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msvcrt Win7AMD64

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 hypothesis is that the detection of the msvcrt_Win7AMD64 YARA rule may indicate the presence of malicious code leveraging Windows 7-specific runtime libraries, potentially used for code obfuscation or execution in a restricted environment. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify potential advanced persistent threats or malware that may be evading traditional detection methods.

YARA Rule

rule msvcrt_Win7AMD64 {
    meta:
        author = "Jaume Martin"
    condition:
        hash.md5(0, filesize) == "c8fc794cc5a22b5a1e0803b0b8acce77"
}

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