Resubmissions

10/04/2024, 02:25

240410-cwlljsbh9910

10/04/2024, 02:25

240410-cwlasafc5v10

10/04/2024, 02:25

240410-cwkn9afc5t10

10/04/2024, 02:25

240410-cwkdgsfc5s10

14/10/2023, 04:25

231014-e12vfagc2y10

Analysis

  • max time kernel
    1556s
  • max time network
    1557s
  • platform
    windows7_x64
  • resource
    win7-20240215-en
  • resource tags

    arch:x64arch:x86image:win7-20240215-enlocale:en-usos:windows7-x64system
  • submitted
    10/04/2024, 02:25

General

  • Target
    Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe
  • Size 289KB
  • Sample240410-cwlljsbh99
  • SHA256 41505242cdbf259aada52b773daeec33d239e4aefd685ba9e406d2cf2f9871a4
  • 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 13 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\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe
    "C:\Users\Admin\AppData\Local\Temp\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1512
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "Xd2c386a3a6edfe99de10f6ce6b3659c4809a" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe" &&START "" "C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2016
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:1796
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2032
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "Xd2c386a3a6edfe99de10f6ce6b3659c4809a" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2596
        • C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe
          "C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2652
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2652 -s 2588
            4⤵
              PID:1664
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {85C0E9D4-8197-4625-814B-8F610AB790DF} S-1-5-21-2248906074-2862704502-246302768-1000:GHPZRGFC\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:2380
        • C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe
          C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.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:2320
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2320 -s 2232
            3⤵
              PID:2152

        Network

              MITRE ATT&CK Enterprise v15

              Replay Monitor

              Loading Replay Monitor...

              Downloads

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015
              • Size 68KB
              • SHA256 1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184
              • MD5 SHA1 SHA512 SSDEEP

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 304B
              • SHA256 c6af10dee1a0c455b5eac5ed24576ebb2eda5a0f8da1ef60ce9abace97de6430
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 304B
              • SHA256 5a9a00296118add6797153487caedbc1a235ac777c853bb91b16be171d0f810c
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 304B
              • SHA256 562eb4444873dfbf3f1ebe80e2a4651d194b9abd309e83f064e72f1faab17098
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 304B
              • SHA256 fec8065e38b4cc25ad7980d6782c59ee3a5b9285656379dcd2790da9f6bf78d1
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 304B
              • SHA256 d1b58b4723cea8e7359c216b8b309c0b1cc45f2fa3d0b544d9c490d3d33891e0
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 304B
              • SHA256 8f297c3ca9eefa6b011f78d47b80e4e9ced5b7170426c9cf2901354b6bbe090a
              • MD5 SHA1 SHA512

              Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe

              • Path C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe
              • Size 289KB
              • SHA256 41505242cdbf259aada52b773daeec33d239e4aefd685ba9e406d2cf2f9871a4
              • MD5 SHA1 SHA512 SSDEEP

              Tar2D8E.tmp

              • Path C:\Users\Admin\AppData\Local\Temp\Tar2D8E.tmp
              • Size 177KB
              • SHA256 67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34
              • MD5 SHA1 SHA512 SSDEEP

              port.dat

              • Path C:\Users\Admin\AppData\Local\xdh16uwiax\port.dat
              • Size 4B
              • SHA256 37353e9f8e1ec72d923c72b6b0f42f7403bd9bbb222035a87d6d40b8d9f4007b
              • MD5 SHA1 SHA512

              memory/1512-1-0x000007FEF5B70000-0x000007FEF655C000-memory.dmp

              memory/1512-0-0x0000000000D00000-0x0000000000D4E000-memory.dmp

              memory/1512-5-0x000007FEF5B70000-0x000007FEF655C000-memory.dmp

              memory/1512-2-0x000000001ACC0000-0x000000001AD40000-memory.dmp

              memory/2320-291-0x000000001AFF0000-0x000000001B070000-memory.dmp

              memory/2320-290-0x000007FEF5180000-0x000007FEF5B6C000-memory.dmp

              memory/2320-143-0x000007FEF5180000-0x000007FEF5B6C000-memory.dmp

              memory/2320-144-0x000000001AFF0000-0x000000001B070000-memory.dmp

              memory/2652-9-0x0000000001150000-0x000000000119E000-memory.dmp

              memory/2652-287-0x000007FEF5180000-0x000007FEF5B6C000-memory.dmp

              memory/2652-289-0x000000001B070000-0x000000001B0F0000-memory.dmp

              memory/2652-10-0x000007FEF5180000-0x000007FEF5B6C000-memory.dmp

              memory/2652-11-0x000000001B070000-0x000000001B0F0000-memory.dmp