main/Windows Sysinternals Sigcheck

Sysinternals - Sigcheck

Sigcheck is a command-line utility that shows file version number, timestamp information, and digital signature details, including certificate chains. It also includes an option to check a file’s status on VirusTotal, a site that performs automated file scanning against over 40 antivirus engines, and an option to upload a file for scanning.

Description

Sysinternals Sigcheck - Official documentation.

Wazuh Integration Wazuh Capability: Wodles Command

Log Output: Active Response Log

MITRE: T1036 Rationale: Identify executables in Users folders and run their file hashes in VirusTotal.

Edit agent configuration in Wazuh manager (shared/groups)

(/var/ossec/etc/shared/your_windows_agents_group/agent.conf)

 <disabled>no</disabled>
 <tag>sigcheck</tag>
 <command>Powershell.exe -executionpolicy bypass -File "C:\Program Files\Sysinternals\sigcheck.ps1"</command>
 <interval>1d</interval>
 <ignore_output>yes</ignore_output>
 <run_on_start>yes</run_on_start>
 <timeout>0</timeout>
</wodle>

File “sigcheck.ps1”:

################################
##########
# Sigcheck will be run against all executables found in C:\Users\ and subfolders
# Script execution triggered by Wazuh Manager, wodles-command
# Output converted to JSON and appended to active-responses.log
##########
# If Sigcheck already running do nothing
$ErrorActionPreference = "SilentlyContinue"
$sigcheck_running = Get-Process sigcheck -ErrorAction SilentlyContinue
if ($sigcheck_running) { Exit }
# RUN SIGCHECK AND STORE CSV
$Sigcheck_Output_CSV = c:\"Program Files"\Sysinternals\sigcheck.exe -nobanner -accepteula -u -c -v -vt -e -s C:\Users\
# REMOVE SPACES IN CSV HEADER AND CONVERT TO ARRAY
$Sigcheck_Output_Array = $Sigcheck_Output_CSV.PSObject.BaseObject.Trim(' ') -Replace '\s','' | ConvertFrom-Csv
# GO THRU THE ARRAY, CONVERT TO JSON AND APPEND TO active-responses.log
$count = 0
Foreach ($item in $Sigcheck_Output_Array) {
# Discard alert if No VT Hits
 if ((-Not ($item."VTdetection" -match '^0')) -And ($item."VTdetection" -match '^\d+')) {
  echo $item | ConvertTo-Json -Compress | Out-File -width 2000 C:\"Program Files (x86)"\ossec-agent\active-response\active-responses.log -Append -Encoding ascii
# Sleep 2 seconds every 5 runs
 if(++$count % 5 -eq 0) 
    {
        Start-Sleep -Seconds 2
    }
 }
}

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