Analysis

  • max time kernel
    134s
  • max time network
    128s
  • platform
    windows7_x64
  • resource
    win7-20240220-en
  • resource tags

    arch:x64arch:x86image:win7-20240220-enlocale:en-usos:windows7-x64system
  • submitted
    14/06/2024, 14:21

General

  • Target
    Windows优化卫士 6.0/YiXinSafe/mb.dll
  • Size 8.2MB
  • Sample240614-rpcgmathka
  • SHA256 1f48007c2b9c6fe919579c3375d2505727f5fcf1b5059cb769cb81bfc9be4ce4
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Ramnit

    Ramnit is a versatile family that holds viruses, worms, and Trojans.

  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 2 IoCs
  • UPX packed file 3 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Drops file in System32 directory 1 IoCs
  • Drops file in Program Files directory 3 IoCs
  • Modifies Internet Explorer settings 1 TTPs 28 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Windows\system32\rundll32.exe
    rundll32.exe "C:\Users\Admin\AppData\Local\Temp\Windows优化卫士 6.0\YiXinSafe\mb.dll",#1
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2912
    • C:\Windows\SysWOW64\rundll32.exe
      rundll32.exe "C:\Users\Admin\AppData\Local\Temp\Windows优化卫士 6.0\YiXinSafe\mb.dll",#1
      2⤵
      • Loads dropped DLL
      • Drops file in System32 directory
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2704
      • C:\Windows\SysWOW64\rundll32Srv.exe
        C:\Windows\SysWOW64\rundll32Srv.exe
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Drops file in Program Files directory
        • Suspicious use of WriteProcessMemory
        PID:2980
        • C:\Program Files (x86)\Microsoft\DesktopLayer.exe
          "C:\Program Files (x86)\Microsoft\DesktopLayer.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:2520
          • C:\Program Files\Internet Explorer\iexplore.exe
            "C:\Program Files\Internet Explorer\iexplore.exe"
            5⤵
            • Modifies Internet Explorer settings
            • Suspicious use of FindShellTrayWindow
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:2480
            • C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE
              "C:\Program Files (x86)\Internet Explorer\IEXPLORE.EXE" SCODEF:2480 CREDAT:275457 /prefetch:2
              6⤵
              • Modifies Internet Explorer settings
              • Suspicious use of SetWindowsHookEx
              PID:2652

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015
        • Size 70KB
        • SHA256 b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f
        • MD5 SHA1 SHA512 SSDEEP

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 fc48676977770514ab76528d70f2368263ee54ec35b46cf5ddffb01d10e60410
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 2cb275b17b766da0edb705d9dcfe2ff6780401980ec7efcd9d38d0585aa7cdb1
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 21084b2a4a63a9a638d9cffaced6b1d076efd7c13407e49dceb75c70b903239f
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 68d9bac3f6e830243d5c309896dd5a8744427c8f6aaeca77676083ab959b2527
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 aa6169040540b6557c83ed286c87e5e9ffd91e3c28a27e80924f649c1e6f67a8
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 c1b02a2c356c8799f050c964e18660287d729819495531549d3da305ec7cd306
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 d11138dfa8528ca047b0b7e6178e28e0cb5ea703c8f5c01625d2eb73ce345f22
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 7263a748bc3ff89e0cdb4b3895a0bc540a9961049bcc06f95da0f7081e03a131
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 58b94ab476cf3b665688da0c4940feb0507ca824f3d1bc3af783ee4f0985b508
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 79ee1e5078ecc4cdbd7845f2de201b76ade02c82f70cc9fa69bb971c5a7d8212
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 7771392d84279f203d6798afe347bd5f293762555edb80ed04e22b2a72defac0
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 686fa8cb1d793120c9ceaf3a91b7f22a2639a0f0b93698d05033c6bbcd896b98
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 41fa4a0ccc9bed1d7c071d063d693a8d1c8d6b452d9a70ae0442d0e9e3e6d63b
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 8184d89856f74b09dab59c68216b8a2334eabc4427a205fe6d1f29b43ac8e94d
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 f144b4a64b581c4ed7233d4f590582baa2b41b7fc0a4126e30fb3bc3fdd1efbb
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 0c4d25b82c53201870abc3cbb63cdf83c18bb1d49af2a72f953618385496dd70
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 ab4ec1b413b0865ddffad80817ac18b95abff2a200ad21ac14d24c31c01587ff
        • MD5 SHA1 SHA512

        94308059B57B3142E455B38A6EB92015

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
        • Size 342B
        • SHA256 e82562e3da0c48b97de0560fe5288d5be558b71c554495ced2c8ed9d7857edae
        • MD5 SHA1 SHA512

        Cab29A3.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\Cab29A3.tmp
        • Size 65KB
        • SHA256 c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d
        • MD5 SHA1 SHA512 SSDEEP

        Tar2A74.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\Tar2A74.tmp
        • Size 181KB
        • SHA256 8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8
        • MD5 SHA1 SHA512 SSDEEP

        rundll32Srv.exe

        • Path \Windows\SysWOW64\rundll32Srv.exe
        • Size 55KB
        • SHA256 fd6c69c345f1e32924f0a5bb7393e191b393a78d58e2c6413b03ced7482f2320
        • MD5 SHA1 SHA512 SSDEEP

        memory/2520-15-0x0000000000240000-0x0000000000241000-memory.dmp

        memory/2520-17-0x0000000000400000-0x000000000042E000-memory.dmp

        memory/2704-13-0x0000000010000000-0x0000000010897000-memory.dmp

        memory/2704-18-0x0000000010000000-0x0000000010897000-memory.dmp

        memory/2704-19-0x0000000010000000-0x0000000010897000-memory.dmp

        memory/2980-12-0x0000000000400000-0x000000000042E000-memory.dmp