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
    1558s
  • max time network
    1558s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    10/04/2024, 02:41

General

  • Target
    x19a4f9f3d16fcc9779ba8ea79bf7.exe
  • Size 392KB
  • Sample240410-c6hmmsfd7z
  • 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#.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 2 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 6 IoCs
  • Looks up external IP address via web service 2 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.

  • Modifies system certificate store 2 TTPs 8 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 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:2320
    • 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⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2480
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2728
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2160
        • 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:2668
        • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
          "C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2696
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2696 -s 2628
            4⤵
              PID:1196
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {0A9798C1-13B7-4964-8FCF-E35CB88D0AD5} S-1-5-21-3452737119-3959686427-228443150-1000:QGTQZTRE\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:2612
        • C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
          C:\Users\Admin\AppData\Local\TeamViewer\x19a4f9f3d16fcc9779ba8ea79bf7.exe
          2⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          • outlook_office_path
          • outlook_win_path
          PID:688
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 688 -s 3300
            3⤵
              PID:2116

        Network

              MITRE ATT&CK Enterprise v15

              Replay Monitor

              Loading Replay Monitor...

              Downloads

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 344B
              • SHA256 dbd9b34e03637d46381e9a4e16b1750641b4c6d4085027cc2c926fcd5e7db4bc
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 344B
              • SHA256 71a592aded55b10d982f2f5e5fc7dcc2a7d43119806a24860c72eec1910c49f3
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 344B
              • SHA256 67914d2c1b260c2eab18879280513e9d0c56032ff29ba3f8abd4f7b66b05fb1f
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 344B
              • SHA256 607e9f9075e30d2adea6f05b0dcc7ef90fdf2b95041afad2211b7d43e527bb3d
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 344B
              • SHA256 7c81f050ddaf1d191cd8b362fde6e0ff25f7f881e96c2c95bbcdfccba012e69f
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 344B
              • SHA256 be1e4174322c3af1a21953a43e3dce8ea51b3c2b64761e2edbdf3a2f0f633888
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 344B
              • SHA256 1a9d04d6d2734f73958d29c06b9b1049b349fa901c8b5d332e6849b1fd0e90b9
              • MD5 SHA1 SHA512

              x19a4f9f3d16fcc9779ba8ea79bf7.exe

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

              Cab3D5F.tmp

              • Path C:\Users\Admin\AppData\Local\Temp\Cab3D5F.tmp
              • Size 65KB
              • SHA256 c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d
              • MD5 SHA1 SHA512 SSDEEP

              Cab3E45.tmp

              • Path C:\Users\Admin\AppData\Local\Temp\Cab3E45.tmp
              • Size 68KB
              • SHA256 1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184
              • MD5 SHA1 SHA512 SSDEEP

              Tar3D74.tmp

              • Path C:\Users\Admin\AppData\Local\Temp\Tar3D74.tmp
              • Size 171KB
              • SHA256 4276af3669a141a59388bc56a87f6614d9a9bdddf560636c264219a7eb11256f
              • MD5 SHA1 SHA512 SSDEEP

              Tar3E5A.tmp

              • Path C:\Users\Admin\AppData\Local\Temp\Tar3E5A.tmp
              • Size 177KB
              • SHA256 67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34
              • MD5 SHA1 SHA512 SSDEEP

              port.dat

              • Path C:\Users\Admin\AppData\Local\xtioxntk7k\port.dat
              • Size 4B
              • SHA256 0a1954a487177cc717104d967eb5962ee5c14970ef7f06a9e24b0363cdc6a334
              • MD5 SHA1 SHA512

              memory/688-517-0x000007FEF4830000-0x000007FEF521C000-memory.dmp

              memory/688-518-0x000000001B2F0000-0x000000001B370000-memory.dmp

              memory/688-450-0x000007FEF4830000-0x000007FEF521C000-memory.dmp

              memory/688-451-0x000000001B2F0000-0x000000001B370000-memory.dmp

              memory/2320-0-0x00000000000C0000-0x0000000000128000-memory.dmp

              memory/2320-5-0x000007FEF5220000-0x000007FEF5C0C000-memory.dmp

              memory/2320-2-0x0000000000480000-0x0000000000500000-memory.dmp

              memory/2320-1-0x000007FEF5220000-0x000007FEF5C0C000-memory.dmp

              memory/2696-11-0x00000000021A0000-0x0000000002220000-memory.dmp

              memory/2696-448-0x00000000021A0000-0x0000000002220000-memory.dmp

              memory/2696-447-0x000007FEF4830000-0x000007FEF521C000-memory.dmp

              memory/2696-9-0x00000000000A0000-0x0000000000108000-memory.dmp

              memory/2696-10-0x000007FEF4830000-0x000007FEF521C000-memory.dmp