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Trend Micro InterScan Gateway Security Appliance M-Series Administrator’s Guide Best Practices Handling Compressed Files Compressed files provide a number of special security concerns. In short, compressed files can be password-protected or encrypted, they can harbor so-called "zip-of-death" threats, and they can contain within them numerous layers of compression. 14-14 To balance security and performance, Trend Micro recommends that you read the following before choosing compressed file settings: Block compressed files if... Decompressed file count exceeds: Set the number of files within a compressed archive at which InterScan Gateway Security Appliance should stop extracting. For example, have InterScan Gateway Security Appliance abandon the extraction after 1,000 files. Whenever the limit is reached, the original archive, and any decompressed files, is deleted. In addition to benefiting overall scan efficiency, setting an upper limit for decompression can prevent "zip of death" attacks designed to crash vulnerable virus scanning programs. Size of a decompressed file exceeds: Set the maximum size that files being extracted from a compressed archive are allowed to reach. Once the limit is reached, the original archive, and any decompressed files, is deleted. As with Number of files, setting an upper size limit for decompression can help prevent the “zip of death” attack. Number of layers of compression exceeds: Set the maximum number of layers (compressed file within a compressed file) you want InterScan Gateway Security Appliance to scan down through. The system maximum is 20.
Technical Support, Troubleshooting, and FAQs Scanning multiple layers of compression can slow down overall system performance, which is why the default for this parameter is 10. After detecting 10 layers of compression, InterScan Gateway Security Appliance abandons the scan task and blocks the file. Although InterScan Gateway Security Appliance can detect viruses in even the 20th layer of compression, it will only clean an infected file if it is detected in the first compression layer. Decompressed file exceeds "x" times of compressed: x: Default setting is 10 The InterScan Gateway Security Appliance provides this feature as a guard against so-called "zip of death" threats, where one or more files of a particular nature have been "super compressed." For example, to block a file that is 10MB before being compressed but is only 2 MB after being compressed, type 5 in this field, because 10MB is five times larger than 2MB. In a compressed archive comprised of multiple files, if the compression factor of one or more files exceeds the number specified here, the appliance blocks the compressed file. 14-15
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