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chore: update rules wazuh

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Xor290
2026-05-08 21:37:45 +02:00
parent 2d67c451e5
commit f67168f55a
1 changed files with 76 additions and 0 deletions
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monitoring/wazuh/config/wazuh_manager/rules/local_ssh_pam_noise.xml
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<!-- ═══════════════════════════════════════════════════════════════════
Réduction du bruit SSH/PAM — overrides des règles natives Wazuh
═══════════════════════════════════════════════════════════════════
Supprimés (level 0) : événements sans valeur sécurité générés en masse
Conservés intacts : tout ce qui alimente l'active-response et la
détection de brute-force (5710, 5716, 5720, 5760, 5763…)
-->
<!-- ─── PAM ──────────────────────────────────────────────────────────── -->
<group name="pam,syslog,">
<!-- 5501 (level 3) → PAM "session opened" : redondant avec 5715 sshd auth success -->
<rule id="5501" level="0" overwrite="yes">
<if_sid>5500</if_sid>
<match>session opened for user </match>
<description>PAM: Login session opened (bruit supprimé).</description>
</rule>
<!-- 5502 (level 3) → PAM "session closed" : purement informatif -->
<rule id="5502" level="0" overwrite="yes">
<if_sid>5500</if_sid>
<match>session closed for user </match>
<description>PAM: Login session closed (bruit supprimé).</description>
</rule>
</group>
<!-- ─── SSH ──────────────────────────────────────────────────────────── -->
<group name="syslog,sshd,">
<!-- 5704 (level 4) → timeout individuel : la règle de fréquence 5705
(level 10) continue de compter et d'alerter sur les patterns -->
<rule id="5704" level="0" overwrite="yes">
<if_sid>5700</if_sid>
<match>fatal: Timeout before authentication for</match>
<description>sshd: Timeout individuel supprimé (fréquence 5705 active).</description>
</rule>
<!-- 5706 (level 6) → "Did not receive identification string" : scanners
qui touchent le port 22 sans finir le handshake, très fréquent -->
<rule id="5706" level="0" overwrite="yes">
<if_sid>5700</if_sid>
<match>Did not receive identification string from</match>
<description>sshd: Sonde sans identification (bruit de scan supprimé).</description>
</rule>
<!-- 5740 (level 4) → connection reset by peer : bruit réseau/bots -->
<rule id="5740" level="0" overwrite="yes">
<if_sid>5700</if_sid>
<match>Connection reset by peer$</match>
<description>sshd: Connection reset by peer (bruit supprimé).</description>
</rule>
<!-- 5741 (level 4) → connection refused : pas d'intérêt sur un agent -->
<rule id="5741" level="0" overwrite="yes">
<if_sid>5700</if_sid>
<match>Connection refused$</match>
<description>sshd: Connection refused (bruit supprimé).</description>
</rule>
<!-- 5749 (level 4) → bad packet length : scanners/bots -->
<rule id="5749" level="0" overwrite="yes">
<if_sid>5700</if_sid>
<match>^Bad packet length</match>
<description>sshd: Bad packet length (bruit de scan supprimé).</description>
</rule>
<!-- 5762 (level 4) → connection reset : doublon de 5740 -->
<rule id="5762" level="0" overwrite="yes">
<if_sid>5700</if_sid>
<match>Connection reset</match>
<description>sshd: Connection reset (bruit supprimé).</description>
</rule>
</group>