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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 the 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 early-stage compromise from sophisticated adversaries.

YARA Rule

rule EquationGroup_Toolset_Apr17_Easypi_Explodingcan {
   meta:
      description = "Detects EquationGroup Tool - April Leak"
      author = "Florian Roth"
      reference = "https://steemit.com/shadowbrokers/@theshadowbrokers/lost-in-translation"
      date = "2017-04-15"
      hash1 = "dc1ddad7e8801b5e37748ec40531a105ba359654ffe8bdb069bd29fb0b5afd94"
      hash2 = "97af543cf1fb59d21ba5ec6cb2f88c8c79c835f19c8f659057d2f58c321a0ad4"
   strings:
      $x1 = "[-] %s - Target might not be in a usable state." fullword ascii
      $x2 = "[*] Exploiting Target" fullword ascii
      $x3 = "[-] Encoding Exploit Payload failed!" fullword ascii
   condition:
      ( uint16(0) == 0x5a4d and filesize < 100KB and 1 of them )
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 3 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