Analysis

  • max time kernel
    146s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09/01/2023, 12:41

General

  • Target
    file.exe
  • Size 326KB
  • Sample230109-pws2vahf3x
  • SHA256 e8d80e726e802a57312c8a94e0c867c67481ba8da9abadc3dde6828040689cd8
  • 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 13 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 26 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:4872
  • C:\Users\Admin\AppData\Local\Temp\C364.exe
    C:\Users\Admin\AppData\Local\Temp\C364.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:1420
    • C:\Windows\SysWOW64\rundll32.exe
      "C:\Windows\system32\rundll32.exe" "C:\Users\Admin\AppData\Local\Temp\Wtfoiq.tmp",Iyidwoiowsw
      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:2040
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" "C:\Windows\system32\shell32.dll",#61 15591
        3⤵
        • Modifies registry class
        • Suspicious use of FindShellTrayWindow
        PID:3648
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1420 -s 540
      2⤵
      • Program crash
      PID:4752
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 1420 -ip 1420
    1⤵
      PID:1144
    • C:\Windows\System32\rundll32.exe
      C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
      1⤵
        PID:4504
      • C:\Windows\SysWOW64\svchost.exe
        C:\Windows\SysWOW64\svchost.exe -k LocalService
        1⤵
          PID:2912
          • C:\Windows\SysWOW64\rundll32.exe
            "C:\Windows\system32\rundll32.exe" "c:\program files (x86)\windowspowershell\modules\ace.dll",LSYH
            2⤵
              PID:2868

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                ACE.dll

                • Path C:\Program Files (x86)\WindowsPowerShell\Modules\ACE.dll
                • Size 714KB
                • SHA256 149cd6837df72f86257b1d8cc38c0db90696f42f47e56153f035bfc5d9dd4e11
                • MD5 SHA1 SHA512 SSDEEP

                ACE.dll

                • Path C:\Program Files (x86)\WindowsPowerShell\Modules\ACE.dll
                • Size 714KB
                • SHA256 149cd6837df72f86257b1d8cc38c0db90696f42f47e56153f035bfc5d9dd4e11
                • MD5 SHA1 SHA512 SSDEEP

                Microsoft.MSPaint_2019.729.2301.0_neutral_~_8wekyb3d8bbwe.xml

                • Path C:\ProgramData\{B7E8E476-349D-60AA-651B-798B40E3CAEC}\Microsoft.MSPaint_2019.729.2301.0_neutral_~_8wekyb3d8bbwe.xml
                • Size 7KB
                • SHA256 581fd3d9aa551599bd691b5b23cdc51c48f7f3a65955adf1e1d0fef0a8cfb8b8
                • MD5 SHA1 SHA512 SSDEEP

                Microsoft.MicrosoftStickyNotes_3.6.73.0_neutral_split.scale-100_8wekyb3d8bbwe.xml

                • Path C:\ProgramData\{B7E8E476-349D-60AA-651B-798B40E3CAEC}\Microsoft.MicrosoftStickyNotes_3.6.73.0_neutral_split.scale-100_8wekyb3d8bbwe.xml
                • Size 827B
                • SHA256 df0af4b8242dcab107aab8d00add27b9797c00002669ff953667869abb6c77c6
                • MD5 SHA1 SHA512

                Policy.vpol

                • Path C:\ProgramData\{B7E8E476-349D-60AA-651B-798B40E3CAEC}\Policy.vpol
                • Size 444B
                • SHA256 b798f6c4bba8fe6fd7f4a7bf5f599d6de87ca2684d20487704573d1cf51e04d7
                • MD5 SHA1 SHA512

                Rwdfud.tmp

                • Path C:\ProgramData\{B7E8E476-349D-60AA-651B-798B40E3CAEC}\Rwdfud.tmp
                • Size 3.5MB
                • SHA256 d458dc181fd21e5a1d0e3d51bf96010846e547f6580fd1f9d8b24e5f43a62cb2
                • MD5 SHA1 SHA512 SSDEEP

                behavior.xml

                • Path C:\ProgramData\{B7E8E476-349D-60AA-651B-798B40E3CAEC}\behavior.xml
                • Size 1KB
                • SHA256 7cfdc107f1bc076ca39ee36960bbb1d64a6c9faac9ba73a106f6e85224da4a1b
                • MD5 SHA1 SHA512

                folder.ico

                • Path C:\ProgramData\{B7E8E476-349D-60AA-651B-798B40E3CAEC}\folder.ico
                • Size 52KB
                • SHA256 bef53904908769ceeb60f8e0976c3194e73534f00f4afb65497c2091121b98b2
                • MD5 SHA1 SHA512 SSDEEP

