Analysis

  • max time kernel
    150s
  • max time network
    142s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    14/02/2023, 09:28

General

  • Target
    38e83729cbc213f277eea5f8e529ffb9.exe
  • Size 179KB
  • Sample230214-lfcs5sbf6v
  • SHA256 62b09d92565241be83096a78a7dcd5a550c25788e711cef9d52bf95e9bfeb60c
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Detects Smokeloader packer 1 IoCs
  • SmokeLoader

    Modular backdoor trojan in use since 2014.

  • Blocklisted process makes network request 2 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Program crash 1 IoCs
  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Checks processor information in registry 2 TTPs 26 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Modifies Internet Explorer settings 1 TTPs 4 IoCs
  • Modifies registry class 30 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 20 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\38e83729cbc213f277eea5f8e529ffb9.exe
    "C:\Users\Admin\AppData\Local\Temp\38e83729cbc213f277eea5f8e529ffb9.exe"
    1⤵
    • Checks SCSI registry key(s)
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: MapViewOfSection
    PID:1048
  • C:\Users\Admin\AppData\Local\Temp\D631.exe
    C:\Users\Admin\AppData\Local\Temp\D631.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:5020
    • C:\Windows\SysWOW64\rundll32.exe
      C:\Windows\system32\rundll32.exe C:\Users\Admin\AppData\Local\Temp\Ruifriwreh.dll,start
      2⤵
      • Blocklisted process makes network request
      • Loads dropped DLL
      • Suspicious use of SetThreadContext
      • Checks processor information in registry
      • Suspicious use of WriteProcessMemory
      PID:1808
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" "C:\Windows\system32\shell32.dll",#61 14184
        3⤵
        • Modifies registry class
        • Suspicious use of FindShellTrayWindow
        PID:2940
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 5020 -s 480
      2⤵
      • Program crash
      PID:1684
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 5020 -ip 5020
    1⤵
      PID:456
    • C:\Windows\System32\rundll32.exe
      C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
      1⤵
        PID:5112

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            D631.exe

            • Path C:\Users\Admin\AppData\Local\Temp\D631.exe
            • Size 3.6MB
            • SHA256 b012b27859a78eccfa55b9d5f4597c454807d0cba2035f0428d9cd4fa8ecca83
            • MD5 SHA1 SHA512 SSDEEP

            D631.exe

            • Path C:\Users\Admin\AppData\Local\Temp\D631.exe
            • Size 3.6MB
            • SHA256 b012b27859a78eccfa55b9d5f4597c454807d0cba2035f0428d9cd4fa8ecca83
            • MD5 SHA1 SHA512 SSDEEP

            Ruifriwreh.dll

            • Path C:\Users\Admin\AppData\Local\Temp\Ruifriwreh.dll
            • Size 4.3MB
            • SHA256 544c669128a95cd281ea368c54cf7370817f18031aad81f63bb4fd7859b8d14d
            • MD5 SHA1 SHA512 SSDEEP

            Ruifriwreh.dll

            • Path C:\Users\Admin\AppData\Local\Temp\Ruifriwreh.dll
            • Size 4.3MB
            • SHA256 544c669128a95cd281ea368c54cf7370817f18031aad81f63bb4fd7859b8d14d
            • MD5 SHA1 SHA512 SSDEEP

            Ruifriwreh.dll

            • Path C:\Users\Admin\AppData\Local\Temp\Ruifriwreh.dll
            • Size 4.3MB
            • SHA256 544c669128a95cd281ea368c54cf7370817f18031aad81f63bb4fd7859b8d14d
            • MD5 SHA1 SHA512 SSDEEP

            memory/1048-135-0x0000000000400000-0x0000000000788000-memory.dmp

            memory/1048-133-0x0000000000A20000-0x0000000000A29000-memory.dmp

            memory/1048-132-0x0000000000B0E000-0x0000000000B23000-memory.dmp

            memory/1048-134-0x0000000000400000-0x0000000000788000-memory.dmp

            memory/1808-147-0x00000000025D0000-0x0000000002A25000-memory.dmp

            memory/1808-154-0x0000000004610000-0x0000000004750000-memory.dmp

            memory/1808-156-0x0000000004610000-0x0000000004750000-memory.dmp

            memory/1808-155-0x0000000004610000-0x0000000004750000-memory.dmp

            memory/1808-160-0x0000000004689000-0x000000000468B000-memory.dmp

            memory/1808-150-0x0000000003A00000-0x000000000454D000-memory.dmp

            memory/1808-153-0x0000000004610000-0x0000000004750000-memory.dmp

            memory/1808-149-0x0000000003A00000-0x000000000454D000-memory.dmp

            memory/1808-163-0x0000000003A00000-0x000000000454D000-memory.dmp

            memory/1808-151-0x0000000004610000-0x0000000004750000-memory.dmp

            memory/1808-152-0x0000000004610000-0x0000000004750000-memory.dmp

            memory/2940-162-0x000001B94D410000-0x000001B94D6B9000-memory.dmp

            memory/2940-158-0x000001B94D290000-0x000001B94D3D0000-memory.dmp

            memory/2940-159-0x000001B94D290000-0x000001B94D3D0000-memory.dmp

            memory/2940-161-0x0000000000FF0000-0x0000000001287000-memory.dmp

            memory/5020-139-0x00000000027E7000-0x0000000002B6F000-memory.dmp

            memory/5020-148-0x0000000000400000-0x0000000000AFE000-memory.dmp

            memory/5020-142-0x0000000000400000-0x0000000000AFE000-memory.dmp

            memory/5020-141-0x0000000000400000-0x0000000000AFE000-memory.dmp

            memory/5020-140-0x0000000002B70000-0x000000000305A000-memory.dmp