Resubmissions

10/04/2024, 02:52

240410-dcqxlaff2v10

10/04/2024, 02:52

240410-dcqltscc7210

10/04/2024, 02:51

240410-dcm6pscc6710

10/04/2024, 02:51

240410-dcmj6scc6610

14/10/2023, 04:10

231014-erhp7sga6y10

Analysis

  • max time kernel
    359s
  • max time network
    565s
  • platform
    windows7_x64
  • resource
    win7-20231129-en
  • resource tags

    arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
  • submitted
    10/04/2024, 02:51

General

  • Target
    f21559ac7c67d871d4f05.exe
  • Size 327KB
  • Sample240410-dcm6pscc67
  • SHA256 dba8f020ac6d09728422932492657fea3f0a95754cd279f5a949b6982bd32129
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • gurcu

C2
  • https://api.telegram.org/bot5968091729:AAHVag_ncx5c5AIYERGTqv9kr7clJT1_HDU/sendMessage?chat_id=-1001962300376

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 10 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\f21559ac7c67d871d4f05.exe
    "C:\Users\Admin\AppData\Local\Temp\f21559ac7c67d871d4f05.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2392
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "f21559ac7c67d871d4f05" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\f21559ac7c67d871d4f05.exe" &&START "" "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:3060
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2540
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2932
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "f21559ac7c67d871d4f05" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2584
        • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
          "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2644
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2644 -s 2412
            4⤵
              PID:2692
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {F6C5B17C-521C-4033-B333-6F62E02C7A36} S-1-5-21-3627615824-4061627003-3019543961-1000:SCFGBRBT\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:2544
        • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
          C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
          2⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          • outlook_office_path
          • outlook_win_path
          PID:1636
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 1636 -s 1796
            3⤵
              PID:1328

        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

              F0ACCF77CDCBFF39F6191887F6D2D357

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\F0ACCF77CDCBFF39F6191887F6D2D357
              • Size 1KB
              • SHA256 df545bf919a2439c36983b54cdfc903dfa4f37d3996d8d84b4c31eec6f3c163e
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 344B
              • SHA256 0fb4d8deac188230953c17f9b455ee0cb554206056453084c8cbd9b417a1f43f
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 344B
              • SHA256 ae8068e1e70ee61bb44c2d8ff3839af1536ce23a23c440994bc21050b5f92f70
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 344B
              • SHA256 330493c48f315eb95ccd2b6068f2cd83e6a0df8febf9f1867e6cc5ab8b13f1f4
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 344B
              • SHA256 de10fbe2a08eab378077ff08f016964b53773e598a8ee1ac1fa4e931ccf46b10
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 344B
              • SHA256 914d0f04375718fe3133b1a1bde4e5e83010b6a447be19f027ee1ce2c390a19a
              • MD5 SHA1 SHA512

              94308059B57B3142E455B38A6EB92015

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
              • Size 344B
              • SHA256 5eec6fc9f46639cb77093752b71b4ffca23bd0e444c964c2563f3aa7a2e1ae69
              • MD5 SHA1 SHA512

              F0ACCF77CDCBFF39F6191887F6D2D357

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\F0ACCF77CDCBFF39F6191887F6D2D357
              • Size 242B
              • SHA256 c217342dbbd9d51ca3bbe2b5633a45c9fed77e1868db5e66e0548eee2c046789
              • MD5 SHA1 SHA512

              f21559ac7c67d871d4f05.exe

              • Path C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
              • Size 327KB
              • SHA256 dba8f020ac6d09728422932492657fea3f0a95754cd279f5a949b6982bd32129
              • MD5 SHA1 SHA512 SSDEEP

              Tar2082.tmp

              • Path C:\Users\Admin\AppData\Local\Temp\Tar2082.tmp
              • Size 177KB
              • SHA256 67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34
              • MD5 SHA1 SHA512 SSDEEP

              port.dat

              • Path C:\Users\Admin\AppData\Local\z1jp774dks\port.dat
              • Size 4B
              • SHA256 04e97796ac4d1ffe851398d3a25afad5f62916ef5ac22f6f10e83192dc15e8c3
              • MD5 SHA1 SHA512

              memory/1636-303-0x000007FEF5270000-0x000007FEF5C5C000-memory.dmp

              memory/1636-280-0x000007FEF5270000-0x000007FEF5C5C000-memory.dmp

              memory/2392-1-0x000007FEF5C60000-0x000007FEF664C000-memory.dmp

              memory/2392-5-0x000007FEF5C60000-0x000007FEF664C000-memory.dmp

              memory/2392-2-0x000000001B490000-0x000000001B510000-memory.dmp

              memory/2392-0-0x0000000000AC0000-0x0000000000B18000-memory.dmp

              memory/2644-11-0x000000001B120000-0x000000001B1A0000-memory.dmp

              memory/2644-277-0x000007FEF5270000-0x000007FEF5C5C000-memory.dmp

              memory/2644-278-0x000000001B120000-0x000000001B1A0000-memory.dmp

              memory/2644-9-0x0000000000080000-0x00000000000D8000-memory.dmp

              memory/2644-10-0x000007FEF5270000-0x000007FEF5C5C000-memory.dmp