back2root/log4shell-rexCorrispondenza RegEx PCRE per Log4Shell CVE-2021-44228 IOC nei tuoi log
La seguente espressione regolare è stata scritta nel tentativo di individuare gli indicatori di uno sfruttamento di Log4Shell (CVE-2021-44228 e CVE-2021-45046).
Se esegui una versione precedente al 21/12/2021, è fortemente consigliato testare e aggiornare.
Ho rimosso alcune stranezze e migliorato le prestazioni.
L'espressione regolare mira ad essere compatibile con PCRE, ma dovrebbe funzionare anche su re2 e potenzialmente su altri motori di espressioni regolari.
Espressione Regolare:```regex (?im)(?:^|[\n]).?(?:[\x24]|%(?:25%?)24|\u?0(?:44|24))(?:[\x7b]|%(?:25%?)7b|\u?0(?:7b|173))[^\n]?((?:j|%(?:25%?)(?:4a|6a)|\u?0(?:112|6a|4a|152))[^\n]?(?:n|%(?:25%?)(?:4e|6e)|\u?0*(?:4e|156|116|6e))[^\n]?(?:d|%(?:25%?)(?:44|64)|\u?0*(?:44|144|104|64))[^\n]?(?:[i\x{130}\x{131}]|%(?:25%?)(?:49|69|C4%(?:25%?)B0|C4%(?:25%?)B1)|\u?0(?:111|69|49|151|130|460|131|461))[^\n]?(?:[\x3a]|%(?:25%?)3a|\u?0(?:72|3a))[^\n]?((?:l|%(?:25%?)(?:4c|6c)|\u?0*(?:154|114|6c|4c))[^\n]?(?:d|%(?:25%?)(?:44|64)|\u?0*(?:44|144|104|64))[^\n]?(?:a|%(?:25%?)(?:41|61)|\u?0*(?:101|61|41|141))[^\n]?(?:p|%(?:25%?)(?:50|70)|\u?0*(?:70|50|160|120))(?:[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\u?0(?:17f|123|577|73|53|163)))?|(?:r|%(?:25%?)(?:52|72)|\u?0(?:122|72|52|162))[^\n]?(?:m|%(?:25%?)(?:4d|6d)|\u?0*(?:4d|155|115|6d))[^\n]?(?:[i\x{130}\x{131}]|%(?:25%?)(?:49|69|C4%(?:25%?)B0|C4%(?:25%?)B1)|\u?0(?:111|69|49|151|130|460|131|461))|(?:d|%(?:25%?)(?:44|64)|\u?0*(?:44|144|104|64))[^\n]?(?:n|%(?:25%?)(?:4e|6e)|\u?0*(?:4e|156|116|6e))[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\u?0(?:17f|123|577|73|53|163))|(?:n|%(?:25%?)(?:4e|6e)|\u?0(?:4e|156|116|6e))[^\n]?(?:[i\x{130}\x{131}]|%(?:25%?)(?:49|69|C4%(?:25%?)B0|C4%(?:25%?)B1)|\u?0(?:111|69|49|151|130|460|131|461))[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\u?0(?:17f|123|577|73|53|163))|(?:[^\n]?(?:[i\x{130}\x{131}]|%(?:25%?)(?:49|69|C4%(?:25%?)B0|C4%(?:25%?)B1)|\u?0(?:111|69|49|151|130|460|131|461))){2}[^\n]?(?:o|%(?:25%?)(?:4f|6f)|\u?0*(?:6f|4f|157|117))[^\n]?(?:p|%(?:25%?)(?:50|70)|\u?0*(?:70|50|160|120))|(?:c|%(?:25%?)(?:43|63)|\u?0(?:143|103|63|43))[^\n]?(?:o|%(?:25%?)(?:4f|6f)|\u?0*(?:6f|4f|157|117))[^\n]?(?:r|%(?:25%?)(?:52|72)|\u?0*(?:122|72|52|162))[^\n]?(?:b|%(?:25%?)(?:42|62)|\u?0*(?:102|62|42|142))[^\n]?(?:a|%(?:25%?)(?:41|61)|\u?0*(?:101|61|41|141))|(?:n|%(?:25%?)(?:4e|6e)|\u?0(?:4e|156|116|6e))[^\n]?(?:d|%(?:25%?)