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
    600s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-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#.

  • Checks computer location settings 2 TTPs 11 IoCs

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

  • Executes dropped EXE 20 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 11 IoCs
  • Suspicious use of WriteProcessMemory 32 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⤵
    • Checks computer location settings
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1452
    • 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:2904
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:3744
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:3580
        • 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:5020
        • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
          "C:\Users\Admin\AppData\Local\TeamViewer\loader.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:4716
          • C:\Windows\System32\tar.exe
            "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp4F97.tmp" -C "C:\Users\Admin\AppData\Local\jjmzzxbvaf"
            4⤵
              PID:5032
            • 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:4144
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1224
        • 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:2200
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:620
        • 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:2376
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4632
        • 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:1632
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2112
        • 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:4892
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1460
        • 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:3296
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3844
        • 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:1036
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4720
        • 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:2044
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1912
        • 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:3412
      • C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        C:\Users\Admin\AppData\Local\TeamViewer\loader.exe
        1⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4212
        • 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:1764

      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

        3308a84a40841fab7dfec198b3c31af7

        SHA1

        4e7ab6336c0538be5dd7da529c0265b3b6523083

        SHA256

        169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e

        SHA512

        97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198

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

        Filesize

        401KB

        MD5

        69e3cdc923b668aec4cb405c040565c6

        SHA1

        6a675ebf6f241e543f7bb50ccc8ead462a427880

        SHA256

        8d647fd3ebb00c9d853eb728ff7cba75b7a089d30f84090e3bc1dc460bdd47f3

        SHA512

        5580919f6710fc210f079875eae22a87c85e854b57f59d10fc22680460f370154d7d223a66c9797387e4675a7954ba6f051a34571499481927980eb9ebf07cdb

      • C:\Users\Admin\AppData\Local\Temp\tmp4F97.tmp

        Filesize

        13.3MB

        MD5

        89d2d5811c1aff539bb355f15f3ddad0

        SHA1

        5bb3577c25b6d323d927200c48cd184a3e27c873

        SHA256

        b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12

        SHA512

        39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289

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

        Filesize

        18KB

        MD5

        09ebb18bf36c1e5829c306b606ba7bc4

        SHA1

        0d9c671e1325189ce47210e550666eb623a6d827

        SHA256

        f67f8fb9054579142c0791e87891e1f116c9f0699ab1ec57021edc0881e66452

        SHA512

        19b5163997f1b6382aaeca99d227da1c9b98487852cfb19ffa7965316d116e28dbc9144ffda10318bf979afaa2b0a860575e5952435b70dcbc18c37437eeb57f

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

        Filesize

        2.7MB

        MD5

        a0db8a87f7b723266c8b04255da46b06

        SHA1

        4df00ea56d22d88f3d2e005ef66bad5b3ef92ebf

        SHA256

        60b43cdce0f807f7891521f396f53def34a7d98986dbde0faa2a197189c587f3

        SHA512

        41b8fc467d11af7ca6a42c7e94d1b8295ab3ae5d6d186b4f378e6e079440520e8324b695da1134beb2bc1697d2491edcc70c1b75ab6fc66b9c1cb2ecbcdb4a7d

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

        Filesize

        13.4MB

        MD5

        39a4e206701cfedd2fbaeb9e2354c525

        SHA1

        405e62d90dd8af46594b312a96547421e3e3df41

        SHA256

        03e850710a972dbaea7bfca6d8df07793fa78bf91faef34f66c0c647be2a79d5

        SHA512

        abdcccd764f4169fd0f0928cee3495de8f6087e8ddd1d02340a317348366d49206c8cb8d7f5341731994afdb7985f4dc7ea4804920a6d6f5bd22dd75edc86314

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

        Filesize

        64B

        MD5

        162861cb48afed9bf9ec63a988b65fe2

        SHA1

        a68052c1ac5893397fd21f9e50bd81c9d3ec27b3

        SHA256

        743dea8a89c2fb9d792ad1fea5bc981786d725283016d52d79699d50108d9d47

        SHA512

        e2de1caf858e5affebbe6af047d38e217582eef2f83345f0f216421d2e3828015b3c002ffa060c9ea081c22f0ad30ae430065221de7d9c14b0cd0839fe6abcaa

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

        Filesize

        4B

        MD5

        56c51a39a7c77d8084838cc920585bd0

        SHA1

        a42e8d94ac4697062dec85ee6a8a7df9e37a5d55

        SHA256

        25616f4178f09f6e156042a6eb249280d54d5b1f5331209732b5a9b2a1fae5f7

        SHA512

        8b130743fb8ad31550413f320990a17a446b7b0ee2bee50159b057f9e0bc57fe397cc9ce161d872508f1e91c4dbafc0abfa2d6553bffca905d6ad074e3e800b2

      • 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

        b8238e4b4d2822358527c4af8166f810

        SHA1

        060bcc30ea86f477a4f62b0c2844c0c25d393c33

        SHA256

        fad98d105182a9e8df8bd38a03908b360f1e992c18b8b5c6f9bb75a56b341ef7

        SHA512

        bdf1a640bb4b4a89eff3c7455dfdd0499a8fc4ca905a293fe31b6948ea84fa500858dc01726c694cdc6e361be02616c91297f0c2c590bc71387d3c030ce23f79

      • memory/620-99-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/620-97-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/1224-79-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/1224-80-0x000001D5DBD80000-0x000001D5DBD90000-memory.dmp

        Filesize

        64KB

      • memory/1224-83-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/1452-1-0x00007FFC87130000-0x00007FFC87BF1000-memory.dmp

        Filesize

        10.8MB

      • memory/1452-0-0x000001A3E8880000-0x000001A3E88E8000-memory.dmp

        Filesize

        416KB

      • memory/1452-6-0x00007FFC87130000-0x00007FFC87BF1000-memory.dmp

        Filesize

        10.8MB

      • memory/1452-2-0x000001A3EAEF0000-0x000001A3EAF00000-memory.dmp

        Filesize

        64KB

      • memory/1460-124-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/1460-122-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/1912-150-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/1912-151-0x00000204D0930000-0x00000204D0940000-memory.dmp

        Filesize

        64KB

      • memory/1912-153-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/2112-106-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/2112-108-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/3844-132-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/3844-130-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/4212-163-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/4212-165-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/4632-104-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/4632-102-0x000001C8AC910000-0x000001C8AC920000-memory.dmp

        Filesize

        64KB

      • memory/4632-101-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/4716-12-0x000001EAA0320000-0x000001EAA0330000-memory.dmp

        Filesize

        64KB

      • memory/4716-69-0x000001EAA0320000-0x000001EAA0330000-memory.dmp

        Filesize

        64KB

      • memory/4716-65-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/4716-11-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/4720-138-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB

      • memory/4720-140-0x00007FFC87060000-0x00007FFC87B21000-memory.dmp

        Filesize

        10.8MB