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--- public:emai:malware [2023-03-09 09:45] – [Monitoring and filtering agenda] vesely
+++ public:emai:malware [2023-03-09 12:12] – vesely
@@ Line 14: / Line 14: @@
 Both areas of malicious or potentially problematic emails and regular emails are overlapping; it is not easy to distinguish between them sometimes.
+<font inherit/inherit;;#f39c12;;inherit>**Both areas**</font>  of
+ <font inherit/inherit;;#c0392b;;inherit>**malicious or potentially problematic emails**</font>  and
+ <font inherit/inherit;;#339933;;inherit>**regular emails**</font>  ** <font inherit/inherit;;#f39c12;;inherit>are overlapping</font> **; it is not easy to distinguish between them sometimes.
 **The most dangerous threats are usually those of the "zero day attack" nature**; they usually take advantage of badly protected or misprotected email servers and domains so they can mimic the regular sender.\\
@@ Line 37: / Line 42: @@
   * [[:public:emai:malware#spf_hard_fail|SPF hard fail]] - sending server __is not on the allowed list__  provided by domain's owner and the domain owner asks for message blocking.
-  * [[:public:emai:malware#spf_soft_fail|SPF soft fail]] - <font inherit/inherit;;#f39c12;;inherit>[Suspicious - SPF - soft fail]</font>  - sending server is not listed among allowed ones, but the domain owner allow message passing with warning.
+  * [[:public:emai:malware#spf_soft_fail|SPF soft fail]] -
-  * [[:public:emai:malware#spf_bad_alignment|SPF bad alignment]] - <font inherit/inherit;;#f39c12;;inherit>[Covert sender]</font>  - verify the authenticity of the domain sending the email by using two diffrenent header signatures in the message.
+ <font inherit/inherit;;#f39c12;;inherit>[Suspicious - SPF - soft fail]</font>  - sending server is not listed among allowed ones, but the domain owner allow message passing with warning.
-  * [[:public:emai:malware#bad_dmarc|Bad DMARC]] - <font inherit/inherit;;#f39c12;;inherit>[Bad DMARC]</font>  - the sender's domain does not have DMARC record and SPF set properly.
+  * [[:public:emai:malware#spf_bad_alignment|SPF bad alignment]] -
-  * [[:public:emai:malware#arc|Bad ARC]] - <font inherit/inherit;;#f39c12;;inherit>[Suspicious - bad ARC]</font>  - the sender's email has ARC Seal but it's validation did not succed (e.g. invalid calculated email hash).
+ <font inherit/inherit;;#f39c12;;inherit>[Covert sender]</font>  - verify the authenticity of the domain sending the email by using two diffrenent header signatures in the message.
-  * [[:public:emai:malware#ip_reputation_database_-_dnsbl|DNSBL listed]] - <font inherit/inherit;;#f39c12;;inherit>[IP reputation - DNSBL listed]</font>  - the sender's IP is listed in SPAM database.
+  * [[:public:emai:malware#bad_dmarc|Bad DMARC]] -
-  * [[:public:emai:malware#suspicious_newsletter|Suspicious Newsletter]] - <font inherit/inherit;;#f39c12;;inherit>[Newsletter]</font>  - it may be found that certain newsletters are suspicious because they may actually be spam under the disguise of newsletters.
+ <font inherit/inherit;;#f39c12;;inherit>[Bad DMARC]</font>  - the sender's domain does not have DMARC record and SPF set properly.
-  * [[:public:emai:malware#ip_reputation|Bad IP reputation]] - <font inherit/inherit;;#f39c12;;inherit>[IP reputaton]</font>  - emails from IP addresses with bad reputation may be discarded or quarantined. It may be dangerous to receive emails from such IPs.
+  * [[:public:emai:malware#arc|Bad ARC]] -
-  * [[:public:emai:malware#warning_disclaimer_prepended_to_email|Warning Disclaimer]] (prepended to email) - <font inherit/inherit;;#f39c12;;inherit>[Newsletter]</font> - Anti-Phishing engine cannot decide about targeting URL link (usually concealed by click spying)
+ <font inherit/inherit;;#f39c12;;inherit>[Suspicious - bad ARC]</font>  - the sender's email has ARC Seal but it's validation did not succed (e.g. invalid calculated email hash).
+  * [[:public:emai:malware#ip_reputation_database_-_dnsbl|DNSBL listed]] -
+ <font inherit/inherit;;#f39c12;;inherit>[IP reputation - DNSBL listed]</font>  - the sender's IP is listed in SPAM database.
+  * [[:public:emai:malware#suspicious_newsletter|Suspicious Newsletter]] -
+ <font inherit/inherit;;#f39c12;;inherit>[Newsletter]</font>  - it may be found that certain newsletters are suspicious because they may actually be spam under the disguise of newsletters.
+  * [[:public:emai:malware#ip_reputation|Bad IP reputation]] -
+ <font inherit/inherit;;#f39c12;;inherit>[IP reputaton]</font>  - emails from IP addresses with bad reputation may be discarded or quarantined. It may be dangerous to receive emails from such IPs.
+  * [[:public:emai:malware#warning_disclaimer_prepended_to_email|Warning Disclaimer]] (prepended to email) -
+ <font inherit/inherit;;#f39c12;;inherit>[Newsletter]</font>  - Anti-Phishing engine cannot decide about targeting URL link (usually concealed by click spying)
   * [[:public:emai:malware#pdf_macro|PDF macro]] - PDF files include the ability to execute code on your device — and that’s where the danger lies
-  * [[:public:emai:malware#suspicious_content_html_links_docs_macro|Suspicious content]] (HTML links, docs) - <font inherit/inherit;;#f39c12;;inherit>[Suspicious]</font> - HTML content and attachments may contain potentially hazardous tags and attributes
+  * [[:public:emai:malware#suspicious_content_html_links_docs_macro|Suspicious content]] (HTML links, docs) -
-  * [[:public:emai:malware#image_spam|Image Spam]] (images, pdf) - <font inherit/inherit;;#f39c12;;inherit>[Image spam]</font>  - Some spammers conceal spam text as an image or PDF document.
+ <font inherit/inherit;;#f39c12;;inherit>[Suspicious]</font>  - HTML content and attachments may contain potentially hazardous tags and attributes
-  * [[:public:emai:malware#deepheader_analysis|Deepheader analysis]] - <font inherit/inherit;;#f39c12;;inherit>[Suspicious - header analysis]</font>  - Deepheader analysis examines the entire message header for spam characteristics.
+  * [[:public:emai:malware#image_spam|Image Spam]] (images, pdf) -
+ <font inherit/inherit;;#f39c12;;inherit>[Image spam]</font>  - Some spammers conceal spam text as an image or PDF document.
+  * [[:public:emai:malware#deepheader_analysis|Deepheader analysis]] -
+ <font inherit/inherit;;#f39c12;;inherit>[Suspicious - header analysis]</font>  - Deepheader analysis examines the entire message header for spam characteristics.
 ===== Possible Spoof =====