Analysis

  • max time kernel
    150s
  • max time network
    129s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    15/11/2022, 16:04

General

  • Target
    78f1a272ec354e1b0b14bb6e44359fb7.exe
  • Size 194KB
  • Sample221115-thx6vsae3s
  • SHA256 44e018207fa09c3277f1e518e45d3e15caf0afe465d23f043eb01db033ae19d6
  • 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 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 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 16 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\78f1a272ec354e1b0b14bb6e44359fb7.exe
    "C:\Users\Admin\AppData\Local\Temp\78f1a272ec354e1b0b14bb6e44359fb7.exe"
    1⤵
    • Checks SCSI registry key(s)
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: MapViewOfSection
    PID:1808
  • C:\Users\Admin\AppData\Local\Temp\F36D.exe
    C:\Users\Admin\AppData\Local\Temp\F36D.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:220
    • C:\Windows\SysWOW64\rundll32.exe
      C:\Windows\system32\rundll32.exe C:\Users\Admin\AppData\Local\Temp\Hefurhy.dll,start
      2⤵
      • Blocklisted process makes network request
      • Loads dropped DLL
      • Suspicious use of SetThreadContext
      • Checks processor information in registry
      • Suspicious use of WriteProcessMemory
      PID:3724
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" "C:\Windows\system32\shell32.dll",#61 16333
        3⤵
        • Modifies registry class
        • Suspicious use of FindShellTrayWindow
        PID:4504
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 220 -s 516
      2⤵
      • Program crash
      PID:4356
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 220 -ip 220
    1⤵
      PID:1844
    • C:\Windows\System32\rundll32.exe
      C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
      1⤵
        PID:3840

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            F36D.exe

            • Path C:\Users\Admin\AppData\Local\Temp\F36D.exe
            • Size 2.9MB
            • SHA256 1d41774d196161056f0e6e17dc777ce22d6707afcd7cd70ccbf4631fbf45a8e2
            • MD5 SHA1 SHA512 SSDEEP

            F36D.exe

            • Path C:\Users\Admin\AppData\Local\Temp\F36D.exe
            • Size 2.9MB
            • SHA256 1d41774d196161056f0e6e17dc777ce22d6707afcd7cd70ccbf4631fbf45a8e2
            • MD5 SHA1 SHA512 SSDEEP

            Hefurhy.dll

            • Path C:\Users\Admin\AppData\Local\Temp\Hefurhy.dll
            • Size 4.3MB
            • SHA256 c3c72d7bac899ff8c7b827e107cd564cdc772b2f23cff8e7273d3654a8d7559f
            • MD5 SHA1 SHA512 SSDEEP

            Hefurhy.dll

            • Path C:\Users\Admin\AppData\Local\Temp\Hefurhy.dll
            • Size 4.3MB
            • SHA256 c3c72d7bac899ff8c7b827e107cd564cdc772b2f23cff8e7273d3654a8d7559f
            • MD5 SHA1 SHA512 SSDEEP

            Hefurhy.dll

            • Path C:\Users\Admin\AppData\Local\Temp\Hefurhy.dll
            • Size 4.3MB
            • SHA256 c3c72d7bac899ff8c7b827e107cd564cdc772b2f23cff8e7273d3654a8d7559f
            • MD5 SHA1 SHA512 SSDEEP

            memory/220-141-0x0000000000400000-0x0000000000849000-memory.dmp

            memory/220-139-0x0000000002571000-0x0000000002834000-memory.dmp

            memory/220-140-0x0000000002840000-0x0000000002B41000-memory.dmp

            memory/220-147-0x0000000000400000-0x0000000000849000-memory.dmp

            memory/1808-132-0x0000000000688000-0x0000000000699000-memory.dmp

            memory/1808-135-0x0000000000400000-0x0000000000596000-memory.dmp

            memory/1808-134-0x0000000000400000-0x0000000000596000-memory.dmp

            memory/1808-133-0x00000000022D0000-0x00000000022D9000-memory.dmp

            memory/3724-148-0x00000000021B0000-0x0000000002601000-memory.dmp

            memory/3724-158-0x0000000003F30000-0x0000000004070000-memory.dmp

            memory/3724-149-0x00000000021B0000-0x0000000002601000-memory.dmp

            memory/3724-150-0x00000000032E0000-0x0000000003E6C000-memory.dmp

            memory/3724-151-0x00000000032E0000-0x0000000003E6C000-memory.dmp

            memory/3724-152-0x00000000032E0000-0x0000000003E6C000-memory.dmp

            memory/3724-153-0x0000000003F30000-0x0000000004070000-memory.dmp

            memory/3724-154-0x0000000003F30000-0x0000000004070000-memory.dmp

            memory/3724-155-0x0000000003F30000-0x0000000004070000-memory.dmp

            memory/3724-156-0x0000000003F30000-0x0000000004070000-memory.dmp

            memory/3724-146-0x00000000021B0000-0x0000000002601000-memory.dmp

            memory/3724-157-0x0000000003F30000-0x0000000004070000-memory.dmp

            memory/3724-165-0x00000000032E0000-0x0000000003E6C000-memory.dmp

            memory/3724-160-0x0000000003FA9000-0x0000000003FAB000-memory.dmp

            memory/4504-162-0x000001EB27750000-0x000001EB279F3000-memory.dmp

            memory/4504-161-0x000001EB29010000-0x000001EB29150000-memory.dmp

            memory/4504-163-0x000001EB29010000-0x000001EB29150000-memory.dmp

            memory/4504-164-0x00000000002F0000-0x0000000000582000-memory.dmp

            memory/4504-166-0x000001EB27750000-0x000001EB279F3000-memory.dmp