Evaluating Grayware Characteristics and Risks

Table 6

File compression types by grayware in encyclopedia of Trend Micro.

ID	Compression	Description
1	Aspack	A Win32 executable compressor capable of reducing file size and resisting reverse engineering
2	FSG	A file compressor especially suitable for small EXE or ASM files.
3	PECompact	A compressor for code, data, and import/export table with proprietary compression algorithm.
4	Petite	A utility to compress and encrypt files, automatically expand files in memory when execution.
5	SFX	The Self extractor (SFX) compresses a file and transports it to a remote system where decompression is performed.
6	UPX	Ultimate Packer for eXecutables is an open-source packer performing in-place decompression.
7	Upack	Upack is a file packer based on LZMA compression.
8	Other	There are many other file compression packages such as Neolite, Nullsoft, PEPack, or RAR.