Analysis

  • max time kernel
    161s
  • max time network
    167s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20/01/2023, 02:57

General

  • Target
    file.exe
  • Size 191KB
  • Sample230120-dfkvrabd95
  • SHA256 647565da343844bb25318202324106be70435f0d7accbcba2bbbd4353460d422
  • 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 3 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 1 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 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 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 23 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:4844
  • C:\Users\Admin\AppData\Local\Temp\1983.exe
    C:\Users\Admin\AppData\Local\Temp\1983.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:3524
    • C:\Windows\SysWOW64\rundll32.exe
      "C:\Windows\system32\rundll32.exe" "C:\Users\Admin\AppData\Local\Temp\Thhqeqq.tmp",Yeytaeyds
      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:4132
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" "C:\Windows\system32\shell32.dll",#61 13854
        3⤵
        • Modifies registry class
        • Suspicious use of FindShellTrayWindow
        PID:4084
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /End /tn \Microsoft\Windows\Wininet\CacheTask
        3⤵
          PID:4868
        • C:\Windows\SysWOW64\schtasks.exe
          schtasks /Run /tn \Microsoft\Windows\Wininet\CacheTask
          3⤵
            PID:3700
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3524 -s 532
          2⤵
          • Program crash
          PID:380
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 3524 -ip 3524
        1⤵
          PID:5004
        • C:\Windows\System32\rundll32.exe
          C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
          1⤵
            PID:736
          • C:\Windows\SysWOW64\svchost.exe
            C:\Windows\SysWOW64\svchost.exe -k LocalService
            1⤵
              PID:4844

            Network

                  MITRE ATT&CK Enterprise v6

                  Replay Monitor

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                  Downloads

                  Microsoft.VCLibs.x86.14.00..dll

                  • Path C:\Program Files (x86)\Google\Update\Microsoft.VCLibs.x86.14.00..dll
                  • Size 762KB
                  • SHA256 000d222e4137632e0ad68af9cf662fd09552c951993fa68e2d22245ab2aa1125
                  • MD5 SHA1 SHA512 SSDEEP

                  Tqeowahqrywaui.tmp

                  • Path C:\ProgramData\{20975B9B-A8E0-9ADF-1023-6C9A2360079C}\Tqeowahqrywaui.tmp
                  • Size 3.5MB
                  • SHA256 fc397ec5c1b2c0eabbbedd71789a00f2fc307be81024dc47357c84fbe6966fb9
                  • MD5 SHA1 SHA512 SSDEEP

                  1983.exe

                  • Path C:\Users\Admin\AppData\Local\Temp\1983.exe
                  • Size 1.0MB
                  • SHA256 6d8a7be8fe2431d6c467176de5fa8c467fe0922178607e0f3ced802523bb8f0f
                  • MD5 SHA1 SHA512 SSDEEP

                  1983.exe

                  • Path C:\Users\Admin\AppData\Local\Temp\1983.exe
                  • Size 1.0MB
                  • SHA256 6d8a7be8fe2431d6c467176de5fa8c467fe0922178607e0f3ced802523bb8f0f
                  • MD5 SHA1 SHA512 SSDEEP

                  Thhqeqq.tmp

                  • Path C:\Users\Admin\AppData\Local\Temp\Thhqeqq.tmp
                  • Size 762KB
                  • SHA256 fdafcea4a906ec7204c7b6991ca6c9640c9a54f1679bc1df6684f6716cef56ef
                  • MD5 SHA1 SHA512 SSDEEP

                  Thhqeqq.tmp

                  • Path C:\Users\Admin\AppData\Local\Temp\Thhqeqq.tmp
                  • Size 762KB
                  • SHA256 fdafcea4a906ec7204c7b6991ca6c9640c9a54f1679bc1df6684f6716cef56ef
                  • MD5 SHA1 SHA512 SSDEEP

                  microsoft.vclibs.x86.14.00..dll

                  • Path \??\c:\program files (x86)\google\update\microsoft.vclibs.x86.14.00..dll
                  • Size 762KB
                  • SHA256 000d222e4137632e0ad68af9cf662fd09552c951993fa68e2d22245ab2aa1125
                  • MD5 SHA1 SHA512 SSDEEP

                  memory/3524-145-0x0000000000400000-0x0000000002C6C000-memory.dmp

                  memory/3524-143-0x000000000496E000-0x0000000004A52000-memory.dmp

                  memory/3524-144-0x0000000004A60000-0x0000000004B86000-memory.dmp

                  memory/4084-157-0x00000000008E0000-0x0000000000B7F000-memory.dmp

                  memory/4084-158-0x00000203F1D90000-0x00000203F2040000-memory.dmp

                  memory/4084-156-0x00000203F1C10000-0x00000203F1D50000-memory.dmp

                  memory/4084-155-0x00000203F1C10000-0x00000203F1D50000-memory.dmp

                  memory/4132-147-0x0000000004D00000-0x000000000587C000-memory.dmp

                  memory/4132-152-0x00000000059E0000-0x0000000005B20000-memory.dmp

                  memory/4132-153-0x00000000059E0000-0x0000000005B20000-memory.dmp

                  memory/4132-148-0x00000000059E0000-0x0000000005B20000-memory.dmp

                  memory/4132-149-0x00000000059E0000-0x0000000005B20000-memory.dmp

                  memory/4132-151-0x00000000059E0000-0x0000000005B20000-memory.dmp

                  memory/4132-146-0x0000000004D00000-0x000000000587C000-memory.dmp

                  memory/4132-150-0x00000000059E0000-0x0000000005B20000-memory.dmp

                  memory/4132-161-0x0000000004D00000-0x000000000587C000-memory.dmp

                  memory/4844-133-0x0000000002BA0000-0x0000000002CA0000-memory.dmp

                  memory/4844-136-0x0000000000400000-0x0000000002B9A000-memory.dmp

                  memory/4844-135-0x0000000000400000-0x0000000002B9A000-memory.dmp

                  memory/4844-134-0x0000000002D10000-0x0000000002D19000-memory.dmp