(?:44|64)|\u?0*(?:44|144|104|64))[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\u?0(?:17f|123|577|73|53|163))|(?:h|%(?:25%?)(?:48|68)|\u?0(?:110|68|48|150))(?:[^\n]?(?:t|%(?:25%?)(?:54|74)|\u?0*(?:124|74|54|164))){2}[^\n]?(?:p|%(?:25%?)(?:50|70)|\u?0*(?:70|50|160|120))(?:[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\u?0(?:17f|123|577|73|53|163)))?)[^\n]?(?:[\x3a]|%(?:25%?)3a|\u?0(?:72|3a))|(?:b|%(?:25%?)(?:42|62)|\u?0*(?:102|62|42|142))[^\n]?(?:a|%(?:25%?)(?:41|61)|\u?0*(?:101|61|41|141))[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\u?0(?:17f|123|577|73|53|163))[^\n]?(?:e|%(?:25%?)(?:45|65)|\u?0*(?:45|145|105|65))[^\n]*?(?:[\x3a]|%(?:25%?)3a|\u?0(?:72|3a))(JH[s-v]|[\x2b\x2f-9A-Za-z][CSiy]R7|[\x2b\x2f-9A-Za-z]{2}[048AEIMQUYcgkosw]ke[\x2b\x2f-9w-z]))
## Capacità
A questo punto, questa regex dovrebbe corrispondere all'exploit, indipendentemente da:
- Appena registrato
- Maiuscole/minuscole (anche in tutte le codifiche supportate)
- Codifica URL
- Codifica URL ricorsiva
- Codifica Unicode
- Codifica Ottale
- Codifica Base64 (rudimentale)
### Contesto
L'obiettivo è avere una RegEx che rappresenti un compromesso ragionevole tra il rilevamento del maggior numero possibile di tentativi di attacco con un numero accettabile di falsi positivi.
L'attaccante APT troverà un modo per aggirarla se necessario, ma gli attacchi meno elaborati lasceranno la spia accesa.
Perché una (singola) RegEx: Perché può essere facilmente eseguita sulla CLI o in un SIEM senza strumenti aggiuntivi. Se si possono eseguire strumenti, fallo, esistono.
La lunghezza della regex è meno problematica delle sue prestazioni. Nonostante la lunghezza, la RegEx dovrebbe essere eseguibile in modo accettabilmente veloce sui dati di log medi.
### Invito all'azione
Voglio rendere difficile nascondere un attacco in scenari del mondo reale.
Se questa RegEx non corrisponde a qualcosa che hai visto in natura o che puoi dimostrare essere sfruttabile, per favore apri una issue.
È noto che è possibile aggirare facilmente la RegEx codificando diverse parti del pattern di attacco usando Base64. Tuttavia, questo è accettato, poiché `base64` non è ancora stato incluso in una versione ufficiale di Log4j. ([LOG4J2-2446](https://issues.apache.org/jira/projects/LOG4J2/issues/LOG4J2-2446))
### Strumenti
- Testa la RegEx: **[regex101](https://regex101.com/r/KqGG3W/24)**
