Resubmissions

10/04/2024, 02:41

240410-c6hmmsfd7z10

10/04/2024, 02:41

240410-c6g14scb4610

10/04/2024, 02:41

240410-c6gqcacb4510

10/04/2024, 02:41

240410-c6f4tacb4410

14/10/2023, 01:33

231014-bysbfahh6s10

Analysis

  • max time kernel
    300s
  • max time network
    305s
  • 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, 02:41

General

  • Target
    x19a4f9f3d16fcc9779ba8ea79bf7.exe
  • Size 392KB
  • Sample240410-c6f4tacb44
  • SHA256 c3439dd56bcf3921cdbfcbdff3f928d14ebd632b3411235657bf9f5452c1ab9d
  • MD5 SHA1 SHA512 SSDEEP

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 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
  • 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\x19a4f9f3d16fcc9779ba8ea79bf7.exe
    "C:\Users\Admin\AppData\Local\Temp\x19a4f9f3d16fcc9779ba8ea79bf7.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1052
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "x19a4f9f3d16fcc9779ba8ea79bf7" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\x19a4f9f3d16fcc9779ba8ea79bf7.exe" &&START "" "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:872
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:4916
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2284
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "x19a4f9f3d16fcc9779ba8ea79bf7" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:1020
        • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
          "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.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:4160
          • C:\Windows\System32\tar.exe
            "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp81C3.tmp" -C "C:\Users\Admin\AppData\Local\xtioxntk7k"
            4⤵
              PID:4704
            • C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe
              "C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\xtioxntk7k\torrc.txt"
              4⤵
              • Executes dropped EXE
              PID:4808
      • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4980
        • C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe
          "C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\xtioxntk7k\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:5048
      • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3364
        • C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe
          "C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\xtioxntk7k\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:432
      • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4988
        • C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe
          "C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\xtioxntk7k\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:1832
      • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:424
        • C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe
          "C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\xtioxntk7k\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:2396
      • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:3756
        • C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe
          "C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\xtioxntk7k\torrc.txt"
          2⤵
          • Executes dropped EXE
          PID:432

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            x19a4f9f3d16fcc9779ba8ea79bf7.exe.log

            • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\x19a4f9f3d16fcc9779ba8ea79bf7.exe.log
            • Size 847B
            • SHA256 50a57273ecb794e53b0622eb841341e2643c11f53fa47356e6e754ab2268171d
            • MD5 SHA1 SHA512

            x19a4f9f3d16fcc9779ba8ea79bf7.exe

            • Path C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
            • Size 392KB
            • SHA256 c3439dd56bcf3921cdbfcbdff3f928d14ebd632b3411235657bf9f5452c1ab9d
            • MD5 SHA1 SHA512 SSDEEP

            tmp81C3.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\tmp81C3.tmp
            • Size 13.3MB
            • SHA256 b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12
            • MD5 SHA1 SHA512 SSDEEP

            cached-microdesc-consensus

            • Path C:\Users\Admin\AppData\Local\xtioxntk7k\data\cached-microdesc-consensus
            • Size 2.7MB
            • SHA256 60b43cdce0f807f7891521f396f53def34a7d98986dbde0faa2a197189c587f3
            • MD5 SHA1 SHA512 SSDEEP

            cached-microdescs.new

            • Path C:\Users\Admin\AppData\Local\xtioxntk7k\data\cached-microdescs.new
            • Size 8.4MB
            • SHA256 b8c75ca17a79f3c95bd9aa1c7dd637647c67b78fa5e4f2d651121f84f3dfc835
            • MD5 SHA1 SHA512 SSDEEP

            hostname

            • Path C:\Users\Admin\AppData\Local\xtioxntk7k\host\hostname
            • Size 64B
            • SHA256 ade34f1def90b849b72827918510d551089bc351852cc44bbc2b99fb9943de75
            • MD5 SHA1 SHA512

            port.dat

            • Path C:\Users\Admin\AppData\Local\xtioxntk7k\port.dat
            • Size 4B
            • SHA256 b8e5918871d490fedab8e3b8de116e80b2cdd5c5b3027d927853cea5b279d19d
            • MD5 SHA1 SHA512

            tor.exe

            • Path C:\Users\Admin\AppData\Local\xtioxntk7k\tor\tor.exe
            • Size 7.4MB
            • SHA256 46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82
            • MD5 SHA1 SHA512 SSDEEP

            torrc.txt

            • Path C:\Users\Admin\AppData\Local\xtioxntk7k\torrc.txt
            • Size 218B
            • SHA256 a9ec09359c190fc186eecff5ec3a8f796ac5e6d9d196c867c0fa4941de24a8e4
            • MD5 SHA1 SHA512

            memory/424-111-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

            memory/424-109-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

            memory/1052-0-0x0000015CA5AA0000-0x0000015CA5B08000-memory.dmp

            memory/1052-6-0x00007FF9929D0000-0x00007FF993492000-memory.dmp

            memory/1052-2-0x0000015CC02E0000-0x0000015CC02F0000-memory.dmp

            memory/1052-1-0x00007FF9929D0000-0x00007FF993492000-memory.dmp

            memory/3364-93-0x000001BBA49D0000-0x000001BBA49E0000-memory.dmp

            memory/3364-95-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

            memory/3364-92-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

            memory/3756-123-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

            memory/3756-121-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

            memory/4160-12-0x000001FA1FEC0000-0x000001FA1FED0000-memory.dmp

            memory/4160-76-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

            memory/4160-11-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

            memory/4980-86-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

            memory/4980-84-0x00000168A7320000-0x00000168A7330000-memory.dmp

            memory/4980-82-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

            memory/4988-105-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp

            memory/4988-107-0x00007FF991CF0000-0x00007FF9927B2000-memory.dmp