Virus Database

Die.666

Description Die.666

These are not dangerous memory resident parasitic viruses. They hook INT 21h and write themselves at the end of COM- and EXE-files are executed.
In some cases "Die.666" decrypts and displays the message:
VIRUS INFO.

It contains the internal text string also:
Die

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Phardera.5824

Description Phardera.5824

This is a benign memory resident parasitic polymorphic virus. It hooks INT 21h, and writes itself to the end of COM and EXE files that are executed. The resident code of virus is also encrypted with different keys, and the virus decrypts/encrypts its routines "on-the-fly" in case of need. The virus also uses a lot of anti-debugging tricks.
On the 10th of each month, the virus displays the following message:
Phardera + Dianita

The virus contains the text strings:
Phardera
-by Phardera'95-----Batavia--------Indonesia----
RaredrahP Dianita

Phoenix Family

Description Phoenix Family

These are very dangerous resident polymorphic parasitic viruses. They write themselves to the middle of COM files that are executed or closed. They write to the end of EXE files the trojan program that in some cases erases all information on installed hard disks.
"Phoenix.Proud,Live" infect COM files only, "Phoenix.Live.a" does not infect COMMAND.COM.
While infecting a COM file the virus reads the data from the middle of the file, saves it to the end of the file, and then overwrites the data in the file middle with its copy and writes Jmp-Virus command to the beginning of the file. While infecting COMMAND.COM the virus writes itself to the the stack area of COMMAND.COM, and the file length does not grow.
Infection of COM file Infection of COMMAND.COM file
+-----------+ +-----------+ +-----------+ +-----------+
¦ File ¦ ¦ File ¦ ¦COMMAND.COM¦ ¦COMMAND.COM¦
¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦
¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦
+ - - - - - ¦ +-----------¦ + - - - - - ¦ +-----------¦
¦ ¦--+ ¦ Virus ¦ ¦ ¦ ¦ Virus ¦
+ - - - - - ¦ ¦ +-----------¦ + - - - - - ¦ +-----------¦
+-----------+ ¦ ¦- - - - - -¦ +-----------+ +-----------+
+-->¦ ¦
+-----------+

The viruses also hook INT 13h and then, depending on some preconditions, randomly rearrange bytes in information blocks being read from, and written to disks.
The viruses of the family for the first time uses two new methods. First, the viruses intercept DOS calls to the files by using INT 2Ah instead of INT 21h. Second, the viruses (except "Phoenix.Live.a") are polymorphic and do not have any constant mask (signature): the main part of the virus is encrypted, and a decoding program (32 bytes long) is selected from 204 possible variants (one have to bear in mind that these viruses have the following lengths: "Phoenix" - 1704 bytes, "Phoenix.Evil" - 1701 bytes, "Phoenix.Proud" - 1102 bytes).
The viruses contain the text strings:
"Phoenix": PHOENIX
"Phoenix.Evil": The evil that men do lives on and on and onall
"Phoenix.Proud": Proudly made in Sofia
"Phoenix.Live.a,b": Live after Death

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