- Visualizza la Regex: **[REGEXPER](https://regexper.com/#%28%3F%3A%5E%7C%5B%5Cn%5D%29.*%3F%28%3F%3A%5B%5Cx24%5D%7C%25%28%3F%3A25%25%3F%29*24%7C%5C%5Cu%3F0*%28%3F%3A44%7C24%29%29%28%3F%3A%5B%5Cx7b%5D%7C%25%28%3F%3A25%25%3F%29*7b%7C%5C%5Cu%3F0*%28%3F%3A7b%7C173%29%29%5B%5E%5Cn%5D*%3F%28%28%3F%3Aj%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A4a%7C6a%29%7C%5C%5Cu%3F0*%28%3F%3A112%7C6a%7C4a%7C152%29%29%5B%5E%5Cn%5D*%3F%28%3F%3An%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A4e%7C6e%29%7C%5C%5Cu%3F0*%28%3F%3A4e%7C156%7C116%7C6e%29%29%5B%5E%5Cn%5D*%3F%28%3F%3Ad%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A44%7C64%29%7C%5C%5Cu%3F0*%28%3F%3A44%7C144%7C104%7C64%29%29%5B%5E%5Cn%5D*%3F%28%3F%3A%5Bi%5Cx%7B130%7D%5Cx%7B131%7D%5D%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A49%7C69%7CC4%25%28%3F%3A25%25%3F%29*B0%7CC4%25%28%3F%3A25%25%3F%29*B1%29%7C%5C%5Cu%3F0*%28%3F%3A111%7C69%7C49%7C151%7C130%7C460%7C131%7C461%29%29%5B%5E%5Cn%5D*%3F%28%3F%3A%5B%5Cx3a%5D%7C%25%28%3F%3A25%25%3F%29*3a%7C%5C%5Cu%3F0*%28%3F%3A72%7C3a%29%29%5B%5E%5Cn%5D*%3F%28%28%3F%3Al%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A4c%7C6c%29%7C%5C%5Cu%3F0*%28%3F%3A154%7C114%7C6c%7C4c%29%29%5B%5E%5Cn%5D*%3F%28%3F%3Ad%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A44%7C64%29%7C%5C%5Cu%3F0*%28%3F%3A44%7C144%7C104%7C64%29%29%5B%5E%5Cn%5D*%3F%28%3F%3Aa%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A41%7C61%29%7C%5C%5Cu%3F0*%28%3F%3A101%7C61%7C41%7C141%29%29%5B%5E%5Cn%5D*%3F%28%3F%3Ap%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A50%7C70%29%7C%5C%5Cu%3F0*%28%3F%3A70%7C50%7C160%7C120%29%29%28%3F%3A%5B%5E%5Cn%5D*%3F%28%3F%3A%5Bs%5Cx%7B17f%7D%5D%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A53%7C73%7CC5%25%28%3F%3A25%25%3F%29*BF%29%7C%5C%5Cu%3F0*%28%3F%3A17f%7C123%7C577%7C73%7C53%7C163%29%29%29%3F%7C%28%3F%3Ar%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A52%7C72%29%7C%5C%5Cu%3F0*%28%3F%3A122%7C72%7C52%7C162%29%29%5B%5E%5Cn%5D*%3F%28%3F%3Am%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A4d%7C6d%29%7C%5C%5Cu%3F0*%28%3F%3A4d%7C155%7C115%7C6d%29%29%5B%5E%5Cn%5D*%3F%28%3F%3A%5Bi%5Cx%7B130%7D%5Cx%7B131%7D%5D%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A49%7C69%7CC4%25%28%3F%3A25%25%3F%29*B0%7CC4%25%28%3F%3A25%25%3F%29*B1%29%7C%5C%5Cu%3F0*%28%3F%3A111%7C69%7C49%7C151%7C130%7C460%7C131%7C461%29%29%7C%28%3F%3Ad%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A44%7C64%29%7C%5C%5Cu%3F0*%28%3F%3A44%7C144%7C104%7C64%29%29%5B%5E%5Cn%5D*%3F%28%3F%3An%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A4e%7C6e%29%7C%5C%5Cu%3F0*%28%3F%3A4e%7C156%7C116%7C6e%29%29%5B