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Detects EquationGroup Tool - April Leak

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: 2026-06-08T23:00:01Z · Confidence: medium

Hunt Hypothesis

The hypothesis is that the detection of EquationGroup Tool - April Leak indicates potential adversary use of sophisticated, legacy malware that may persist undetected in network environments. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate long-term threats that could evade traditional detection methods.

YARA Rule

rule EquationGroup_Toolset_Apr17_Educatedscholar_1_0_0 {
   meta:
      description = "Detects EquationGroup Tool - April Leak"
      author = "Florian Roth"
      reference = "https://steemit.com/shadowbrokers/@theshadowbrokers/lost-in-translation"
      date = "2017-04-15"
      hash1 = "4cce9e39c376f67c16df3bcd69efd9b7472c3b478e2e5ef347e1410f1105c38d"
   strings:
      $x1 = "[+] Shellcode Callback %s:%d" fullword ascii
      $x2 = "[+] Exploiting Target" fullword ascii
   condition:
      ( uint16(0) == 0x5a4d and filesize < 150KB and 1 of them )
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 2 string patterns in its detection logic.

References

False Positive Guidance

Original source: https://github.com/Yara-Rules/rules/blob/main/malware/APT_eqgrp_apr17.yar