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maldoc indirect function call 3

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: 2026-05-13T11:00:00Z · Confidence: medium

Hunt Hypothesis

Indirect function calls in malicious documents may indicate the use of evasion techniques to bypass standard detection mechanisms. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify potential malware activity that evades traditional signature-based detection.

YARA Rule

rule maldoc_indirect_function_call_3 : maldoc
{
    meta:
        author = "Didier Stevens (https://DidierStevens.com)"
    strings:
        $a = {FF B7 ?? ?? ?? ?? FF 57 ??}
    condition:
        $a
}

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

Original source: https://github.com/Yara-Rules/rules/blob/main/maldocs/maldoc_somerules.yar