Analysis

  • max time kernel
    150s
  • max time network
    110s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03/11/2022, 03:49

General

  • Target
    835236203f46f0ad0ce44a8bfcf49793.exe
  • Size 293KB
  • Sample221103-edcl2aggbl
  • SHA256 d0320b423b161cff11093ebaa7c71a2db445650e5574dd5225a86dabc22d64aa
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Detects Smokeloader packer 1 IoCs
  • SmokeLoader

    Modular backdoor trojan in use since 2014.

  • Downloads MZ/PE file
  • Executes dropped EXE 2 IoCs
  • 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 6 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Checks processor information in registry 2 TTPs 52 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Modifies Internet Explorer settings 1 TTPs 4 IoCs
  • Modifies registry class 19 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: MapViewOfSection 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 18 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 7 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\835236203f46f0ad0ce44a8bfcf49793.exe
    "C:\Users\Admin\AppData\Local\Temp\835236203f46f0ad0ce44a8bfcf49793.exe"
    1⤵
    • Checks SCSI registry key(s)
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: MapViewOfSection
    PID:4872
  • C:\Users\Admin\AppData\Local\Temp\6D8F.exe
    C:\Users\Admin\AppData\Local\Temp\6D8F.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • Checks processor information in registry
    • Suspicious use of WriteProcessMemory
    PID:1740
    • C:\Windows\SysWOW64\rundll32.exe
      "C:\Windows\syswow64\rundll32.exe" "C:\Windows\syswow64\shell32.dll",#61
      2⤵
      • Checks processor information in registry
      • Modifies registry class
      • Suspicious use of FindShellTrayWindow
      PID:5056
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1740 -s 964
      2⤵
      • Program crash
      PID:1364
  • C:\Users\Admin\AppData\Roaming\twjhacb
    C:\Users\Admin\AppData\Roaming\twjhacb
    1⤵
    • Executes dropped EXE
    • Checks SCSI registry key(s)
    • Suspicious behavior: MapViewOfSection
    PID:1460
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1740 -ip 1740
    1⤵
      PID:3816

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          6D8F.exe

          • Path C:\Users\Admin\AppData\Local\Temp\6D8F.exe
          • Size 4.9MB
          • SHA256 a9dc9197d56a81f9b84ef4417c297f4e8cf1b31cfcb9908920b5cf8adf64c662
          • MD5 SHA1 SHA512 SSDEEP

          6D8F.exe

          • Path C:\Users\Admin\AppData\Local\Temp\6D8F.exe
          • Size 4.9MB
          • SHA256 a9dc9197d56a81f9b84ef4417c297f4e8cf1b31cfcb9908920b5cf8adf64c662
          • MD5 SHA1 SHA512 SSDEEP

          84c7bf32-db39-40e7-95b4-e9bdddb0a182.tmp

          • Path C:\Users\Admin\AppData\Local\Temp\84c7bf32-db39-40e7-95b4-e9bdddb0a182.tmp
          • Size 242KB
          • SHA256 81e3a4d43a73699e1b7781723f56b8717175c536685c5450122b30789464ad82
          • MD5 SHA1 SHA512 SSDEEP

          Microsoft .NET Framework 4.7.2 Setup_20220901_111028643.html

          • Path C:\Users\Admin\AppData\Local\Temp\Microsoft .NET Framework 4.7.2 Setup_20220901_111028643.html
          • Size 93KB
          • SHA256 e214a59029c370790b51dbfe163cbb8461452b37f78ad54a271167711b50c38b
          • MD5 SHA1 SHA512 SSDEEP

          Rpiidpytrto.tmp

          • Path C:\Users\Admin\AppData\Local\Temp\Rpiidpytrto.tmp
          • Size 3.5MB
          • SHA256 8c67a70fe070595fda6ec977af7da0085d40df299f04cdd5669156752fee3f31
          • MD5 SHA1 SHA512 SSDEEP

          dd_vcredistUI7626.txt

          • Path C:\Users\Admin\AppData\Local\Temp\dd_vcredistUI7626.txt
          • Size 11KB
          • SHA256 c1806d15c75249bf5c76a2119add70bc35932fa352195e869336c875729fd91b
          • MD5 SHA1 SHA512 SSDEEP

          twjhacb

          • Path C:\Users\Admin\AppData\Roaming\twjhacb
          • Size 293KB
          • SHA256 d0320b423b161cff11093ebaa7c71a2db445650e5574dd5225a86dabc22d64aa
          • MD5 SHA1 SHA512 SSDEEP

          twjhacb

          • Path C:\Users\Admin\AppData\Roaming\twjhacb
          • Size 293KB
          • SHA256 d0320b423b161cff11093ebaa7c71a2db445650e5574dd5225a86dabc22d64aa
          • MD5 SHA1 SHA512 SSDEEP

          memory/1460-173-0x0000000000400000-0x0000000002C37000-memory.dmp

          memory/1460-171-0x0000000000400000-0x0000000002C37000-memory.dmp

          memory/1460-170-0x0000000002D89000-0x0000000002D9E000-memory.dmp

          memory/1740-142-0x0000000000400000-0x00000000030CC000-memory.dmp

          memory/1740-143-0x0000000005F60000-0x0000000006AC9000-memory.dmp

          memory/1740-145-0x0000000006B90000-0x0000000006CD0000-memory.dmp

          memory/1740-146-0x0000000006B90000-0x0000000006CD0000-memory.dmp

          memory/1740-147-0x0000000006B90000-0x0000000006CD0000-memory.dmp

          memory/1740-149-0x0000000006B90000-0x0000000006CD0000-memory.dmp

          memory/1740-150-0x0000000006B90000-0x0000000006CD0000-memory.dmp

          memory/1740-148-0x0000000006B90000-0x0000000006CD0000-memory.dmp

          memory/1740-151-0x0000000006B90000-0x0000000006CD0000-memory.dmp

          memory/1740-152-0x0000000006B90000-0x0000000006CD0000-memory.dmp

          memory/1740-172-0x0000000000400000-0x00000000030CC000-memory.dmp

          memory/1740-169-0x0000000005F60000-0x0000000006AC9000-memory.dmp

          memory/1740-139-0x0000000004CC1000-0x000000000516B000-memory.dmp

          memory/1740-165-0x0000000000400000-0x00000000030CC000-memory.dmp

          memory/1740-144-0x0000000005F60000-0x0000000006AC9000-memory.dmp

          memory/1740-140-0x0000000005270000-0x00000000058C5000-memory.dmp

          memory/1740-141-0x0000000000400000-0x00000000030CC000-memory.dmp

          memory/4872-135-0x0000000000400000-0x0000000002C37000-memory.dmp

          memory/4872-133-0x0000000002CB0000-0x0000000002CB9000-memory.dmp

          memory/4872-134-0x0000000000400000-0x0000000002C37000-memory.dmp

          memory/4872-132-0x0000000002D88000-0x0000000002D9D000-memory.dmp

          memory/5056-164-0x00000000039C0000-0x0000000003B00000-memory.dmp

          memory/5056-157-0x00000000039C0000-0x0000000003B00000-memory.dmp

          memory/5056-154-0x0000000002D90000-0x00000000038F9000-memory.dmp

          memory/5056-168-0x0000000002D90000-0x00000000038F9000-memory.dmp

          memory/5056-155-0x00000000006D0000-0x000000000111A000-memory.dmp

          memory/5056-156-0x00000000039C0000-0x0000000003B00000-memory.dmp

          memory/5056-163-0x00000000039C0000-0x0000000003B00000-memory.dmp

          memory/5056-158-0x0000000002D90000-0x00000000038F9000-memory.dmp