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| public:emai:malware [2021-11-19 08:13] – [Monitoring and filtering agenda] vesely | public:emai:malware [2021-11-19 08:22] – [Monitoring and filtering agenda] vesely |
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| * [[: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#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#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) - <font inherit/inherit;;#f39c12;;inherit>[Suspicious]</font> - HTML content and attachments may contain potentially hazardous tags and attributes |
| * [[: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#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. |
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| **<font inherit/inherit;;#27ae60;;inherit>Regular/direct link</font>**: If the newsletter from **newyorker.com** contains links in the form [[https://link|https://link]].**newyorker.com/view/5dc1b3fc91f4/03075c2d** , it may be tracked down to the target URL and **is considered safe**. | **<font inherit/inherit;;#27ae60;;inherit>Regular/direct link</font>**: If the newsletter from **newyorker.com** contains links in the form [[https://link|https://link]].**newyorker.com/view/5dc1b3fc91f4/03075c2d** , it may be tracked down to the target URL and **is considered safe**. |
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| | ===== Macro in attachments ===== |
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| | ==== PDF macro ==== |
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| | PDF files include the ability to **execute code on your device** — and that’s where the danger lies! |
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| | Hence PDF files containing macro / executable code (like filling forms) are preventivelly **placed to users's quarantine** where may be carefully released by user in case content is harmless. User may "whitelist" a trustful sender so quarantine might be skipped next time. |
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| | PDF can contain the following: |
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| | //Javascript// – Javascripts are used in the website coding to control browser appearance and functionality. In past, it has been used to exploit multiple vulnerabilities in Adobe as well as many other PDF readers. |
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| | //System Commands// – Launch action in PDF can open Command window and execute commands to initiate malware. Most of the commands have now been disabled by Adobe but they might be open in other readers or earlier versions. |
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| | //Hidden Objects// – PDFs can have embedded and encrypted objects which prevents being analyzed by antivirus scanner. These objects are executed when file is opened by the user. |
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| | //Multimedia Control// – When we say PDF can have embedded objects, it could be a quicktime media or flash file. Attacker can exploit vulnerability in media players. |
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| ===== Suspicious ===== | ===== Suspicious ===== |