← Back to SOC feed Coverage →

msvcrt WIN8AMD64

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: 2026-05-24T11:00:00Z · Confidence: medium

Hunt Hypothesis

The detection rule identifies potential malicious activity involving the msvcrt_WIN8AMD64 YARA signature, which may indicate the presence of obfuscated or custom malware leveraging Windows runtime libraries. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate advanced threats that may evade traditional detection methods.

YARA Rule

rule msvcrt_WIN8AMD64 {
    meta:
        author = "Jaume Martin"
    condition:
        hash.md5(0, filesize) == "33c59fcdf027470e0ab1d366f54a6ebf"
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

False Positive Guidance

Original source: https://github.com/Yara-Rules/rules/blob/main/malware/APT_Grasshopper.yar