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Equation Group hack tool leaked by ShadowBrokers- file ys.auto

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: 2026-06-07T23:00:00Z · Confidence: medium

Hunt Hypothesis

The detection identifies potential adversary use of the leaked Equation Group tool ys.auto, which may indicate advanced persistent threat activity. SOC teams should proactively hunt for this behavior in Azure Sentinel to identify and mitigate early-stage compromise by sophisticated adversaries leveraging leaked malware.

YARA Rule

rule EquationGroup_ys {
   meta:
      description = "Equation Group hack tool leaked by ShadowBrokers- file ys.auto"
      author = "Florian Roth"
      reference = "https://medium.com/@shadowbrokerss/dont-forget-your-base-867d304a94b1"
      date = "2017-04-08"
      hash1 = "a6387307d64778f8d9cfc60382fdcf0627cde886e952b8d73cc61755ed9fde15"
   strings:
      $x1 = "EXPLOIT_SCRIPME=\"$EXPLOIT_SCRIPME\"" fullword ascii
      $x3 = "DEFTARGET=`head /current/etc/opscript.txt 2>/dev/null | grepip 2>/dev/null | head -1`" fullword ascii
      $x4 = "FATAL ERROR: -x port and -n port MUST NOT BE THE SAME." fullword ascii
   condition:
      filesize < 250KB 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