%5E%5Cn%5D*%3F%28%3F%3A%5Bs%5Cx%7B17f%7D%5D%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A53%7C73%7CC5%25%28%3F%3A25%25%3F%29*BF%29%7C%5C%5Cu%3F0*%28%3F%3A17f%7C123%7C577%7C73%7C53%7C163%29%29%7C%28%3F%3An%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A4e%7C6e%29%7C%5C%5Cu%3F0*%28%3F%3A4e%7C156%7C116%7C6e%29%29%5B%5E%5Cn%5D*%3F%28%3F%3A%5Bi%5Cx%7B130%7D%5Cx%7B131%7D%5D%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A49%7C69%7CC4%25%28%3F%3A25%25%3F%29*B0%7CC4%25%28%3F%3A25%25%3F%29*B1%29%7C%5C%5Cu%3F0*%28%3F%3A111%7C69%7C49%7C151%7C130%7C460%7C131%7C461%29%29%5B%5E%5Cn%5D*%3F%28%3F%3A%5Bs%5Cx%7B17f%7D%5D%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A53%7C73%7CC5%25%28%3F%3A25%25%3F%29*BF%29%7C%5C%5Cu%3F0*%28%3F%3A17f%7C123%7C577%7C73%7C53%7C163%29%29%7C%28%3F%3A%5B%5E%5Cn%5D*%3F%28%3F%3A%5Bi%5Cx%7B130%7D%5Cx%7B131%7D%5D%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A49%7C69%7CC4%25%28%3F%3A25%25%3F%29*B0%7CC4%25%28%3F%3A25%25%3F%29*B1%29%7C%5C%5Cu%3F0*%28%3F%3A111%7C69%7C49%7C151%7C130%7C460%7C131%7C461%29%29%29%7B2%7D%5B%5E%5Cn%5D*%3F%28%3F%3Ao%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A4f%7C6f%29%7C%5C%5Cu%3F0*%28%3F%3A6f%7C4f%7C157%7C117%29%29%5B%5E%5Cn%5D*%3F%28%3F%3Ap%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A50%7C70%29%7C%5C%5Cu%3F0*%28%3F%3A70%7C50%7C160%7C120%29%29%7C%28%3F%3Ac%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A43%7C63%29%7C%5C%5Cu%3F0*%28%3F%3A143%7C103%7C63%7C43%29%29%5B%5E%5Cn%5D*%3F%28%3F%3Ao%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A4f%7C6f%29%7C%5C%5Cu%3F0*%28%3F%3A6f%7C4f%7C157%7C117%29%29%5B%5E%5Cn%5D*%3F%28%3F%3Ar%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A52%7C72%29%7C%5C%5Cu%3F0*%28%3F%3A122%7C72%7C52%7C162%29%29%5B%5E%5Cn%5D*%3F%28%3F%3Ab%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A42%7C62%29%7C%5C%5Cu%3F0*%28%3F%3A102%7C62%7C42%7C142%29%29%5B%5E%5Cn%5D*%3F%28%3F%3Aa%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A41%7C61%29%7C%5C%5Cu%3F0*%28%3F%3A101%7C61%7C41%7C141%29%29%7C%28%3F%3An%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A4e%7C6e%29%7C%5C%5Cu%3F0*%28%3F%3A4e%7C156%7C116%7C6e%29%29%5B%5E%5Cn%5D*%3F%28%3F%3Ad%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A44%7C64%29%7C%5C%5Cu%3F0*%28%3F%3A44%7C144%7C104%7C64%29%29%5B%5E%5Cn%5D*%3F%28%3F%3A%5Bs%5Cx%7B17f%7D%5D%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A53%7C73%7CC5%25%28%3F%3A25%25%3F%29*BF%29%7C%5C%5Cu%3F0*%28%3F%3A17f%7C123%7C577%7C73%7C