Analysis

  • max time kernel
    150s
  • max time network
    124s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    16/11/2022, 03:01

General

  • Target
    file.exe
  • Size 195KB
  • Sample221116-dhwp2agh77
  • SHA256 194f86511caaeb92269aec4b3fef6cf37680a4868564e25814ead551df22526c
  • 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 21 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:2424
  • C:\Users\Admin\AppData\Local\Temp\F429.exe
    C:\Users\Admin\AppData\Local\Temp\F429.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:5012
    • C:\Windows\SysWOW64\rundll32.exe
      C:\Windows\system32\rundll32.exe C:\Users\Admin\AppData\Local\Temp\Hefurhy.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:560
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" "C:\Windows\system32\shell32.dll",#61 16314
        3⤵
        • Modifies registry class
        • Suspicious use of FindShellTrayWindow
        PID:4236
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /End /tn \Microsoft\Windows\Wininet\CacheTask
        3⤵
          PID:4548
        • C:\Windows\SysWOW64\schtasks.exe
          schtasks /Run /tn \Microsoft\Windows\Wininet\CacheTask
          3⤵
            PID:3460
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5012 -s 512
          2⤵
          • Program crash
          PID:4324
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 5012 -ip 5012
        1⤵
          PID:4164
        • C:\Windows\System32\rundll32.exe
          C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
          1⤵
            PID:4288

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                F429.exe

                • Path C:\Users\Admin\AppData\Local\Temp\F429.exe
                • Size 2.9MB
                • SHA256 98c5914e75a64084ffc10c3af800789a3706fd0f8f7d417d2cf36ef65d348ed7
                • MD5 SHA1 SHA512 SSDEEP

                F429.exe

                • Path C:\Users\Admin\AppData\Local\Temp\F429.exe
                • Size 2.9MB
                • SHA256 98c5914e75a64084ffc10c3af800789a3706fd0f8f7d417d2cf36ef65d348ed7
                • MD5 SHA1 SHA512 SSDEEP

                Hefurhy.dll

                • Path C:\Users\Admin\AppData\Local\Temp\Hefurhy.dll
                • Size 4.3MB
                • SHA256 1d7e18a84d811126185fc9e3fd9f39b6ae7caeb7e594fb5cac8ea57d68b3473c
                • MD5 SHA1 SHA512 SSDEEP

                Hefurhy.dll

                • Path C:\Users\Admin\AppData\Local\Temp\Hefurhy.dll
                • Size 4.3MB
                • SHA256 1d7e18a84d811126185fc9e3fd9f39b6ae7caeb7e594fb5cac8ea57d68b3473c
                • MD5 SHA1 SHA512 SSDEEP

                Hefurhy.dll

                • Path C:\Users\Admin\AppData\Local\Temp\Hefurhy.dll
                • Size 4.3MB
                • SHA256 1d7e18a84d811126185fc9e3fd9f39b6ae7caeb7e594fb5cac8ea57d68b3473c
                • MD5 SHA1 SHA512 SSDEEP

                memory/560-146-0x0000000002560000-0x00000000029B1000-memory.dmp

                memory/560-156-0x0000000004E10000-0x0000000004F50000-memory.dmp

                memory/560-165-0x0000000003790000-0x000000000431C000-memory.dmp

                memory/560-158-0x00000000043E0000-0x0000000004520000-memory.dmp

                memory/560-157-0x00000000043E0000-0x0000000004520000-memory.dmp

                memory/560-155-0x0000000004E10000-0x0000000004F50000-memory.dmp

                memory/560-154-0x00000000043E0000-0x0000000004520000-memory.dmp

                memory/560-153-0x00000000043E0000-0x0000000004520000-memory.dmp

                memory/560-152-0x0000000003790000-0x000000000431C000-memory.dmp

                memory/560-147-0x0000000002560000-0x00000000029B1000-memory.dmp

                memory/560-151-0x0000000003790000-0x000000000431C000-memory.dmp

                memory/560-149-0x0000000002560000-0x00000000029B1000-memory.dmp

                memory/560-150-0x0000000003790000-0x000000000431C000-memory.dmp

                memory/2424-133-0x00000000006F0000-0x00000000006F9000-memory.dmp

                memory/2424-134-0x0000000000400000-0x0000000000596000-memory.dmp

                memory/2424-135-0x0000000000400000-0x0000000000596000-memory.dmp

                memory/2424-132-0x00000000007D9000-0x00000000007EA000-memory.dmp

                memory/4236-163-0x0000000000150000-0x00000000003E2000-memory.dmp

                memory/4236-164-0x0000022DC73F0000-0x0000022DC7693000-memory.dmp

                memory/4236-160-0x0000022DC8E50000-0x0000022DC8F90000-memory.dmp

                memory/4236-161-0x0000022DC8E50000-0x0000022DC8F90000-memory.dmp

                memory/5012-140-0x0000000002800000-0x0000000002B01000-memory.dmp

                memory/5012-148-0x0000000000400000-0x0000000000849000-memory.dmp

                memory/5012-141-0x0000000000400000-0x0000000000849000-memory.dmp

                memory/5012-139-0x000000000253C000-0x00000000027FF000-memory.dmp