Resubmissions

10/04/2024, 02:49

240410-da1n1sfe7v10

10/04/2024, 02:49

240410-daz3gscc3410

10/04/2024, 02:48

240410-dazfyscc3210

10/04/2024, 02:48

240410-dayvesfe7s10

14/10/2023, 03:45

231014-ea62gage6910

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
  • Sample240410-dazfyscc32
  • SHA256 44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31
  • MD5 SHA1 SHA512 SSDEEP

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

            Loading Replay Monitor...

            Downloads

            B9a5797cb584014f3fede.exe.log

            • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\B9a5797cb584014f3fede.exe.log
            • Size 847B
            • SHA256 50a57273ecb794e53b0622eb841341e2643c11f53fa47356e6e754ab2268171d
            • MD5 SHA1 SHA512

            B9a5797cb584014f3fede.exe

            • Path C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
            • Size 530KB
            • SHA256 44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31
            • MD5 SHA1 SHA512 SSDEEP

            tmp4B41.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\tmp4B41.tmp
            • Size 13.3MB
            • SHA256 b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12
            • MD5 SHA1 SHA512 SSDEEP

            cached-microdesc-consensus

            • Path C:\Users\Admin\AppData\Local\gzrj1xdnai\data\cached-microdesc-consensus
            • Size 2.6MB
            • SHA256 6b4f443629c32b632d8ad7bcb17d84da1e4eaec556dccdf98c5e9051cb404fed
            • MD5 SHA1 SHA512 SSDEEP

            cached-microdescs.new

            • Path C:\Users\Admin\AppData\Local\gzrj1xdnai\data\cached-microdescs.new
            • Size 7.8MB
            • SHA256 b39e48e5b159ca3f7dc5fb51583493ddc1260fd1df0f22ecc054a34cd6b6213c
            • MD5 SHA1 SHA512 SSDEEP

            hostname

            • Path C:\Users\Admin\AppData\Local\gzrj1xdnai\host\hostname
            • Size 64B
            • SHA256 01fe4993b4297f47a4d15e237c7d071b7adb0d3c971128a8e583547609981158
            • MD5 SHA1 SHA512

            port.dat

            • Path C:\Users\Admin\AppData\Local\gzrj1xdnai\port.dat
            • Size 4B
            • SHA256 dd5744ec739737eec7efcca1f0bf99bb5a1c894f565db45a64622ffb4f61f61a
            • MD5 SHA1 SHA512

            tor.exe

            • Path C:\Users\Admin\AppData\Local\gzrj1xdnai\tor\tor.exe
            • Size 7.4MB
            • SHA256 46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82
            • MD5 SHA1 SHA512 SSDEEP

            torrc.txt

            • Path C:\Users\Admin\AppData\Local\gzrj1xdnai\torrc.txt
            • Size 218B
            • SHA256 bc7832eb19dc2e369eef572ee21612deaedc8fc70f1716291fc50f827ddb94e9
            • MD5 SHA1 SHA512

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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