Zip
New ‘Zombie ZIP’ technique lets malware slip past security tools
A new technique dubbed “Zombie ZIP” helps conceal payloads in compressed files specially created to avoid detection from security solutions such as antivirus and endpoint detection and response (EDR) products. Trying to extract the files with standard utilities like WinRAR or 7-Zip results in errors or corrupted data. The technique works by manipulating ZIP headers to trick parsing engines into […]
Gootloader now uses 1,000-part ZIP archives for stealthy delivery
The Gootloader malware, typically used for initial access, is now using a malformed ZIP archive designed to evade detection by concatenating up to 1,000 archives. In doing so, the malware, which is an archived JScript file, causes many tools to crash when trying to analyze it. According to researchers, the malicious file is successfully unpacked using the default […]
Hackers now use ZIP file concatenation to evade detection
Hackers are targeting Windows machines using the ZIP file concatenation technique to deliver malicious payloads in compressed archives without security solutions detecting them. The technique exploits the different methods ZIP parsers and archive managers handle concatenated ZIP files. This new trend was spotted by Perception Point, who discovered a a concatentated ZIP archive hiding a trojan while […]