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Updated WAF_log4j_vulnerability.yaml #3826

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Merged
aprakash13 merged 1 commit into from
Jan 4, 2022
Merged

Updated WAF_log4j_vulnerability.yaml #3826

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14 changes: 12 additions & 2 deletions Hunting Queries/AzureDiagnostics/WAF_log4j_vulnerability.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,17 @@ query: |
let log4jRegex = @'(\\$|%24)(\\{|%7B)([^jJ]*[jJ])([^nN]*[nN])([^dD]*[dD])([^iI]*[iI])(:|%3A|\\$|%24|}|%7D)';
AzureDiagnostics
| where Category in ("FrontdoorWebApplicationFirewallLog", "FrontdoorAccessLog", "ApplicationGatewayFirewallLog", "ApplicationGatewayAccessLog")
//The regex and the string matching look for the most common attacks. This is not supposed to be comprehensive.
//Extending the columns to aviod failures.
| extend originalRequestUriWithArgs_s = column_ifexists("originalRequestUriWithArgs_s", ""),
userAgent_s = column_ifexists("userAgent_s", ""),
clientIP_s = column_ifexists("clientIP_s", ""),
clientPort_d = column_ifexists("originalRequestUriWithArgs_s", ""),
host_s = column_ifexists("host_s", ""),
requestUri_s = column_ifexists("requestUri_s", ""),
httpStatus_d = column_ifexists("httpStatus_d",""),
listenerName_s = column_ifexists("listenerName_s", ""),
httpMethod_s = column_ifexists("httpMethod_s", "")
//The regex and the string matching look for the most common attacks. This is not supposed to be comprehensive.
| where originalRequestUriWithArgs_s has_any (log4jcmdstring) or originalRequestUriWithArgs_s matches regex log4jRegex or userAgent_s has_any (log4jcmdstring) or userAgent_s matches regex log4jRegex
| extend CmdLine = iff(originalRequestUriWithArgs_s has 'Base64/', split(split(originalRequestUriWithArgs_s, "Base64/",1)[0], "}", 0)[0], split(split(userAgent_s, "Base64/",1)[0], "}", 0)[0])
| extend CmdLine = base64_decode_tostring(tostring(CmdLine))
Expand All @@ -32,4 +42,4 @@ entityMappings:
fieldMappings:
- identifier: Address
columnName: IPCustomEntity
version: 1.0.1
version: 1.0.2