It is a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of COM and EXE files that are executed or accessed. When any infected program is executed the virus also searches for first EXE file in current directory and infects it.
The virus uses not accurate way to install itself into the system memory. As a result it can halt the system. The virus cancels access to hidden disk files by DOS Find calls, as a result the hidden files on computer stays "invisible" for DOS file managers and "DIR /AH" command. The virus contains the text strings:
WRA
NOEMS
Novosibirsk