53%7C163%29%29%7C%28%3F%3Ah%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A48%7C68%29%7C%5C%5Cu%3F0*%28%3F%3A110%7C68%7C48%7C150%29%29%28%3F%3A%5B%5E%5Cn%5D*%3F%28%3F%3At%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A54%7C74%29%7C%5C%5Cu%3F0*%28%3F%3A124%7C74%7C54%7C164%29%29%29%7B2%7D%5B%5E%5Cn%5D*%3F%28%3F%3Ap%7C%25%28%3F%3A25%25%3F%29*%28%3F%3A50%7C70%29%7C%5C%5Cu%3F0*%28%3F%3A70%7C50%7C160%7C120%29%29%28%3F%3A%5B%5E%5Cn%5D*%3F%28%3F%3A%5Bs%5Cx%7B17f%7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## Caccia sulla tua macchina Linux
### Sulla CLI con `grep````bash
eval "$(./RegEx_Generator.sh)"
grep -P ${Log4ShellRex} <logfile>
require('dotenv').config();
const fs = require('fs');
const pg = require('pg');```bash
grep -P '(?im)(?:^|[\n]).?(?:[\x24]|%(?:25%?)24|\u?0(?:44|24))(?:[\x7b]|%(?:25%?)7b|\u?0(?:7b|173))[^\n]?((?:j|%(?:25%?)(?:4a|6a)|\u?0(?:112|6a|4a|152))[^\n]?(?:n|%(?:25%?)(?:4e|6e)|\u?0*(?:4e|156|116|6e))[^\n]?(?:d|%(?:25%?)(?:44|64)|\u?0*(?:44|144|104|64))[^\n]?(?:[i\x{130}\x{131}]|%(?:25%?)(?:49|69|C4%(?:25%?)B0|C4%(?:25%?)B1)|\u?0(?:111|69|49|151|130|460|131|461))[^\n]?(?:[\x3a]|%(?:25%?)3a|\u?0(?:72|3a))[^\n]?((?:l|%(?:25%?)(?:4c|6c)|\u?0*(?:154|114|6c|4c))[^\n]?(?:d|%(?:25%?)(?:44|64)|\u?0*(?:44|144|104|64))[^\n]?(?:a|%(?:25%?)(?:41|61)|\u?0*(?:101|61|41|141))[^\n]?(?:p|%(?:25%?)(?:50|70)|\u?0*(?:70|50|160|120))(?:[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\u?0(?:17f|123|577|73|53|163)))?|(?:r|%(?:25%?)(?:52|72)|\u?0(?:122|72|52|162))[^\n]?(?:m|%(?:25%?)(?:4d|6d)|\u?0*(?:4d|155|115|6d))[^\n]?(?:[i\x{130}\x{131}]|%(?:25%?)(?:49|69|C4%(?:25%?)B0|C4%(?:25%?)B1)|\u?0(?:111|69|49|151|130|460|131|461))|(?:d|%(?:25%?)(?:44|64)|\u?0*(?:44|144|104|64))[^\n]?(?:n|%(?:25%?)(?:4e|6e)|\u?0*(?:4e|156|116|6e))[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\u?0(?:17f|123|577|73|53|163))|(?:n|%(?:25%?)(?:4e|6e)|\u?0(?:4e|156|116|6e))[^\n]?(?:[i\x{130}\x{131}]|%(?:25%?)(?:49|69|C4%(?:25%?)B0|C4%(?:25%?)B1)|\u?0(?:111|69|49|151|130|460|131|461))[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\u?0(?:17f|123|577|73|53|163))|(?:[^\n]?(?:[i\x{130}\x{131}]|%(?:25%?)(?:49|69|C4%(?:25%?)B0|C4%(?:25%?)B1)|\u?0(?:111|69|49|151|130|460|131|461))){2}[^\n]?(?:o|%(?:25%?)(?:4f|6f)|\u?0*(?:6f|4f|157|117))[^\n]?(?:p|%(?:25%?)(?:50|70)|\u?0*(?:70|50|160|120))|(?:c|%(?:25%?)(?:43|63)|\u?0(?:143|103|63|43))[^\n]?(?:o|%(?:25%?)(?:4f|6f)|\u?0*(?:6f|4f|157|117))[^\n]?(?:r|%(?:25%?)(?:52|72)|\u?0*(?:122|72|52|162))[^\n]?(?:b|%(?:25%?)