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
    591s
  • max time network
    603s
  • 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 02:48

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#.

  • Executes dropped EXE 22 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 12 IoCs
  • Suspicious use of WriteProcessMemory 34 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⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2440
    • 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:776
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2812
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:4864
        • 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:3928
        • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
          "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.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:2936
          • C:\Windows\System32\tar.exe
            "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp4B41.tmp" -C "C:\Users\Admin\AppData\Local\gzrj1xdnai"
            4⤵
              PID:1528
            • 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:3880
      • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1040
        • 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:1256
      • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4480
        • 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:2824
      • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4024
        • 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:1612
      • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:588
        • 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:2692
      • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1728
        • 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:1912
      • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2924
        • 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:3320
      • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3408
        • 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:4064
      • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2292
        • 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:2116
      • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1940
        • 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:844
      • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2028
        • 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:3560

      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

        486ebddc86ea8b3e965d390d22283a23

        SHA1

        eaffc047f067084867e8575c576a9ec60e094ba8

        SHA256

        50a57273ecb794e53b0622eb841341e2643c11f53fa47356e6e754ab2268171d

        SHA512

        0a50ba02250b38355a6f4fb94e40c61258a74031d9aea7cdf675f3e068f39ec0748ecf292aaf2f94b1963b9d66516ee79aa6c552617048e248774af0ff07189d

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

        Filesize

        530KB

        MD5

        862e7aeb18ba5892f51b5712a213a614

        SHA1

        99d86e4247f52c3ea9b2bb476af66dfc7707fa8d

        SHA256

        44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31

        SHA512

        678fc8fb5dc887f41db90e6341229ce35c830ffac4cbb91ea669ab5e8bc849bae05c15909ae62e4dfd3a249bb2ff062eaa0e256989fe203863db0396c60ec713

      • C:\Users\Admin\AppData\Local\Temp\tmp4B41.tmp

        Filesize

        13.3MB

        MD5

        89d2d5811c1aff539bb355f15f3ddad0

        SHA1

        5bb3577c25b6d323d927200c48cd184a3e27c873

        SHA256

        b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12

        SHA512

        39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289

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

        Filesize

        2.6MB

        MD5

        8155dd4a16697830a63d507d2666b2a9

        SHA1

        e07a54b15c905cd1d9d41db3ccde3bade36bcdb4

        SHA256

        6b4f443629c32b632d8ad7bcb17d84da1e4eaec556dccdf98c5e9051cb404fed

        SHA512

        0cb6c3fa12cbe7f8e63c5c73c0665fc2593109801ba318c582c4bd1c14dfd27fff3252c22b9078040e743ec788ad9534856c72ca5e38d992d9cb5aeacf819e6f

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

        Filesize

        7.8MB

        MD5

        42680acb5b722d31206254ef781b2434

        SHA1

        9b5d9a19e287858adeb30df12847c84aa208d8f4

        SHA256

        b39e48e5b159ca3f7dc5fb51583493ddc1260fd1df0f22ecc054a34cd6b6213c

        SHA512

        1b92ba80cb98afbf4adb4f2dc3d0cc499e92089dba3b480168f00659e5d7966499f93e747b76f29ffff30648c9c9425591efacc6239d07dd10dd93cc405bd4d4

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

        Filesize

        64B

        MD5

        78a08af3d56f27a82b8493e74f362eac

        SHA1

        d706f631acaceccbc539329888afb6b3f3756d56

        SHA256

        01fe4993b4297f47a4d15e237c7d071b7adb0d3c971128a8e583547609981158

        SHA512

        e160379a5d42e0b8b96c3e8cf17b13bcf3047ec33a9e8efc5594fbd32fdd91e5a1eb2ef7ef42f486b9c364cbe5b13d94c0174d8bec839336d6b18c642ceb5cf4

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

        Filesize

        4B

        MD5

        49ef08ad6e7f26d7f200e1b2b9e6e4ac

        SHA1

        7e06c1fd759ac5b6978e692a2b7e433cb83982bb

        SHA256

        dd5744ec739737eec7efcca1f0bf99bb5a1c894f565db45a64622ffb4f61f61a

        SHA512

        b6590f933796bfb81219f629ae0f8f1795121bd725c2f4ea90d882fa1af7291887f619da149a21233c9f1c9e86a037f6ace5ed6340112c5131575b11463c992d

      • 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

        17dda0b8a79be1c5108dea86085c39e6

        SHA1

        1aa95f97cc353ab7174244e2a30b1204961b20e1

        SHA256

        bc7832eb19dc2e369eef572ee21612deaedc8fc70f1716291fc50f827ddb94e9

        SHA512

        6f069619731b0054d90df566e06ccfcc24f005caa8f04ca5d7924cf143521e47fa10c34d9e97aaa2ade5eb6cd0239ac7d66941c6544cc4c560456de0cf1d6609

      • memory/588-112-0x0000026864BA0000-0x0000026864BB0000-memory.dmp

        Filesize

        64KB

      • memory/588-114-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/588-111-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/1040-75-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/1040-71-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/1040-72-0x0000026F7C2A0000-0x0000026F7C2B0000-memory.dmp

        Filesize

        64KB

      • memory/1728-124-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/1728-127-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/1728-125-0x000001F17D1C0000-0x000001F17D1D0000-memory.dmp

        Filesize

        64KB

      • memory/1940-169-0x000001DCF3D40000-0x000001DCF3D50000-memory.dmp

        Filesize

        64KB

      • memory/1940-171-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/1940-168-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/2028-178-0x000001D1C09C0000-0x000001D1C09D0000-memory.dmp

        Filesize

        64KB

      • memory/2028-177-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/2028-180-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/2292-154-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/2292-151-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/2292-152-0x000001FF212B0000-0x000001FF212C0000-memory.dmp

        Filesize

        64KB

      • memory/2440-0-0x00000172E09C0000-0x00000172E0A4A000-memory.dmp

        Filesize

        552KB

      • memory/2440-6-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/2440-2-0x00000172FB060000-0x00000172FB070000-memory.dmp

        Filesize

        64KB

      • memory/2440-1-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/2924-138-0x0000022BFF360000-0x0000022BFF370000-memory.dmp

        Filesize

        64KB

      • memory/2924-140-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/2924-137-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/2936-55-0x000001B539270000-0x000001B539280000-memory.dmp

        Filesize

        64KB

      • memory/2936-11-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/2936-12-0x000001B539270000-0x000001B539280000-memory.dmp

        Filesize

        64KB

      • memory/2936-48-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/3408-143-0x0000028EA4390000-0x0000028EA43A0000-memory.dmp

        Filesize

        64KB

      • memory/3408-142-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/3408-145-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/4024-98-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/4024-99-0x000001A8EE9A0000-0x000001A8EE9B0000-memory.dmp

        Filesize

        64KB

      • memory/4024-101-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/4480-89-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB

      • memory/4480-90-0x0000016B4C3D0000-0x0000016B4C3E0000-memory.dmp

        Filesize

        64KB

      • memory/4480-92-0x00007FFEE08A0000-0x00007FFEE1362000-memory.dmp

        Filesize

        10.8MB