Kustanai.2071
Description Kustanai.2071
It is not a dangerous memory resident encrypted parasitic virus. It infects COM and EXE files. While infecting the virus encrypts and writes its code to the end of file, then writes decryption routine to the middle of file at random selected address, then modifies file header.
The virus intercepts LOGIN utility execution and stores all keystrokes that are entered during LOGIN's run (to do that the virus uses INT 9 hook). While infecting next files the virus writes to the file's end these keystrokes as well as its actual code. As a result the virus a) is able "to steal" network passwords; b) increases file length by VirusLength (2071 bytes) plus keystrokes buffer length (up to 255 bytes).
When an infected file is executed, the virus hooks INT 9, 21h and stays memory resident. By hooking INT 21h the virus runs its infection routine: it affects files that are executed, opened, renamed or created. When anti-virus programs AIDSTEST, ADINF, DRWEB, SCAN are executed, the virus temporary disables infection of file opening, but infects files when they are closed.
On 10th of any month the virus displays the message:
This is Kustanai-Login. Is devoted Kuzmina Olya. TVA-96 me 16!
Check other viruses! Be aware! Use Antiviral Software
HXH.1680
Description HXH.1680
This is a benign memory resident polymorphic parasitic virus. It hooks INT 21h, and writes itself to the end of COM and EXE files that are executed or accessed by FindFirst/Next FCB DOS functions (DIR command). On February 19, the virus hooks INT 1Ch, plays a tune and displays the following message:
HXH:
Wherever,Long Live Our Friendship!
Good Luck With You! My Friend.
Yours Sincerly 6162910
Hybrid.1306
Description Hybrid.1306
This is a very dangerous non-memory resident encrypted parasitic virus. It searches for .COM files, and writes itself to the end of the file. In December, it writes a Trojan program into the boot sector of the current disk. When the system is booting from such a boot sector, the Trojan program formats the disk.
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