(?:42|62)|\u?0*(?:102|62|42|142))[^\n]?(?:a|%(?:25%?)(?:41|61)|\u?0*(?:101|61|41|141))|(?:n|%(?:25%?)(?:4e|6e)|\u?0(?:4e|156|116|6e))[^\n]?(?:d|%(?:25%?)(?:44|64)|\u?0*(?:44|144|104|64))[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\u?0(?:17f|123|577|73|53|163))|(?:h|%(?:25%?)(?:48|68)|\u?0(?:110|68|48|150))(?:[^\n]?(?:t|%(?:25%?)(?:54|74)|\u?0*(?:124|74|54|164))){2}[^\n]?(?:p|%(?:25%?)(?:50|70)|\u?0*(?:70|50|160|120))(?:[^\n](?:53|73|C5%(?:25%?)(?:17f|123|577|73|53|163)))?)[^\n](?:42|62)|\u?0*(?:102|62|42|142))[^\n](?:41|61)|\u?0*(?:101|61|41|141))[^\n](?:53|73|C5%(?:25%?)(?:17f|123|577|73|53|163))[^\n](?:45|65)|\u?0*(?:45|145|105|65))[^\n]*?(?:[\x3a]|%(?:25%?)(?:72|3a))(JH[s-v]|[\x2b\x2f-9A-Za-z][CSiy]R7|[\x2b\x2f-9A-Za-z]{2}[048AEIMQUYcgkosw]ke[\x2b\x2f-9w-z]))'
### Combinalo con `find` per scansionare ricorsivamente una (sotto-)cartella di file di log```bash
eval "$(./RegEx_Generator.sh)"
find /var/log -name "*.log" | xargs grep -P ${Log4ShellRex}
repositories:
- url: https://your-private-git-server.invalid/owner/repo.git
branch: main
# cairosign:
# key: /path/to/private-key.pem
# cert: /path/to/cert.pem
# password: m5F3r!P@ssw0rd
Questo progetto utilizza Pants come sistema di build, in particolare il backend [python-sources](..). Il file pants.toml nella root lo configura.
---```bash find /var/log -name ".log" | xargs grep -P '(?im)(?:^|[\n]).?(?:[\x24]|%(?:25%?)24|\u?0(?:44|24))(?:[\x7b]|%(?:25%?)7b|\u?0(?:7b|173))[^\n]?((?:j|%(?:25%?)(?:4a|6a)|\u?0*(?:112|6a|4a|152))[^\n]?(?:n|%(?:25%?)(?:4e|6e)|\u?0*(?:4e|156|116|6e))[^\n]?(?:d|%(?:25%?)(?:44|64)|\u?0*(?:44|144|104|64))[^\n]?(?:[i\x{130}\x{131}]|%(?:25%?)(?:49|69|C4%(?:25%?)B0|C4%(?:25%?)B1)|\u?0(?:111|69|49|151|130|460|131|461))[^\n]?(?:[\x3a]|%(?:25%?)3a|\u?0(?:72|3a))[^\n]?((?:l|%(?:25%?)(?:4c|6c)|\u?0*(?:154|114|6c|4c))[^\n]?(?:d|%(?:25%?)(?:44|64)|\u?0*(?:44|144|104|64))[^\n]?(?:a|%(?:25%?)(?:41|61)|\u?0*(?:101|61|41|141))[^\n]?(?:p|%(?:25%?)(?:50|70)|\u?0*(?:70|50|160|120))(?:[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\u?0(?:17f|123|577|73|53|163)))?|(?:r|%(?:25%?)(?:52|72)|\u?0(?:122|72|52|162))[^\n]?(?:m|%(?:25%?)(?:4d|6d)|\u?0*(?:4d|155|115|6d))[^\n]?(?:[i\x{130}\x{131}]|%(?:25%?)(?:49|69|C4%(?:25%?)B0|C4%(?:25%?)B1)|\u?0(?:111|69|49|151|130|460|131|461))|(?:d|%(?:25%?)(?:44|64)|\u?0*(?:44|144|104|64))[^\n]?(?:n|%(?:25%?)(?:4e|6e)|\u?0*(?:4e|156|116|6e))[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\u?0(?:17f|123|577|73|53|163))|(?:n|%(?:25%?)(?:4e|6e)|\u?0(?:4e|156|116|6e))[^\n]?