Attackers are always looking for new tricks to distribute malware without them being detected by antivirus scanners and secure email gateways. This was illustrated in a new phishing campaign that utilised a specially crafted ZIP file that was designed to bypass secure email gateways to distribute the NanoCore RAT.
Every ZIP archive contains a special structure that contains the compressed data and information about the compressed files. Each ZIP archive also contains a single “End of Central Directory” (EOCD) record, which is used to indicate the end of the archive structure.
In a new spam campaign discovered by TrustWave, researchers encountered a spam email pretending to be shipping information from an Export Operation Specialist of USCO Logistics.
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