Analysis

  • max time kernel
    151s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12/02/2023, 04:31

General

  • Target
    file.exe
  • Size 197KB
  • Sample230212-e5c2waef2z
  • SHA256 f332476a37fa86870eb0563e638376f6bc3e17956c7839aecb133596548e743b
  • 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
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs
  • Accesses Microsoft Outlook profiles 1 TTPs 4 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • 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 25 IoCs
  • Suspicious use of FindShellTrayWindow 10 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 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:3068
  • C:\Users\Admin\AppData\Local\Temp\55B1.exe
    C:\Users\Admin\AppData\Local\Temp\55B1.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:2836
    • C:\Windows\SysWOW64\rundll32.exe
      C:\Windows\system32\rundll32.exe C:\Users\Admin\AppData\Local\Temp\Dfsoeq.dll,start
      2⤵
      • Blocklisted process makes network request
      • Loads dropped DLL
      • Accesses Microsoft Outlook accounts
      • Accesses Microsoft Outlook profiles
      • Suspicious use of SetThreadContext
      • Checks processor information in registry
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of WriteProcessMemory
      • outlook_office_path
      • outlook_win_path
      PID:3732
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" "C:\Windows\system32\shell32.dll",#61 14148
        3⤵
        • Modifies registry class
        • Suspicious use of FindShellTrayWindow
        PID:1412
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /End /tn \Microsoft\Windows\Wininet\CacheTask
        3⤵
          PID:2200
        • C:\Windows\SysWOW64\schtasks.exe
          schtasks /Run /tn \Microsoft\Windows\Wininet\CacheTask
          3⤵
            PID:5084
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2836 -s 700
          2⤵
          • Program crash
          PID:4140
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 2836 -ip 2836
        1⤵
          PID:540
        • C:\Windows\System32\rundll32.exe
          C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
          1⤵
            PID:4880

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                55B1.exe

                • Path C:\Users\Admin\AppData\Local\Temp\55B1.exe
                • Size 3.6MB
                • SHA256 f660dd0fda92af8047a207da73f1fc7ef18182fa779d9a617825c22effa5537a
                • MD5 SHA1 SHA512 SSDEEP

                55B1.exe

                • Path C:\Users\Admin\AppData\Local\Temp\55B1.exe
                • Size 3.6MB
                • SHA256 f660dd0fda92af8047a207da73f1fc7ef18182fa779d9a617825c22effa5537a
                • MD5 SHA1 SHA512 SSDEEP

                Dfsoeq.dll

                • Path C:\Users\Admin\AppData\Local\Temp\Dfsoeq.dll
                • Size 4.3MB
                • SHA256 686d71fbfb5a32cf278032cf8df0d3af10322ff435ed17f2e669291cca4ea247
                • MD5 SHA1 SHA512 SSDEEP

                Dfsoeq.dll

                • Path C:\Users\Admin\AppData\Local\Temp\Dfsoeq.dll
                • Size 4.3MB
                • SHA256 686d71fbfb5a32cf278032cf8df0d3af10322ff435ed17f2e669291cca4ea247
                • MD5 SHA1 SHA512 SSDEEP

                Dfsoeq.dll

                • Path C:\Users\Admin\AppData\Local\Temp\Dfsoeq.dll
                • Size 4.3MB
                • SHA256 686d71fbfb5a32cf278032cf8df0d3af10322ff435ed17f2e669291cca4ea247
                • MD5 SHA1 SHA512 SSDEEP

                memory/1412-158-0x00000154A4FC0000-0x00000154A5100000-memory.dmp

                memory/1412-159-0x00000154A4FC0000-0x00000154A5100000-memory.dmp

                memory/1412-160-0x0000000000290000-0x0000000000531000-memory.dmp

                memory/1412-161-0x00000154A3560000-0x00000154A3812000-memory.dmp

                memory/2836-141-0x0000000000400000-0x0000000000AFF000-memory.dmp

                memory/2836-140-0x0000000002D70000-0x0000000003256000-memory.dmp

                memory/2836-139-0x00000000029DE000-0x0000000002D62000-memory.dmp

                memory/2836-147-0x0000000000400000-0x0000000000AFF000-memory.dmp

                memory/3068-132-0x0000000000A9D000-0x0000000000AB3000-memory.dmp

                memory/3068-135-0x0000000000400000-0x000000000078D000-memory.dmp

                memory/3068-134-0x0000000000400000-0x000000000078D000-memory.dmp

                memory/3068-133-0x0000000000910000-0x0000000000919000-memory.dmp

                memory/3732-148-0x0000000003390000-0x0000000003ED9000-memory.dmp

                memory/3732-153-0x0000000003FA0000-0x00000000040E0000-memory.dmp

                memory/3732-154-0x0000000003FA0000-0x00000000040E0000-memory.dmp

                memory/3732-155-0x0000000003FA0000-0x00000000040E0000-memory.dmp

                memory/3732-156-0x0000000003FA0000-0x00000000040E0000-memory.dmp

                memory/3732-151-0x0000000003FA0000-0x00000000040E0000-memory.dmp

                memory/3732-152-0x0000000003FA0000-0x00000000040E0000-memory.dmp

                memory/3732-150-0x0000000003390000-0x0000000003ED9000-memory.dmp

                memory/3732-149-0x0000000003390000-0x0000000003ED9000-memory.dmp

                memory/3732-146-0x00000000021D0000-0x0000000002624000-memory.dmp

                memory/3732-163-0x0000000003390000-0x0000000003ED9000-memory.dmp