Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04/01/2023, 03:10

General

  • Target
    file.exe
  • Size 366KB
  • Sample230104-dn17psdg33
  • SHA256 8534c823aa9df0d99bb1012a6fe3760c8a89970d86f5aa45619fcc2e1a0b7b9c
  • 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
  • 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
  • Drops file in Program Files directory 30 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 18 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 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:4816
  • C:\Users\Admin\AppData\Local\Temp\F3DA.exe
    C:\Users\Admin\AppData\Local\Temp\F3DA.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:4404
    • C:\Windows\SysWOW64\rundll32.exe
      "C:\Windows\system32\rundll32.exe" "C:\Users\Admin\AppData\Local\Temp\Oatedoqeryee.tmp",Yqiowyrat
      2⤵
      • Blocklisted process makes network request
      • Loads dropped DLL
      • Suspicious use of SetThreadContext
      • Drops file in Program Files directory
      • Checks processor information in registry
      • Suspicious use of WriteProcessMemory
      PID:5108
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" "C:\Windows\system32\shell32.dll",#61 30902
        3⤵
        • Modifies registry class
        • Suspicious use of FindShellTrayWindow
        PID:3800
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4404 -s 500
      2⤵
      • Program crash
      PID:4084
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 4404 -ip 4404
    1⤵
      PID:4628
    • C:\Windows\System32\rundll32.exe
      C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
      1⤵
        PID:2568

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            F3DA.exe

            • Path C:\Users\Admin\AppData\Local\Temp\F3DA.exe
            • Size 1.1MB
            • SHA256 429bdaddc2aca0e7d7a2cc049ff19241aa4241065799f9411a509ede455dbd4a
            • MD5 SHA1 SHA512 SSDEEP

            F3DA.exe

            • Path C:\Users\Admin\AppData\Local\Temp\F3DA.exe
            • Size 1.1MB
            • SHA256 429bdaddc2aca0e7d7a2cc049ff19241aa4241065799f9411a509ede455dbd4a
            • MD5 SHA1 SHA512 SSDEEP

            Oatedoqeryee.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\Oatedoqeryee.tmp
            • Size 718KB
            • SHA256 200911b8faaea3104d1b51231d534e615fe755dc84024c1029aeafe1f842206b
            • MD5 SHA1 SHA512 SSDEEP

            Oatedoqeryee.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\Oatedoqeryee.tmp
            • Size 718KB
            • SHA256 200911b8faaea3104d1b51231d534e615fe755dc84024c1029aeafe1f842206b
            • MD5 SHA1 SHA512 SSDEEP

            memory/3800-155-0x0000023C228D0000-0x0000023C22A10000-memory.dmp

            memory/3800-154-0x0000023C228D0000-0x0000023C22A10000-memory.dmp

            memory/3800-157-0x0000000000BD0000-0x0000000000E6D000-memory.dmp

            memory/3800-158-0x0000023C20E60000-0x0000023C2110E000-memory.dmp

            memory/4404-142-0x0000000004A96000-0x0000000004B65000-memory.dmp

            memory/4404-143-0x0000000004B70000-0x0000000004C7C000-memory.dmp

            memory/4404-144-0x0000000000400000-0x0000000002D07000-memory.dmp

            memory/4816-132-0x0000000002E0D000-0x0000000002E23000-memory.dmp

            memory/4816-135-0x0000000000400000-0x0000000002C4E000-memory.dmp

            memory/4816-134-0x0000000000400000-0x0000000002C4E000-memory.dmp

            memory/4816-133-0x0000000002DE0000-0x0000000002DE9000-memory.dmp

            memory/5108-150-0x0000000005520000-0x0000000005660000-memory.dmp

            memory/5108-151-0x0000000005520000-0x0000000005660000-memory.dmp

            memory/5108-152-0x0000000005520000-0x0000000005660000-memory.dmp

            memory/5108-149-0x0000000005520000-0x0000000005660000-memory.dmp

            memory/5108-147-0x0000000005520000-0x0000000005660000-memory.dmp

            memory/5108-148-0x0000000005520000-0x0000000005660000-memory.dmp

            memory/5108-156-0x0000000005599000-0x000000000559B000-memory.dmp

            memory/5108-146-0x0000000004880000-0x00000000053A0000-memory.dmp

            memory/5108-145-0x0000000004880000-0x00000000053A0000-memory.dmp

            memory/5108-159-0x0000000004880000-0x00000000053A0000-memory.dmp