Merge pull request #246 from Tlinne2/patch-1

Create Email_quota_limit_warning

email/Email_quota_limit_warning

+/*
+    This Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and open to any user or 
+    organization, as long as you use it under this license.
+*/
+
+rule Email_quota_limit_warning : mail
+{
+  meta:
+		Author = "Tyler Linne <@InfoSecTyler>"
+		Description ="Rule to prevent against known email quota limit phishing campaign"
+    
+  strings:
+    $eml_01 = "From:" //Added eml context
+    $eml_02 = "To:"
+    $eml_03 = "Subject:"
+    $subject1={ 44 65 61 72 20 [0-11] 20 41 63 63 6f 75 6e 74 20 55 73 65 72 73 } // Range allows for different company names to be accepted
+    $hello1={ 44 65 61 72 20 [0-11] 20 41 63 63 6f 75 6e 74 20 55 73 65 72 73 }
+    $body1="You have exceded" nocase
+    $body2={65 2d 6d 61 69 6c 20 61 63 63 6f 75 6e 74 20 6c 69 6d 69 74 20 71 75 6f 74 61 20 6f 66 [0-4] } //Range allows for different quota "upgrade" sizes
+    $body3="requested to expand it within 24 hours" nocase
+    $body4="e-mail account will be disable from our database" nocase
+    $body5="simply click with the complete information" nocase
+    $body6="requested to expand your account quota" nocase
+    $body7={54 68 61 6e 6b 20 79 6f 75 20 66 6f 72 20 75 73 69 6e 67 20 [0-11] 20 57 65 62 6d 61 69 6c } // Range allows for different company names to be accepted
+
+  condition:
+    all of ($eml_*) and
+    1 of ($subject*) and 
+    1 of ($hello*) and 
+    4 of ($body*) 
+}