Virus Name: Carzy
V Status: New
Discovery: April, 1995
Symptoms: .COM & .EXE growth; TSR; file date/time changes;
programs fail to function properly; zero byte hidden file
Eff Length: 9,849 - 9,863 Bytes
Type Code: PRsA - Parasitic Resident .COM & .EXE Infector
Detection Method: ViruScan, F-Prot, NAV, AVTK, Sweep, IBMAV, NAVDX,
VAlert, PCScan, ChAV,
Sweep/N, AVTK/N, NShld, IBMAV/N, NAV/N, LProt, Innoc
Removal Instructions: Delete infected files
The Carzy or Carzy.A virus was received in April, 1995. It appears
to be from Taiwan. Carzy is a memory resident infector of .COM and
.EXE files, but not COMMAND.COM.
When the first Carzy infected program is executed, this virus will
install itself memory resident as a low system memory TSR of 10,160
bytes. Interrupt 21 will be hooked by the virus in memory.
Once the Carzy virus is memory resident, it will infect .COM and
.EXE files when they are executed. Programs infected with the
Carzy virus will have a file length increase of 9,849 to 9,863 bytes
with the virus being located at the end of the file. The program's
date and time in the DOS disk directory listing will have been
updated to the current system date and time when infection occurred.
The following text strings are visible within the viral code in all
"Ruei-Chiang Virus by Mad Satan"
"1994 (C) Copyright Ruei-Chiang Virus Written by Mad
Satan in TAIWAN."
"Carzy !!! Another Masterpiece of Satan....."
"Don't Worry I just a Virus."
"Satan Ver 3.01 - Mad Satan -"
"Mad Satan Mad Satan"
The last text string is actually repeated several times in a block.
Programs infected with the Carzy virus will usually fail to function
when executed, returning the system user to the DOS prompt. The
virus will also write a zero (0) byte file with the name "SATAN_05"
to infected disks which will have the read-only, system, and hidden
Known variant(s) of Carzy are:
Carzy.B: Received in July, 1995, Carzy.B is a variant of the
Carzy virus described above. The following text string is visible
within the viral code in all infected files:
"\COMMAND.COM Program too big to fit in memory"
This virus will write a zero (0) byte file to infected disks
with the file name "abbaĞ|38" with the read-only, system, and
hidden attributes set.
Origin: Unknown July, 1995.