(?:[i\x{130}\x{131}]|%(?:25%?)(?:49|69|C4%(?:25%?)B0|C4%(?:25%?)B1)|\u?0(?:111|69|49|151|130|460|131|461))[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\u?0(?:17f|123|577|73|53|163))|(?:[^\n]?(?:[i\x{130}\x{131}]|%(?:25%?)(?:49|69|C4%(?:25%?)B0|C4%(?:25%?)B1)|\u?0(?:111|69|49|151|130|460|131|461))){2}[^\n]?(?:o|%(?:25%?)(?:4f|6f)|\u?0*(?:6f|4f|157|117))[^\n]?(?:p|%(?:25%?)(?:50|70)|\u?0*(?:70|50|160|120))|(?:c|%(?:25%?)(?:43|63)|\u?0(?:143|103|63|43))[^\n]?(?:o|%(?:25%?)(?:4f|6f)|\u?0*(?:6f|4f|157|117))[^\n]?(?:r|%(?:25%?)(?:52|72)|\u?0*(?:122|72|52|162))[^\n]?(?:b|%(?:25%?)(?:42|62)|\u?0*(?:102|62|42|142))[^\n]?(?:a|%(?:25%?)(?:41|61)|\u?0*(?:101|61|41|141))|(?:n|%(?:25%?)(?:4e|6e)|\u?0(?:4e|156|116|6e))[^\n]?(?:d|%(?:25%?)(?:44|64)|\u?0*(?:44|144|104|64))[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\u?0(?:17f|123|577|73|53|163))|(?:h|%(?:25%?)(?:48|68)|\u?0(?:110|68|48|150))(?:[^\n]?(?:t|%(?:25%?)(?:54|74)|\u?0*(?:124|74|54|164))){2}[^\n](?:50|70)|\u?0*(?:70|50|160|120))(?:[^\n](?:53|73|C5%(?:25%?)(?:17f|123|577|73|53|163)))?)[^\n](?:42|62)|\u?0*(?:102|62|42|142))[^\n](?:41|61)|\u?0*(?:101|61|41|141))[^\n](?:53|73|C5%(?:25%?)(?:17f|123|577|73|53|163))[^\n](?:45|65)|\u?0*(?:45|145|105|65))[^\n]*?(?:[\x3a]|%(?:25%?)(?:72|3a))(JH[s-v]|[\x2b\x2f-9A-Za-z][CSiy]R7|[\x2b\x2f-9A-Za-z]{2}[048AEIMQUYcgkosw]ke[\x2b\x2f-9w-z]))'
## Caccia nei tuoi log usando Splunk
Puoi usare questa regex per cercare nei tuoi log indicizzati usando il comando `| regex`
[SPL](https://docs.splunk.com/Documentation/Splunk/latest/SearchReference/Regex) comando```spl
index=<...> sourcetype=<...>
| regex "<Log4ShellRex>"
I'm ready to translate the provided content. I see that the input field is empty. Please provide the Markdown content for chunk 13/15 so I can proceed with the translation.```spl index=<...> sourcetype=<...> | regex "(?im)(?:^|[\n]).?(?:[\x24]|%(?:25%?)24|\\u?0(?:44|24))(?:[\x7b]|%(?:25%?)7b|\\u?0(?:7b|173))[^\n]?((?:j|%(?:25%?)(?:4a|6a)|\\u?0(?:112|6a|4a|152))[^\n]?(?:n|%(?:25%?)(?:4e|6e)|\\u?0*(?:4e|156|116|6e))[^\n]?(?:d|%(?:25%?)(?:44|64)|\\u?0*(?:44|144|104|64))[^\n]?(?:[i\x{130}\x{131}]|%(?:25%?)(?:49|69|C4%(?:25%?)B0|C4%(?:25%?)B1)|\\u?0(?:111|69|49|151|130|460|131|461))[^\n]?(?:[\x3a]|%(?:25%?)3a|\\u?0(?:72|3a))[^\n]?((?:l|%(?:25%?)(?:4c|6c)|\\u?0*(?:154|114|6c|4c))[^\n]?(?:d|%(?:25%?)(?:44|64)|\\u?0*(?:44|144|104|64))[^\n]?(?:a|%(?:25%?)(?:41|61)|\\u?0*(?:101|61|41|141))[^\n]?(?:p|%(?:25%?)