← Back to SOC feed Coverage →

Detects EquationGroup Tool - April Leak

yara LOW Yara-Rules
community
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 use of legacy malware associated with advanced persistent threats. A SOC team should proactively hunt for this behavior in Azure Sentinel to identify and mitigate long-lived, stealthy threats that may have evaded traditional detection mechanisms.

YARA Rule

rule EquationGroup_Toolset_Apr17_Eclipsedwingtouch_1_0_4 {
   meta:
      description = "Detects EquationGroup Tool - April Leak"
      author = "Florian Roth"
      reference = "https://steemit.com/shadowbrokers/@theshadowbrokers/lost-in-translation"
      date = "2017-04-15"
      hash1 = "46da99d80fc3eae5d1d5ab2da02ed7e61416e1eafeb23f37b180c46e9eff8a1c"
   strings:
      $x1 = "[-] The target is NOT vulnerable" fullword ascii
      $x2 = "[+] The target IS VULNERABLE" fullword ascii
   condition:
      ( uint16(0) == 0x5a4d and filesize < 50KB 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