Resubmissions

10-04-2024 02:49

240410-da1n1sfe7v 10

10-04-2024 02:49

240410-daz3gscc34 10

10-04-2024 02:48

240410-dazfyscc32 10

10-04-2024 02:48

240410-dayvesfe7s 10

14-10-2023 03:45

231014-ea62gage69 10

Analysis

  • max time kernel
    298s
  • 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 02:48

General

  • Target

    B9a5797cb584014f3fede.exe

  • Size

    530KB

  • MD5

    862e7aeb18ba5892f51b5712a213a614

  • SHA1

    99d86e4247f52c3ea9b2bb476af66dfc7707fa8d

  • SHA256

    44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31

  • SHA512

    678fc8fb5dc887f41db90e6341229ce35c830ffac4cbb91ea669ab5e8bc849bae05c15909ae62e4dfd3a249bb2ff062eaa0e256989fe203863db0396c60ec713

  • SSDEEP

    6144:XHClm6SWPoK5Z0EwVSmRPQd/t/a2zDGVPJXvnzZjDJHb571Kjn1929XDccHd8JyO:XHCnZxb88RatpvnzZjDv7oj19yTNTY

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot6176004110:AAFKA5be4dMwA848HWxzYIzrzzOGIHMOJGc/sendMessage?chat_id=615133582

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
  • 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 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\B9a5797cb584014f3fede.exe
    "C:\Users\Admin\AppData\Local\Temp\B9a5797cb584014f3fede.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3236
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "B9a5797cb584014f3fede" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\B9a5797cb584014f3fede.exe" &&START "" "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:372
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2368
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2392
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "B9a5797cb584014f3fede" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2632
        • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
          "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.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:4920
          • C:\Windows\System32\tar.exe
            "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp3548.tmp" -C "C:\Users\Admin\AppData\Local\gzrj1xdnai"
            4⤵
              PID:2856
            • C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe
              "C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\gzrj1xdnai\torrc.txt"
              4⤵
              • Executes dropped EXE
              PID:4676
      • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3652
        • C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe
          "C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\gzrj1xdnai\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:2052
      • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4856
        • C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe
          "C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\gzrj1xdnai\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:216
      • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4980
        • C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe
          "C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\gzrj1xdnai\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:4876
      • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3224
        • C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe
          "C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\gzrj1xdnai\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:660
      • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:5024
        • C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe
          "C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\gzrj1xdnai\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:3580

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\B9a5797cb584014f3fede.exe.log

        Filesize

        847B

        MD5

        3308a84a40841fab7dfec198b3c31af7

        SHA1

        4e7ab6336c0538be5dd7da529c0265b3b6523083

        SHA256

        169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e

        SHA512

        97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198

      • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe

        Filesize

        530KB

        MD5

        862e7aeb18ba5892f51b5712a213a614

        SHA1

        99d86e4247f52c3ea9b2bb476af66dfc7707fa8d

        SHA256

        44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31

        SHA512

        678fc8fb5dc887f41db90e6341229ce35c830ffac4cbb91ea669ab5e8bc849bae05c15909ae62e4dfd3a249bb2ff062eaa0e256989fe203863db0396c60ec713

      • C:\Users\Admin\AppData\Local\Temp\tmp3548.tmp

        Filesize

        13.3MB

        MD5

        89d2d5811c1aff539bb355f15f3ddad0

        SHA1

        5bb3577c25b6d323d927200c48cd184a3e27c873

        SHA256

        b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12

        SHA512

        39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289

      • C:\Users\Admin\AppData\Local\gzrj1xdnai\data\cached-microdesc-consensus.tmp

        Filesize

        2.7MB

        MD5

        a0db8a87f7b723266c8b04255da46b06

        SHA1

        4df00ea56d22d88f3d2e005ef66bad5b3ef92ebf

        SHA256

        60b43cdce0f807f7891521f396f53def34a7d98986dbde0faa2a197189c587f3

        SHA512

        41b8fc467d11af7ca6a42c7e94d1b8295ab3ae5d6d186b4f378e6e079440520e8324b695da1134beb2bc1697d2491edcc70c1b75ab6fc66b9c1cb2ecbcdb4a7d

      • C:\Users\Admin\AppData\Local\gzrj1xdnai\data\cached-microdescs.new

        Filesize

        9.1MB

        MD5

        42e51f2ee140bc989a81fb6a0f7e8c71

        SHA1

        237d4ff6a6c2b927fe30a4936752284f79d11746

        SHA256

        b8d471bc2dd3d8c1e64ada2157df8c381b28c56aa8c82fd9f6bd1ad77f576a81

        SHA512

        75f418feef003c4ee1277c2b291f3e608824acb95574e3e5e17a3f80904576211d650cb3389156cca0f39d256e9afac2ed5e0eba97c6138e78a36e5dac1733b4

