Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03/01/2023, 15:46

General

  • Target
    file.exe
  • Size 319KB
  • Sample230103-s7mkzsfb2x
  • SHA256 156ae65baa366535481c018c2fbfcd34762ef86e736154cf9a2eaebf85daf585
  • 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 1 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Drops file in Program Files directory 16 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 25 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:3624
  • C:\Users\Admin\AppData\Local\Temp\ECC6.exe
    C:\Users\Admin\AppData\Local\Temp\ECC6.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:4712
    • C:\Windows\SysWOW64\rundll32.exe
      "C:\Windows\system32\rundll32.exe" "C:\Users\Admin\AppData\Local\Temp\Ewtotuso.tmp",Uehyouqapr
      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:3920
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" "C:\Windows\system32\shell32.dll",#61 13690
        3⤵
        • Modifies registry class
        • Suspicious use of FindShellTrayWindow
        PID:1652
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4712 -s 528
      2⤵
      • Program crash
      PID:4724
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4712 -ip 4712
    1⤵
      PID:484
    • C:\Windows\System32\rundll32.exe
      C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
      1⤵
        PID:3756

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            ECC6.exe

            • Path C:\Users\Admin\AppData\Local\Temp\ECC6.exe
            • Size 1.1MB
            • SHA256 e14c9ee8f777efea1a94a0c918110ca9ccefca7d568583e7147e2e6bedff6550
            • MD5 SHA1 SHA512 SSDEEP

            ECC6.exe

            • Path C:\Users\Admin\AppData\Local\Temp\ECC6.exe
            • Size 1.1MB
            • SHA256 e14c9ee8f777efea1a94a0c918110ca9ccefca7d568583e7147e2e6bedff6550
            • MD5 SHA1 SHA512 SSDEEP

            Ewtotuso.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\Ewtotuso.tmp
            • Size 806KB
            • SHA256 6bcd95f201895695b22dcec82f54e88d7bcae7b69dc670bf80b97c5eb84fedf0
            • MD5 SHA1 SHA512 SSDEEP

            Ewtotuso.tmp

            • Path C:\Users\Admin\AppData\Local\Temp\Ewtotuso.tmp
            • Size 806KB
            • SHA256 6bcd95f201895695b22dcec82f54e88d7bcae7b69dc670bf80b97c5eb84fedf0
            • MD5 SHA1 SHA512 SSDEEP

            memory/1652-160-0x000002242EF70000-0x000002242F229000-memory.dmp

            memory/1652-157-0x0000000000CC0000-0x0000000000F68000-memory.dmp

            memory/1652-158-0x000002242EF70000-0x000002242F229000-memory.dmp

            memory/1652-155-0x00000224309D0000-0x0000022430B10000-memory.dmp

            memory/1652-154-0x00000224309D0000-0x0000022430B10000-memory.dmp

            memory/3624-135-0x0000000000400000-0x0000000002C42000-memory.dmp

            memory/3624-134-0x0000000000400000-0x0000000002C42000-memory.dmp

            memory/3624-132-0x0000000002D79000-0x0000000002D8E000-memory.dmp

            memory/3624-133-0x0000000002D00000-0x0000000002D09000-memory.dmp

            memory/3920-146-0x0000000006660000-0x00000000071BD000-memory.dmp

            memory/3920-148-0x00000000048A0000-0x00000000049E0000-memory.dmp

            memory/3920-149-0x00000000048A0000-0x00000000049E0000-memory.dmp

            memory/3920-150-0x00000000048A0000-0x00000000049E0000-memory.dmp

            memory/3920-151-0x00000000048A0000-0x00000000049E0000-memory.dmp

            memory/3920-152-0x00000000048A0000-0x00000000049E0000-memory.dmp

            memory/3920-147-0x00000000048A0000-0x00000000049E0000-memory.dmp

            memory/3920-145-0x0000000006660000-0x00000000071BD000-memory.dmp

            memory/3920-159-0x0000000006660000-0x00000000071BD000-memory.dmp

            memory/3920-156-0x0000000004919000-0x000000000491B000-memory.dmp

            memory/4712-143-0x0000000004B10000-0x0000000004C37000-memory.dmp

            memory/4712-142-0x0000000004A1A000-0x0000000004B00000-memory.dmp

            memory/4712-144-0x0000000000400000-0x0000000002D14000-memory.dmp