2bc1697d2491edcc70c1b75ab6fc66b9c1cb2ecbcdb4a7d

      • C:\Users\Admin\AppData\Local\xtioxntk7k\data\cached-microdescs.new

        Filesize

        8.4MB

        MD5

        0952a8705afa7f027d1ffbd69e39abf7

        SHA1

        ab61d8104c5d9c2c138163d8a58deef787ea2ef5

        SHA256

        b8c75ca17a79f3c95bd9aa1c7dd637647c67b78fa5e4f2d651121f84f3dfc835

        SHA512

        608f6707ae1e48ba1d707d3f874590c97a24309c33b1032d2f7bc74f6bfdeecc840467270988bfabe803984141c50f624b944937b060eb0f4a72d1ae1af78fb7

      • C:\Users\Admin\AppData\Local\xtioxntk7k\host\hostname

        Filesize

        64B

        MD5

        03dcf5f5cdf990737b8aebe998025dd1

        SHA1

        5cea26039b79bc95763ae7c3c4d6b49a250144fe

        SHA256

        ade34f1def90b849b72827918510d551089bc351852cc44bbc2b99fb9943de75

        SHA512

        3bdcda39efa810cdb4e4a7d314a973507bcb25c2d99a813aac6950ecfc9d7dc751b2720ee458874697d5ab394d8cc8b60fed5962b98a1926e1d2cc552e1c97d4

      • C:\Users\Admin\AppData\Local\xtioxntk7k\port.dat

        Filesize

        4B

        MD5

        9a86d531e19ec6f5937ad1373bb118bd

        SHA1

        9491531157806078a1ce2da9ab6ff7e33761d86f

        SHA256

        b8e5918871d490fedab8e3b8de116e80b2cdd5c5b3027d927853cea5b279d19d

        SHA512

        75093d0afd2265b66dfda5c4dac853b7c703594411d67c83f8f420994005bf2078061fe7219fe7682ebb40951dbb488f8c9d627520e783dced24a6afd879f9cc

      • C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe

        Filesize

        7.4MB

        MD5

        88590909765350c0d70c6c34b1f31dd2

        SHA1

        129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

        SHA256

        46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

        SHA512

        a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

      • C:\Users\Admin\AppData\Local\xtioxntk7k\torrc.txt

        Filesize

        218B

        MD5

        51ffb85541f98f1bb444875dd66eacfc

        SHA1

        3faac1a020f8f35889529baca1bffd373c9a7b83

        SHA256

        a9ec09359c190fc186eecff5ec3a8f796ac5e6d9d196c867c0fa4941de24a8e4

        SHA512

        693c9910cf81f4265678f9aa9648d1b867947634613f726d37947cee1e9020fc452cf1cc7bbf2adc6224a91bc10f3e287b30875f3f98d1241ecabe325bb4e613

      • memory/424-111-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

        Filesize

        10.8MB

      • memory/424-109-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

        Filesize

        10.8MB

      • memory/1052-0-0x0000015CA5AA0000-0x0000015CA5B08000-memory.dmp

        Filesize

        416KB

      • memory/1052-6-0x00007FF9929D0000-0x00007FF993492000-memory.dmp

        Filesize

        10.8MB

      • memory/1052-2-0x0000015CC02E0000-0x0000015CC02F0000-memory.dmp

        Filesize

        64KB

      • memory/1052-1-0x00007FF9929D0000-0x00007FF993492000-memory.dmp

        Filesize

        10.8MB

      • memory/3364-93-0x000001BBA49D0000-0x000001BBA49E0000-memory.dmp

        Filesize

        64KB

      • memory/3364-95-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

        Filesize

        10.8MB

      • memory/3364-92-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

        Filesize

        10.8MB

      • memory/3756-123-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

        Filesize

        10.8MB

      • memory/3756-121-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

        Filesize

        10.8MB

      • memory/4160-12-0x000001FA1FEC0000-0x000001FA1FED0000-memory.dmp

        Filesize

        64KB

      • memory/4160-76-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

        Filesize

        10.8MB

      • memory/4160-11-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

        Filesize

        10.8MB

      • memory/4980-86-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

        Filesize

        10.8MB

      • memory/4980-84-0x00000168A7320000-0x00000168A7330000-memory.dmp

        Filesize

        64KB

      • memory/4980-82-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

        Filesize

        10.8MB

      • memory/4988-105-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

        Filesize

        10.8MB

      • memory/4988-107-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

        Filesize

        10.8MB