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ZeroAccess Exploit Kit Detection

yara LOW Yara-Rules
communityexploit
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: 2026-05-11T23:00:00Z · Confidence: medium

Hunt Hypothesis

The ZeroAccess Exploit Kit Detection rule identifies potential exploitation attempts by malicious actors leveraging compromised systems to deploy malware or establish command and control channels. SOC teams should proactively hunt for this behavior in Azure Sentinel to detect early-stage compromise and prevent the spread of advanced persistent threats within their environment.

YARA Rule

rule zeroaccess_js : EK js
{
meta:
   author = "Josh Berry"
   date = "2016-06-27"
   description = "ZeroAccess Exploit Kit Detection"
   hash0 = "a9f30483a197cfdc65b4a70b8eb738ab"
   sample_filetype = "js-html"
   yaragenerator = "https://github.com/Xen0ph0n/YaraGenerator"
strings:
   $string0 = "Square ad tag  (tile"
   $string1 = "  adRandNum "
   $string2 = " cellspacing"
   $string3 = "\\n//-->\\n</script>"
   $string4 = "format"
   $string5 = "//-->' "
   $string6 = "2287974446"
   $string7 = "NoScrBeg "
   $string8 = "-- start adblade -->' "
   $string9 = "3427054556"
   $string10 = "        while (i >"
   $string11 = "return '<table width"
   $string12 = "</scr' "
   $string13 = " s.substring(0, i"
   $string14 = " /></a></noscript>' "
   $string15 = "    else { isEmail "
   $string16 = ").submit();"
   $string17 = " border"
   $string18 = "pub-8301011321395982"
condition:
   18 of them
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 19 string patterns in its detection logic.

False Positive Guidance

Original source: https://github.com/Yara-Rules/rules/blob/main/exploit_kits/EK_ZeroAcces.yar