Resubmissions

10-04-2024 02:58

240410-dgn9kacd46 10

10-04-2024 02:58

240410-dgnm2aff7x 10

10-04-2024 02:58

240410-dgnb9sff7w 10

10-04-2024 02:58

240410-dgm2haff7v 10

23-08-2023 14:58

230823-sb7laaed41 10

Analysis

  • max time kernel
    597s
  • max time network
    597s
  • 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 02:58

General

  • Target

    loader.exe

  • Size

    401KB

  • MD5

    69e3cdc923b668aec4cb405c040565c6

  • SHA1

    6a675ebf6f241e543f7bb50ccc8ead462a427880

  • SHA256

    8d647fd3ebb00c9d853eb728ff7cba75b7a089d30f84090e3bc1dc460bdd47f3

  • SHA512

    5580919f6710fc210f079875eae22a87c85e854b57f59d10fc22680460f370154d7d223a66c9797387e4675a7954ba6f051a34571499481927980eb9ebf07cdb

  • SSDEEP

    6144:+CGmWI/2hvRn6Ie646G0D1eBlxy9bAmI6:+KWI/8B6Q9b5eBlxnmI6

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 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
  • 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\loader.exe
    "C:\Users\Admin\AppData\Local\Temp\loader.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2848
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "loader" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\loader.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2380
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2548
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:3212
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "loader" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\loader.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:1824
        • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
          "C:\Users\Admin\AppData\Local\TeamViewer\loader.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:4216
          • C:\Windows\System32\tar.exe
            "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp74E2.tmp" -C "C:\Users\Admin\AppData\Local\jjmzzxbvaf"
            4⤵
              PID:4836
            • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
              "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
              4⤵
              • Executes dropped EXE
              PID:400
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1184
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1340
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:72
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:2788
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:392
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:4428
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3688
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:5116
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:232
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:2216
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3636
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:2952
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1696
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1648
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3868
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1232
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4496
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1688
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3996
        • C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe
          "C:\Users\Admin\AppData\Local\jjmzzxbvaf\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\jjmzzxbvaf\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:4944

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        847B

        MD5

        486ebddc86ea8b3e965d390d22283a23

        SHA1

        eaffc047f067084867e8575c576a9ec60e094ba8

        SHA256

        50a57273ecb794e53b0622eb841341e2643c11f53fa47356e6e754ab2268171d

        SHA512

        0a50ba02250b38355a6f4fb94e40c61258a74031d9aea7cdf675f3e068f39ec0748ecf292aaf2f94b1963b9d66516ee79aa6c552617048e248774af0ff07189d

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

        Filesize

        401KB

        MD5

        69e3cdc923b668aec4cb405c040565c6

        SHA1

        6a675ebf6f241e543f7bb50ccc8ead462a427880

        SHA256

        8d647fd3ebb00c9d853eb728ff7cba75b7a089d30f84090e3bc1dc460bdd47f3

        SHA512

        5580919f6710fc210f079875eae22a87c85e854b57f59d10fc22680460f370154d7d223a66c9797387e4675a7954ba6f051a34571499481927980eb9ebf07cdb

      • C:\Users\Admin\AppData\Local\Temp\tmp74E2.tmp

        Filesize

        13.3MB

        MD5

        89d2d5811c1aff539bb355f15f3ddad0

        SHA1

        5bb3577c25b6d323d927200c48cd184a3e27c873

        SHA256

        b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12

        SHA512

        39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289

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

        Filesize

        2.7MB

        MD5

        a0db8a87f7b723266c8b04255da46b06

        SHA1

        4df00ea56d22d88f3d2e005ef66bad5b3ef92ebf

        SHA256

        60b43cdce0f807f7891521f396f53def34a7d98986dbde0faa2a197189c587f3

        SHA512

        41b8fc467d11af7ca6a42c7e94d1b8295ab3ae5d6d186b4f378e6e079440520e8324b695da1134beb2bc1697d2491edcc70c1b75ab6fc66b9c1cb2ecbcdb4a7d