      • C:\Users\Admin\AppData\Local\gzrj1xdnai\host\hostname

        Filesize

        64B

        MD5

        a9a05a3def7e31f9309939081d8899d8

        SHA1

        5ff2471bc5e2e6bb5029c995fab0966cba58aab7

        SHA256

        00d7dddc5c1ce8b10d179767a2a80a1708307450fd3ffe4c9cb25a32a2b88273

        SHA512

        b3e78e444dc374237af5af4bda74fa5383da1c671d4c6d6e5e40369e439535d78f6d1149f19c17fc5eb1ee455401233ba8db5f4512636a332e120e8fd07d20ca

      • C:\Users\Admin\AppData\Local\gzrj1xdnai\port.dat

        Filesize

        4B

        MD5

        9ca8c9b0996bbf05ae7753d34667a6fd

        SHA1

        d574c24b623c1073a5b9a332b77a7ca39d4f4df4

        SHA256

        d5c4f67a138cbcbcf840e8f78ce5280fc4f07beaf61c725ef109c8da727c3fd4

        SHA512

        b73f536f1579770deca118642004516d62deed6e4abca66cde2e498654351a5d8385123e9886a16d6a3050a11845e74a4c536a88f2dbfb8c852e040476f1bda3

      • C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe

        Filesize

        7.4MB

        MD5

        88590909765350c0d70c6c34b1f31dd2

        SHA1

        129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

        SHA256

        46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

        SHA512

        a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

      • C:\Users\Admin\AppData\Local\gzrj1xdnai\torrc.txt

        Filesize

        218B

        MD5

        cf5fef09135c72361ba52212d7ec8aed

        SHA1

        77792b0f57fd9ca302e3ae384c98a2440827a8ba

        SHA256

        97c65575e2ad5dd3a913cf69a14340b74ed4468a2879b8f1f4dd0552b938fed6

        SHA512

        3180f5b66af85580852d5ca5219b2b41b6e2b529a4976befed096b45ca6e79676214e66812524ab0fe01f3e9493db425abbcb48c9119764254b524a534dea36d

      • memory/3224-136-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp

        Filesize

        10.8MB

      • memory/3224-135-0x00000225A8B60000-0x00000225A8C62000-memory.dmp

        Filesize

        1.0MB

      • memory/3224-133-0x00000225A8910000-0x00000225A8920000-memory.dmp

        Filesize

        64KB

      • memory/3224-132-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp

        Filesize

        10.8MB

      • memory/3236-0-0x000002026D4D0000-0x000002026D55A000-memory.dmp

        Filesize

        552KB

      • memory/3236-6-0x00007FFDB6630000-0x00007FFDB70F1000-memory.dmp

        Filesize

        10.8MB

      • memory/3236-1-0x00007FFDB6630000-0x00007FFDB70F1000-memory.dmp

        Filesize

        10.8MB

      • memory/3236-2-0x000002026D980000-0x000002026D990000-memory.dmp

        Filesize

        64KB

      • memory/3652-79-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp

        Filesize

        10.8MB

      • memory/3652-80-0x00000162C09D0000-0x00000162C09E0000-memory.dmp

        Filesize

        64KB

      • memory/3652-83-0x00000162C09F0000-0x00000162C0AF2000-memory.dmp

        Filesize

        1.0MB

      • memory/3652-84-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp

        Filesize

        10.8MB

      • memory/4856-108-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp

        Filesize

        10.8MB

      • memory/4856-104-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp

        Filesize

        10.8MB

      • memory/4856-105-0x00000239C9900000-0x00000239C9910000-memory.dmp

        Filesize

        64KB

      • memory/4856-107-0x00000239C9B40000-0x00000239C9C42000-memory.dmp

        Filesize

        1.0MB

      • memory/4920-56-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp

        Filesize

        10.8MB

      • memory/4920-67-0x0000020C9A360000-0x0000020C9A370000-memory.dmp

        Filesize

        64KB

      • memory/4920-42-0x0000020C9A370000-0x0000020C9A472000-memory.dmp

        Filesize

        1.0MB

      • memory/4920-12-0x0000020C9A360000-0x0000020C9A370000-memory.dmp

        Filesize

        64KB

      • memory/4920-11-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp

        Filesize

        10.8MB

      • memory/4980-120-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp

        Filesize

        10.8MB

      • memory/4980-121-0x000002BB747D0000-0x000002BB747E0000-memory.dmp

        Filesize

        64KB

      • memory/4980-123-0x000002BB75240000-0x000002BB75342000-memory.dmp

        Filesize

        1.0MB

      • memory/4980-124-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp

        Filesize

        10.8MB

      • memory/5024-152-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp

        Filesize

        10.8MB

      • memory/5024-155-0x00007FFDB50E0000-0x00007FFDB5BA1000-memory.dmp

        Filesize

        10.8MB

      • memory/5024-154-0x000001F32FC70000-0x000001F32FD72000-memory.dmp

        Filesize

        1.0MB