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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: 2026-06-09T11:00:00Z · Confidence: medium

Hunt Hypothesis

The hypothesis is that the detection of EquationGroup Tool - April Leak indicates potential adversary activity leveraging a known malware variant associated with advanced persistent threats. A SOC team should proactively hunt for this behavior in Azure Sentinel to identify and mitigate potential compromise from sophisticated adversaries exploiting legacy or dormant malware.

YARA Rule

rule EquationGroup_Toolset_Apr17_Regread_1_1_1 {
   meta:
      description = "Detects EquationGroup Tool - April Leak"
      author = "Florian Roth"
      reference = "https://steemit.com/shadowbrokers/@theshadowbrokers/lost-in-translation"
      date = "2017-04-15"
      hash1 = "722f034ba634f45c429c7dafdbff413c08976b069a6b30ec91bfa5ce2e4cda26"
   strings:
      $s1 = "[+] Connected to the Registry Service" fullword ascii
      $s2 = "f08d49ac41d1023d9d462d58af51414daff95a6a" fullword ascii
   condition:
      ( uint16(0) == 0x5a4d and filesize < 80KB 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