Blackworm

Blackworm is a worm that may attempt to disable antivirus software, install other malware without your permission, and overwrite your computer's DOC, XLS, MDE, MDB, PPT, PPS, RAR, PDF, PSD, DMP, ZIP files with an error message ('DATA Error [47 0F 94 93 F4 K5]') on the third day of every month (i.e., February 3). Blackworm distributes itself through infected email attachments and unprotected network shares.