Analysis

  • max time kernel
    150s
  • max time network
    123s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24/01/2023, 02:19

General

  • Target
    file.exe
  • Size 335KB
  • Sample230124-crvcwsaa3v
  • SHA256 69a2a12a33442670cfa7d053a80a4168bc0694a5aa1383d3cfada55d9f8114ed
  • 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 2 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 6 IoCs

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

  • Checks processor information in registry 2 TTPs 20 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 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 18 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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks SCSI registry key(s)
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: MapViewOfSection
    PID:2620
  • C:\Users\Admin\AppData\Local\Temp\DEBC.exe
    C:\Users\Admin\AppData\Local\Temp\DEBC.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:3276
    • C:\Windows\SysWOW64\rundll32.exe
      C:\Windows\system32\rundll32.exe C:\Users\Admin\AppData\Local\Temp\Atfaeoyeipquf.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:4100
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" "C:\Windows\system32\shell32.dll",#61 22731
        3⤵
        • Modifies registry class
        • Suspicious use of FindShellTrayWindow
        PID:3184
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3276 -s 512
      2⤵
      • Program crash
      PID:60
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 3276 -ip 3276
    1⤵
      PID:696
    • C:\Users\Admin\AppData\Roaming\usiugjc
      C:\Users\Admin\AppData\Roaming\usiugjc
      1⤵
      • Executes dropped EXE
      • Checks SCSI registry key(s)
      • Suspicious behavior: MapViewOfSection
      PID:3540
    • C:\Windows\System32\rundll32.exe
      C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
      1⤵
        PID:3948

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            Atfaeoyeipquf.dll

            • Path C:\Users\Admin\AppData\Local\Temp\Atfaeoyeipquf.dll
            • Size 4.3MB
            • SHA256 e5ce5f3e5f330a184183bcc853130eca7da07113b1f3b64ca463f8a90fe65265
            • MD5 SHA1 SHA512 SSDEEP

            Atfaeoyeipquf.dll

            • Path C:\Users\Admin\AppData\Local\Temp\Atfaeoyeipquf.dll
            • Size 4.3MB
            • SHA256 e5ce5f3e5f330a184183bcc853130eca7da07113b1f3b64ca463f8a90fe65265
            • MD5 SHA1 SHA512 SSDEEP

            Atfaeoyeipquf.dll

            • Path C:\Users\Admin\AppData\Local\Temp\Atfaeoyeipquf.dll
            • Size 4.3MB
            • SHA256 e5ce5f3e5f330a184183bcc853130eca7da07113b1f3b64ca463f8a90fe65265
            • MD5 SHA1 SHA512 SSDEEP

            DEBC.exe

            • Path C:\Users\Admin\AppData\Local\Temp\DEBC.exe
            • Size 3.8MB
            • SHA256 e36985dd9c5f69c48df8e0bddb8f66284462a3e08d5ea4da4af3892286e4027d
            • MD5 SHA1 SHA512 SSDEEP

            DEBC.exe

            • Path C:\Users\Admin\AppData\Local\Temp\DEBC.exe
            • Size 3.8MB
            • SHA256 e36985dd9c5f69c48df8e0bddb8f66284462a3e08d5ea4da4af3892286e4027d
            • MD5 SHA1 SHA512 SSDEEP

            usiugjc

            • Path C:\Users\Admin\AppData\Roaming\usiugjc
            • Size 335KB
            • SHA256 69a2a12a33442670cfa7d053a80a4168bc0694a5aa1383d3cfada55d9f8114ed
            • MD5 SHA1 SHA512 SSDEEP

            usiugjc

            • Path C:\Users\Admin\AppData\Roaming\usiugjc
            • Size 335KB
            • SHA256 69a2a12a33442670cfa7d053a80a4168bc0694a5aa1383d3cfada55d9f8114ed
            • MD5 SHA1 SHA512 SSDEEP

            memory/2620-133-0x00000000005B0000-0x00000000005B9000-memory.dmp

            memory/2620-134-0x0000000000400000-0x000000000045B000-memory.dmp

            memory/2620-135-0x0000000000400000-0x000000000045B000-memory.dmp

            memory/2620-132-0x00000000005ED000-0x0000000000602000-memory.dmp

            memory/3184-168-0x0000017282650000-0x000001728290B000-memory.dmp

            memory/3184-165-0x0000017283F20000-0x0000017284060000-memory.dmp

            memory/3184-167-0x0000017283F20000-0x0000017284060000-memory.dmp

            memory/3184-166-0x0000000000210000-0x00000000004B9000-memory.dmp

            memory/3276-141-0x0000000000400000-0x00000000008EF000-memory.dmp

            memory/3276-148-0x0000000000400000-0x00000000008EF000-memory.dmp

            memory/3276-139-0x0000000002575000-0x00000000028F8000-memory.dmp

            memory/3276-140-0x0000000002900000-0x0000000002DE3000-memory.dmp

            memory/3540-158-0x0000000000400000-0x000000000045B000-memory.dmp

            memory/3540-152-0x000000000070D000-0x0000000000722000-memory.dmp

            memory/3540-153-0x0000000000400000-0x000000000045B000-memory.dmp

            memory/4100-159-0x00000000041E0000-0x0000000004320000-memory.dmp

            memory/4100-161-0x00000000041E0000-0x0000000004320000-memory.dmp

            memory/4100-156-0x00000000041E0000-0x0000000004320000-memory.dmp

            memory/4100-149-0x00000000023D0000-0x000000000281F000-memory.dmp

            memory/4100-160-0x00000000041E0000-0x0000000004320000-memory.dmp

            memory/4100-162-0x00000000041E0000-0x0000000004320000-memory.dmp

            memory/4100-146-0x00000000023D0000-0x000000000281F000-memory.dmp

            memory/4100-157-0x00000000041E0000-0x0000000004320000-memory.dmp

            memory/4100-164-0x0000000004259000-0x000000000425B000-memory.dmp

            memory/4100-155-0x00000000035C0000-0x0000000004120000-memory.dmp

            memory/4100-154-0x00000000035C0000-0x0000000004120000-memory.dmp

            memory/4100-147-0x00000000023D0000-0x000000000281F000-memory.dmp

            memory/4100-169-0x00000000035C0000-0x0000000004120000-memory.dmp