Linux binary(s) ftp shell evasion threat (#2007)

Co-authored-by: Colson Wilhoit <48036388+DefSecSentinel@users.noreply.github.com>

rules/linux/execution_shell_evasion_linux_binary.toml

@@ -91,6 +91,7 @@ references = [
     "https://gtfobins.github.io/gtfobins/capsh/",
     "https://gtfobins.github.io/gtfobins/byebug/",
     "https://gtfobins.github.io/gtfobins/git/",
+    "https://gtfobins.github.io/gtfobins/ftp/"
 ]
 risk_score = 47
 rule_id = "52376a86-ee86-4967-97ae-1a05f55816f0"
@@ -107,7 +108,7 @@ process where event.type == "start" and
 
   /* launching shells from unusual parents or parent+arg combos */
   (process.name in ("bash", "sh", "dash","ash") and
-    (process.parent.name in ("byebug","git")) or
+    (process.parent.name in ("byebug","git","ftp")) or
 
     /* shells specified in parent args */
     /* nice rule is broken in 8.2 */