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
    90s
  • max time network
    143s
  • platform
    windows7_x64
  • resource
    win7-20230831-en
  • resource tags

    arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
  • submitted
    14/10/2023, 04:25

General

  • Target
    Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe
  • Size 289KB
  • Sample231014-e12vfagc2y
  • 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 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 6 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 21 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:2112
    • 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:2752
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2664
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2904
        • 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:2888
        • 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:2540
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2540 -s 2572
            4⤵
              PID:1424
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {D64F65AA-9D37-4C92-92AE-01C9FDCF9953} S-1-5-21-686452656-3203474025-4140627569-1000:UUVOHKNL\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:2244
        • C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe
          C:\Users\Admin\AppData\Local\Nvidia\Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe
          2⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Suspicious use of AdjustPrivilegeToken
          • outlook_office_path
          • outlook_win_path
          PID:1616

      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 674b422a2b8ac43b29c550a7c9e43a0acb7e711fac38baf233c09ecee338a687
            • MD5 SHA1 SHA512

            94308059B57B3142E455B38A6EB92015

            • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
            • Size 344B
            • SHA256 614a8d068a3e63045a8794fddebee30deb67ec0c3b2f1e0590f4772027030222
            • MD5 SHA1 SHA512

            94308059B57B3142E455B38A6EB92015

            • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
            • Size 344B
            • SHA256 ad955ffab8eed59f5b71e28eef7a6458975573f6a47681e9575aefcb7272df62
            • MD5 SHA1 SHA512

            94308059B57B3142E455B38A6EB92015

            • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
            • Size 344B
            • SHA256 c5e891f1158739465517e118d99036b0ff4c21091e823311836ce5cf666f2072
            • MD5 SHA1 SHA512

            Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe

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

            Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe

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

            Xd2c386a3a6edfe99de10f6ce6b3659c4809a.exe

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

            CabB5CB.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\CabB5CB.tmp
            • Size 61KB
            • SHA256 6720349e7d82ee0a8e73920d3c2b7cb2912d9fcf2edb6fd98f2f12820158b0bf
            • MD5 SHA1 SHA512 SSDEEP

            TarB64B.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\TarB64B.tmp
            • Size 163KB
            • SHA256 bc3a6e84e41faeb57e7c21aa3b60c2a64777107009727c5b7c0ed8fe658909e5
            • MD5 SHA1 SHA512 SSDEEP

            port.dat

            • Path C:\Users\Admin\AppData\Local\xdh16uwiax\port.dat
            • Size 4B
            • SHA256 b903eceaae4690fafdc2fd76c23d1e44faf31bf0d1398078b967dcba01a11e6a
            • MD5 SHA1 SHA512

            memory/1616-163-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp

            memory/1616-164-0x000000001B0C0000-0x000000001B140000-memory.dmp

            memory/2112-0-0x0000000000AA0000-0x0000000000AEE000-memory.dmp

            memory/2112-5-0x000007FEF5DC0000-0x000007FEF67AC000-memory.dmp

            memory/2112-2-0x000000001B2D0000-0x000000001B350000-memory.dmp

            memory/2112-1-0x000007FEF5DC0000-0x000007FEF67AC000-memory.dmp

            memory/2540-11-0x000000001B0C0000-0x000000001B140000-memory.dmp

            memory/2540-9-0x0000000000B60000-0x0000000000BAE000-memory.dmp

            memory/2540-10-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp

            memory/2540-161-0x000007FEF53D0000-0x000007FEF5DBC000-memory.dmp