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

        Filesize

        5.6MB

        MD5

        6f2b8aabd3f16370562a29120997d603

        SHA1

        deab07b573af0a5495b17749ce802a4c1de4aa5d

        SHA256

        c0180382ad3aa438ae4119030e5be5f4957e4bbee0849250f2cf9d1fabbb6765

        SHA512

        4b20269fd1d56d56a1efeac847ae1790b2d53fde48e13c26e2838fb9689e55a4ed760d86ac672b41954b239b1dd57956951a04a80e011ff50428544589c78cce

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

        Filesize

        64B

        MD5

        418b2cd3e40315baca43b90418c04160

        SHA1

        3a8d32b451ed2e27181674863fa343c9e4b87450

        SHA256

        9bb20e8650377dd9668bf935d3c4741fc4871637bdcc74c890912047bb3f1d8c

        SHA512

        78125acc8022f529939f2462e1570e1f219c654766ca47b16e0f0694b81c70713d9295ce407429c2bb0a16d327eb9d507587988c5aea0f0b45fe55f498bdbf47

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

        Filesize

        4B

        MD5

        fca0789e7891cbc0583298a238316122

        SHA1

        9e1f505e74ca9864c9132ba05e0670d85ff56fe5

        SHA256

        daab3aa68185b677bd3c8d63f12e48eacb0851d98d635137e531fd579a452486

        SHA512

        5bfd2472de37812bea557b2a10ade9f8e11981ff02d0257e8f5a48b624c332becd528d11c9ec20bea67342e6f9c977e500c2af77e98dd35e4cc7d52462b03a53

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

        Filesize

        7.4MB

        MD5

        88590909765350c0d70c6c34b1f31dd2

        SHA1

        129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

        SHA256

        46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

        SHA512

        a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

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

        Filesize

        218B

        MD5

        eb7ff4333aebea7ae5809989f099fadc

        SHA1

        5d7739b8ef004a208038102817ada13815725d93

        SHA256

        a2c8729c185f481c61cb83268e3785ae3e17376c7e4aeacfb8eee05cbd793efd

        SHA512

        1431073a3906b216313b5fa824558b5c949dde26c38560a746e717871057d659d7c8b8f9fe19557d2c475012b90ec259dab99ddfbea3efd9e325ec535d34146f

      • memory/72-88-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/72-85-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/72-86-0x000001A2C0D60000-0x000001A2C0D70000-memory.dmp

        Filesize

        64KB

      • memory/232-115-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/232-113-0x000002A5629A0000-0x000002A5629B0000-memory.dmp

        Filesize

        64KB

      • memory/232-112-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/392-101-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/392-98-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/392-99-0x000001C555980000-0x000001C555990000-memory.dmp

        Filesize

        64KB

      • memory/1184-61-0x00000222DC130000-0x00000222DC140000-memory.dmp

        Filesize

        64KB

      • memory/1184-60-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/1184-64-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/1696-137-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/1696-134-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/1696-135-0x000002807DB90000-0x000002807DBA0000-memory.dmp

        Filesize

        64KB

      • memory/2848-1-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/2848-0-0x0000021D58350000-0x0000021D583B8000-memory.dmp

        Filesize

        416KB

      • memory/2848-2-0x0000021D5A0D0000-0x0000021D5A0E0000-memory.dmp

        Filesize

        64KB

      • memory/2848-6-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/3636-126-0x0000017CCC2E0000-0x0000017CCC2F0000-memory.dmp

        Filesize

        64KB

      • memory/3636-128-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/3636-125-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/3688-110-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/3688-107-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/3688-108-0x000001E454720000-0x000001E454730000-memory.dmp

        Filesize

        64KB

      • memory/3868-146-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/3868-144-0x0000021B26670000-0x0000021B26680000-memory.dmp

        Filesize

        64KB

      • memory/3868-143-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/3996-167-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/3996-164-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/3996-165-0x000002A1C19F0000-0x000002A1C1A00000-memory.dmp

        Filesize

        64KB

      • memory/4216-57-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/4216-12-0x0000021770870000-0x0000021770880000-memory.dmp

        Filesize

        64KB

      • memory/4216-58-0x0000021770870000-0x0000021770880000-memory.dmp

        Filesize

        64KB

      • memory/4216-11-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/4496-152-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB

      • memory/4496-154-0x00007FF829470000-0x00007FF829F32000-memory.dmp

        Filesize

        10.8MB