Around April 2022, security researchers tracked a significant spike in malicious emails using password-protected .7z archives. : Often delivered the Emotet Trojan.
: They explain why the hackers used the .7z format (it has a higher compression ratio and was less scrutinized by legacy scanners). 💡 Why this file is "Interesting" APRIL_10-04-2022.7z
The SANS "Handler's Diary" provided real-time analysis in April 2022. They detailed how attackers switched to .7z files to bypass email filters that were previously blocking .zip files. 2. Brad Duncan's Malware-Traffic-Analysis This is the "gold standard" for this specific file. : PCAP files and malware samples. Link : Malware-Traffic-Analysis.net 💡 Why this file is "Interesting" The SANS
: Used "thread hijacking" (replying to old email chains). File Name : Followed the pattern [Month]_[Date]-[Year].7z . Lure : Contained a malicious .lnk or .vbs file inside. 📝 Recommended Blog Coverage Around April 2022
📌 : If you actually have this file, do not extract it on a host machine. It is almost certainly a live malware sample.
: It marked a shift where attackers used password-protected archives to hide the payload from automated sandbox analysis.
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