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msvcrt WinXPx86

yara LOW Yara-Rules
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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 library on Windows XP x86 systems, which may indicate the use of legacy or obfuscated malware. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate threats that leverage outdated or less commonly monitored environments.

YARA Rule

rule msvcrt_WinXPx86 {
    meta:
        author = "Jaume Martin"
    condition:
        hash.md5(0, filesize) == "b68f72d77754f8b76168ced0924a4174"
}

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