From 36e5821213fe56de6e8a196b40bf8fb46f0264f7 Mon Sep 17 00:00:00 2001
From: twesterhever <40121680+twesterhever@users.noreply.github.com>
Date: Fri, 2 Jun 2023 10:19:30 +0000
Subject: [PATCH] [Rules] Add thread hijacking composite rule

---
 conf/composites.conf | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/conf/composites.conf b/conf/composites.conf
index 19a2187e6..7fe417668 100644
--- a/conf/composites.conf
+++ b/conf/composites.conf
@@ -160,6 +160,13 @@ composites {
     policy = "leave";
     description = "Message only contains a redirector URL";
   }
+  THREAD_HIJACKING_FROM_INJECTOR {
+    expression = "FAKE_REPLY & RCVD_VIA_SMTP_AUTH & (!RECEIVED_SPAMHAUS_PBL | RECEIVED_SPAMHAUS_XBL | RECEIVED_SPAMHAUS_SBL)";
+    score = 2.0;
+    policy = "leave";
+    description = "Fake reply exhibiting characteristics of being injected into a compromised mail server, possibly e-mail thread hijacking";
+    group = "compromised_hosts";
+  }
 
   .include(try=true; priority=1; duplicate=merge) "$LOCAL_CONFDIR/local.d/composites.conf"
   .include(try=true; priority=10) "$LOCAL_CONFDIR/override.d/composites.conf"
-- 
2.39.5