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PellesC450DLLX86CRTLIB

yara LOW Yara-Rules
community
This rule was pulled from an open-source repository and enriched with AI. Validate in a test environment before deploying to production.
View original rule at Yara-Rules →
Retrieved: 2026-08-25T11:00:00Z · Confidence: medium

Hunt Hypothesis

This detection identifies potential adversary activity involving the use of the Pelles C 4.50 x86 CRT library DLL, which may indicate the execution of custom or obfuscated tools designed to evade standard signature-based defenses. SOC teams should proactively hunt for this indicator in Azure Sentinel to uncover stealthy lateral movement or initial access attempts that leverage less common development libraries often overlooked by baseline monitoring.

YARA Rule

rule PellesC450DLLX86CRTLIB
{
      meta:
		author="malware-lu"
strings:
		$a0 = { 55 89 E5 53 56 57 8B 5D 0C 8B 75 10 85 DB 75 0D 83 3D [4] 00 75 04 31 C0 EB 57 83 FB 01 74 05 83 FB 02 75 }

condition:
		$a0 at pe.entry_point
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 1 string patterns in its detection logic.

False Positive Guidance

Here are 3-5 specific false positive scenarios for the PellesC450DLLX86CRTLIB detection rule, along with recommended filters and exclusions:

Original source: https://github.com/Yara-Rules/rules/blob/main/packers/packer.yar