(?:50|70)|\\u?0*(?:70|50|160|120))(?:[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\\u?0(?:17f|123|577|73|53|163)))?|(?:r|%(?:25%?)(?:52|72)|\\u?0(?:122|72|52|162))[^\n]?(?:m|%(?:25%?)(?:4d|6d)|\\u?0*(?:4d|155|115|6d))[^\n]?(?:[i\x{130}\x{131}]|%(?:25%?)(?:49|69|C4%(?:25%?)B0|C4%(?:25%?)B1)|\\u?0(?:111|69|49|151|130|460|131|461))|(?:d|%(?:25%?)(?:44|64)|\\u?0*(?:44|144|104|64))[^\n]?(?:n|%(?:25%?)(?:4e|6e)|\\u?0*(?:4e|156|116|6e))[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\\u?0(?:17f|123|577|73|53|163))|(?:n|%(?:25%?)(?:4e|6e)|\\u?0(?:4e|156|116|6e))[^\n]?(?:[i\x{130}\x{131}]|%(?:25%?)(?:49|69|C4%(?:25%?)B0|C4%(?:25%?)B1)|\\u?0(?:111|69|49|151|130|460|131|461))[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\\u?0(?:17f|123|577|73|53|163))|(?:[^\n]?(?:[i\x{130}\x{131}]|%(?:25%?)(?:49|69|C4%(?:25%?)B0|C4%(?:25%?)B1)|\\u?0(?:111|69|49|151|130|460|131|461))){2}[^\n]?(?:o|%(?:25%?)(?:4f|6f)|\\u?0*(?:6f|4f|157|117))[^\n]?(?:p|%(?:25%?)(?:50|70)|\\u?0*(?:70|50|160|120))|(?:c|%(?:25%?)(?:43|63)|\\u?0(?:143|103|63|43))[^\n]?(?:o|%(?:25%?)(?:4f|6f)|\\u?0*(?:6f|4f|157|117))[^\n]?(?:r|%(?:25%?)(?:52|72)|\\u?0*(?:122|72|52|162))[^\n]?(?:b|%(?:25%?)(?:42|62)|\\u?0*(?:102|62|42|142))[^\n]?(?:a|%(?:25%?)(?:41|61)|\\u?0*(?:101|61|41|141))|(?:n|%(?:25%?)(?:4e|6e)|\\u?0(?:4e|156|116|6e))[^\n]?(?:d|%(?:25%?)(?:44|64)|\\u?0*(?:44|144|104|64))[^\n]?(?:[s\x{17f}]|%(?:25%?)(?:53|73|C5%(?:25%?)BF)|\\u?0(?:17f|123|577|73|53|163))|(?:h|%(?:25%?)(?:110|68|48|150))(?:[^\n](?:54|74)|\\u?0*(?:124|74|54|164))){2}[^\n](?:50|70)|\\u?0*(?:70|50|160|120))(?:[^\n](?:53|73|C5%(?:25%?)(?:17f|123|577|73|53|163)))?)[^\n](?:42|62)|\\u?0*(?:102|62|42|142))[^\n](?:41|61)|\\u?0*(?:101|61|41|141))[^\n](?:53|73|C5%(?:25%?)(?:17f|123|577|73|53|163))[^\n](?:45|65)|\\u?0*(?:45|145|105|65))[^\n]*?(?:[\x3a]|%(?:25%?)(?:72|3a))(JH[s-v]|[\x2b\x2f-9A-Za-z][CSiy]R7|[\x2b\x2f-9A-Za-z]{2}[048AEIMQUYcgkosw]ke[\x2b\x2f-9w-z]))"
## Schermata
**regex101**
**grep -P**
**Splunk**
**Rappresentazione grafica della RegEx**
(Creata con lo strumento regexper di Jeff Avallone, concesso in licenza sotto
[CC BY license](https://creativecommons.org/licenses/by/3.0/).)
## Altro
**Per favore, crea una pull request / issue se puoi fornire sintassi per altri sistemi.**
## Crediti
Ho ricevuto aiuto e idee da:
- [@cyberops](https://twitter.com/cyb3rops) che ha creato [log4shell-detector](https://github.com/Neo23x0/log4shell-detector/) che mi è servito da ispirazione
- [@karanlyons](https://github.com/karanlyons) che ha fornito il corpus da testare