It is a very dangerous nonmemory resident parasitic virus. It is an EXE file packed with LzExe. Being executed it searches for .COM and .EXE files in current and PATH directories, then writes itself to the beginning of the file. While infecting the virus encrypts the original file header and writes it to the end of the file.
The virus has a bug and corrupts files of small length. It also deletes the CHKLIST.MS if it exists. The virus contains the text strings:
WEED - v1.1
*.exe *.com
path
chklist.ms