                C364.exe

                • Path C:\Users\Admin\AppData\Local\Temp\C364.exe
                • Size 1.1MB
                • SHA256 0749948b3bf98c2c5bc03060634d215542f87dab8a92677f1885cf0b9ea36f39
                • MD5 SHA1 SHA512 SSDEEP

                C364.exe

                • Path C:\Users\Admin\AppData\Local\Temp\C364.exe
                • Size 1.1MB
                • SHA256 0749948b3bf98c2c5bc03060634d215542f87dab8a92677f1885cf0b9ea36f39
                • MD5 SHA1 SHA512 SSDEEP

                Wtfoiq.tmp

                • Path C:\Users\Admin\AppData\Local\Temp\Wtfoiq.tmp
                • Size 714KB
                • SHA256 d0ac0e9021c6e231c60256198309b7f72ce4c5e772cf343b5456c2ce0664b9bd
                • MD5 SHA1 SHA512 SSDEEP

                Wtfoiq.tmp

                • Path C:\Users\Admin\AppData\Local\Temp\Wtfoiq.tmp
                • Size 714KB
                • SHA256 d0ac0e9021c6e231c60256198309b7f72ce4c5e772cf343b5456c2ce0664b9bd
                • MD5 SHA1 SHA512 SSDEEP

                ace.dll

                • Path \??\c:\program files (x86)\windowspowershell\modules\ace.dll
                • Size 714KB
                • SHA256 149cd6837df72f86257b1d8cc38c0db90696f42f47e56153f035bfc5d9dd4e11
                • MD5 SHA1 SHA512 SSDEEP

                memory/1420-142-0x00000000021D6000-0x00000000022AA000-memory.dmp

                memory/1420-144-0x0000000000400000-0x0000000000517000-memory.dmp

                memory/1420-143-0x0000000002360000-0x0000000002475000-memory.dmp

                memory/2040-145-0x0000000004B60000-0x00000000056A1000-memory.dmp

                memory/2040-148-0x00000000045C0000-0x0000000004700000-memory.dmp

                memory/2040-151-0x00000000045C0000-0x0000000004700000-memory.dmp

                memory/2040-147-0x00000000045C0000-0x0000000004700000-memory.dmp

                memory/2040-152-0x00000000045C0000-0x0000000004700000-memory.dmp

                memory/2040-150-0x00000000045C0000-0x0000000004700000-memory.dmp

                memory/2040-156-0x0000000004639000-0x000000000463B000-memory.dmp

                memory/2040-149-0x0000000004639000-0x000000000463B000-memory.dmp

                memory/2040-146-0x00000000045C0000-0x0000000004700000-memory.dmp

                memory/2040-159-0x0000000004B60000-0x00000000056A1000-memory.dmp

                memory/2868-173-0x0000000005070000-0x0000000005BB1000-memory.dmp

                memory/2868-172-0x0000000005070000-0x0000000005BB1000-memory.dmp

                memory/2912-163-0x0000000003A40000-0x0000000004581000-memory.dmp

                memory/2912-171-0x0000000003A40000-0x0000000004581000-memory.dmp

                memory/3648-154-0x0000018B09490000-0x0000018B095D0000-memory.dmp

                memory/3648-158-0x0000018B07A30000-0x0000018B07CE2000-memory.dmp

                memory/3648-155-0x0000018B09490000-0x0000018B095D0000-memory.dmp

                memory/3648-157-0x0000000000720000-0x00000000009C1000-memory.dmp

                memory/4872-132-0x00000000006CE000-0x00000000006E3000-memory.dmp

                memory/4872-135-0x0000000000400000-0x0000000000457000-memory.dmp

                memory/4872-134-0x0000000000400000-0x0000000000457000-memory.dmp

                memory/4872-133-0x0000000002190000-0x0000000002199000-memory.dmp