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
    357s
  • max time network
    518s
  • platform
    windows7_x64
  • resource
    win7-20240215-en
  • resource tags

    arch:x64arch:x86image:win7-20240215-enlocale:en-usos:windows7-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#.

  • 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 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.

  • 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\B9a5797cb584014f3fede.exe
    "C:\Users\Admin\AppData\Local\Temp\B9a5797cb584014f3fede.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2204
    • 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⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2052
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2124
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2596
        • 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:2608
        • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
          "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2556
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2556 -s 2376
            4⤵
              PID:2596
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {E9073ACC-163E-4C5E-9FD1-7FF548CB4C3A} S-1-5-21-2248906074-2862704502-246302768-1000:GHPZRGFC\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:2756
        • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
          C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
          2⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          • outlook_office_path
          • outlook_win_path
          PID:2808
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2808 -s 1916
            3⤵
              PID:2536

        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 3fea551a5546a8385c8c3db021cf466cf490789d8290bd362b371ca002ca1cae
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 344B
              • SHA256 9593252b92b04e4b98adfe75df0e67d0e4e98568b8de1d3bdfa4a684742207f2
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 344B
              • SHA256 e14866264753026a0678b334ce6b9b333b50dac6c02534634c6d379c361a857a
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 344B
              • SHA256 1e99680863e774871269625c233714fa7e1e1ac71bd7907db3faa39fe78c9362
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 344B
              • SHA256 929b0b733bd759758713484f0ce58f74f02b4084412eaca73c4f8059cefe6e37
              • MD5 SHA1 SHA512

              B9a5797cb584014f3fede.exe

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

              Cab28D8.tmp

              • Path C:\Users\Admin\AppData\Local\Temp\Cab28D8.tmp
              • Size 65KB
              • SHA256 c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d
              • MD5 SHA1 SHA512 SSDEEP

              Cab2909.tmp

              • Path C:\Users\Admin\AppData\Local\Temp\Cab2909.tmp
              • Size 68KB
              • SHA256 1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184
              • MD5 SHA1 SHA512 SSDEEP

              Tar296B.tmp

              • Path C:\Users\Admin\AppData\Local\Temp\Tar296B.tmp
              • Size 177KB
              • SHA256 67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34
              • MD5 SHA1 SHA512 SSDEEP

              port.dat

              • Path C:\Users\Admin\AppData\Local\gzrj1xdnai\port.dat
              • Size 4B
              • SHA256 f2c8a205eccaca21250b2ab19655462e91b28f93a94118821e8e1ec4124abf4b
              • MD5 SHA1 SHA512

              memory/2204-5-0x000007FEF56B0000-0x000007FEF609C000-memory.dmp

              memory/2204-0-0x00000000012B0000-0x000000000133A000-memory.dmp

              memory/2204-2-0x000000001B060000-0x000000001B0E0000-memory.dmp

              memory/2204-1-0x000007FEF56B0000-0x000007FEF609C000-memory.dmp

              memory/2556-10-0x000007FEF4CC0000-0x000007FEF56AC000-memory.dmp

              memory/2556-11-0x0000000000B40000-0x0000000000BC0000-memory.dmp

              memory/2556-9-0x00000000013E0000-0x000000000146A000-memory.dmp

              memory/2556-346-0x000007FEF4CC0000-0x000007FEF56AC000-memory.dmp

              memory/2808-248-0x000007FEF4CC0000-0x000007FEF56AC000-memory.dmp

              memory/2808-347-0x000007FEF4CC0000-0x000007FEF56AC000-memory.dmp

              memory/2808-348-0x000000001AD00000-0x000000001AD80000-memory.dmp