Analysis

  • max time kernel
    150s
  • max time network
    151s
  • 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, 14:08

General

  • Target
    file.exe
  • Size 334KB
  • Sample230103-rfjvcaeh2v
  • SHA256 8cb06e84293839d0b84824de975bc40cbfb9b7961fc795d6332e7a88c8bf6fc4
  • 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 2 IoCs
  • Loads dropped DLL 1 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 19 IoCs

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

  • Modifies Internet Explorer settings 1 TTPs 4 IoCs
  • Modifies registry class 31 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 28 IoCs
  • Suspicious use of FindShellTrayWindow 3 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:4532
  • C:\Users\Admin\AppData\Local\Temp\FBE9.exe
    C:\Users\Admin\AppData\Local\Temp\FBE9.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:3652
    • 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
      • Checks processor information in registry
      • Suspicious use of WriteProcessMemory
      PID:4468
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" "C:\Windows\system32\shell32.dll",#61 13714
        3⤵
        • Modifies registry class
        • Suspicious use of FindShellTrayWindow
        PID:4832
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3652 -s 560
      2⤵
      • Program crash
      PID:1392
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 3652 -ip 3652
    1⤵
      PID:3776
    • C:\Windows\System32\rundll32.exe
      C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
      1⤵
        PID:1796
      • C:\Users\Admin\AppData\Roaming\bsibgaa
        C:\Users\Admin\AppData\Roaming\bsibgaa
        1⤵
        • Executes dropped EXE
        • Checks SCSI registry key(s)
        • Suspicious behavior: MapViewOfSection
        PID:2108

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            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

            FBE9.exe

            • Path C:\Users\Admin\AppData\Local\Temp\FBE9.exe
            • Size 1.1MB
            • SHA256 b645ab8a1b64fc9f188c488cddd72969f708e673b2b557ed65d87a0278753378
            • MD5 SHA1 SHA512 SSDEEP

            FBE9.exe

            • Path C:\Users\Admin\AppData\Local\Temp\FBE9.exe
            • Size 1.1MB
            • SHA256 b645ab8a1b64fc9f188c488cddd72969f708e673b2b557ed65d87a0278753378
            • MD5 SHA1 SHA512 SSDEEP

            bsibgaa

            • Path C:\Users\Admin\AppData\Roaming\bsibgaa
            • Size 334KB
            • SHA256 8cb06e84293839d0b84824de975bc40cbfb9b7961fc795d6332e7a88c8bf6fc4
            • MD5 SHA1 SHA512 SSDEEP

            bsibgaa

            • Path C:\Users\Admin\AppData\Roaming\bsibgaa
            • Size 334KB
            • SHA256 8cb06e84293839d0b84824de975bc40cbfb9b7961fc795d6332e7a88c8bf6fc4
            • MD5 SHA1 SHA512 SSDEEP

            memory/2108-163-0x0000000002CB8000-0x0000000002CCE000-memory.dmp

            memory/2108-164-0x0000000000400000-0x0000000002C46000-memory.dmp

            memory/2108-165-0x0000000000400000-0x0000000002C46000-memory.dmp

            memory/3652-139-0x000000000495F000-0x0000000004A45000-memory.dmp

            memory/3652-140-0x0000000004A80000-0x0000000004BA7000-memory.dmp

            memory/3652-144-0x0000000000400000-0x0000000002D17000-memory.dmp

            memory/3652-145-0x0000000000400000-0x0000000002D17000-memory.dmp

            memory/4468-148-0x0000000004410000-0x0000000004550000-memory.dmp

            memory/4468-153-0x0000000004410000-0x0000000004550000-memory.dmp

            memory/4468-160-0x00000000062E0000-0x0000000006E3D000-memory.dmp

            memory/4468-149-0x0000000004410000-0x0000000004550000-memory.dmp

            memory/4468-150-0x0000000004410000-0x0000000004550000-memory.dmp

            memory/4468-151-0x0000000004410000-0x0000000004550000-memory.dmp

            memory/4468-152-0x0000000004410000-0x0000000004550000-memory.dmp

            memory/4468-147-0x00000000062E0000-0x0000000006E3D000-memory.dmp

            memory/4468-146-0x00000000062E0000-0x0000000006E3D000-memory.dmp

            memory/4468-157-0x0000000004489000-0x000000000448B000-memory.dmp

            memory/4532-134-0x0000000000400000-0x0000000002C46000-memory.dmp

            memory/4532-135-0x0000000000400000-0x0000000002C46000-memory.dmp

            memory/4532-133-0x0000000004840000-0x0000000004849000-memory.dmp

            memory/4532-132-0x0000000002EB9000-0x0000000002ECF000-memory.dmp

            memory/4832-155-0x000001DB289C0000-0x000001DB28B00000-memory.dmp

            memory/4832-159-0x000001DB28B10000-0x000001DB28DC9000-memory.dmp

            memory/4832-158-0x00000000006C0000-0x0000000000968000-memory.dmp

            memory/4832-156-0x000001DB289C0000-0x000001DB28B00000-memory.dmp