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The Mannequin Virus is a computer virus which infects .COM, .EXE and overlay files including COMMAND. COM. The virus is loaded into memory by executing an infected program and then affects the computer' s runtime operation, corrupts program or overlay files and data files.
 Research Mannequin Virus
The Manola Virus is a computer virus which infects .COM files including COMMAND.COM. The virus is loaded into memory by executing an infected program. The virus corrupts program or overlay files.
Research Manola Virus
The Manta Virus is a computer virus which infects .COM files including COMMAND.COM. The virus is loaded into memory by executing an infected program and then affects the computer's runtime operation, corrupts program or overlay files.
Research Manta Virus
The Marauder Virus is a computer virus which infects .COM files including COMMAND.COM. The virus is loaded into memory by executing an infected program and then affects the computer's runtime operation, corrupts program or overlay files.
Research Marauder Virus
The Mardi Bros . Virus is a computer virus which infects the fixed disk and diskette boot sectors . The virus is loaded into memory by booting from an infected disk and then affects the computer's runtime operation.
Research Mardi Bros . Virus
The Mark II Virus is a computer virus which infects .COM files including COMMAND.COM. The virus is loaded into memory by executing an infected program and then affects the computer's runtime operation and corrupts program or overlay files.
Research Mark II Virus
The Marzia Virus is a computer virus which uses stealth techniques to avoid detection and which infects the fixed disk partition table. The virus is loaded into memory by executing an infected program and then affects the computer's runtime operation and corrupts program or overlay files.
Research Marzia Virus
Masters Paradise is a network backdoor Trojan that communicates through port 31.
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Masters Paradise 9.x is a network backdoor Trojan that communicates through port 3129.
Research Masters Paradise 9.x
The Math Test Virus is a computer virus which infects .COM and .EXE files including COMMAND.COM. The virus is loaded into memory by executing an infected program and then affects the computer's runtime operation and corrupts program or overlay files.
Research Math Test Virus
The Matura Virus is a computer virus which infects .COM and .EXE files including COMMAND.COM. The virus is loaded into memory by executing an infected program and then affects the computer's runtime operation and corrupts program or overlay files.
Research Matura Virus
Mavericks Matrix is a network backdoor Trojan that communicates through port 1269.
Research Mavericks Matrix
The Mayak Virus is an encrypted computer virus which uses stealth techniques to avoid detection and which infects .COM and .EXE files including COMMAND. COM. The virus is loaded into memory by executing an infected program and then affects the computer's runtime operation and corrupts program or overlay files and data files.
Research Mayak Virus
The MCWH1022 Virus is a computer virus which infects .COM and .EXE files. The virus is loaded into memory by executing an infected program and then affects the computer's runtime operation and corrupts program or overlay files.
Research MCWH1022 Virus
The McWhale Virus is a computer virus which infects .COM and .EXE files. The virus is loaded into memory by executing an infected program. The virus corrupts program or overlay files and data files.
Research McWhale Virus
The Medical Virus is a computer virus which infects .COM files including COMMAND.COM. The virus is loaded into memory by executing an infected program and then affects the computer's runtime operation and corrupts program or overlay files and data files.
Research Medical Virus
The Meditation Virus is a computer virus which infects .COM files including COMMAND.COM. The virus is loaded into memory by executing an infected program. The virus corrupts program or overlay files and data files.
Research Meditation Virus
Melissa is a Word 97 macro virus that attempts to launch Outlook to send emails with infected Word attachments to entries in the Outlook address book. The virus caused widespread panic and hype in April 1999 when it was described as a 'new killer virus'. The Melissa virus was created by David L Smith of New Jersey, USA, and named after a stripper he had met in Miami, Florida.
Research Melissa
The Mem Lapse 323 Virus is a computer virus which infects .COM files. The virus is loaded into memory by executing an infected program and then affects the computer's runtime operation and corrupts program or overlay files.
Research Mem Lapse 323 Virus
The Mem Lapse 375 Virus is an encrypted computer virus which infects .COM files. The virus is loaded into memory by executing an infected program and then affects the computer's runtime operation and corrupts program or overlay files.
Research Mem Lapse 375 Virus
The Memory Lapse Virus is a computer virus which infects .COM and .EXE files including COMMAND.COM. The virus is loaded into memory by executing an infected program and then affects the computer's runtime operation and corrupts program or overlay files.
Research Memory Lapse Virus
Memory resident computer viruses are those which install code in memory which infects future programs. In order to accomplish this, the viruses must find a way to allocate memory for themselves - find a place to hide. Furthermore, the viruses need to establish a procedure to activate the resident code to infect files. On a PC running DOS or Windows there are two methods a virus may go memory resident. The first, and most often overlooked, method is using the TSR (Terminate-Stay-Resident) interrupt 27h or 21h function 31h. While being the easiest to invoke, this method is also the easiest to notice, which, when virus programming is concerned, being noticed is not always the most desired trait. The second and more popular technique is manipulation of the MCB's or memory control blocks. Finally, in order to activate the resident code, the virus needs to hook certain interrupts. For example, if the virus is to activate every time a program is run, the int 21h function 4bh (load/execute program) interrupt needs to be hooked. An
important aspect of a memory resident virus is being able to determine whether or not its code is already resident. If a virus does not perform a check for previous residency installation, the consequences can be disastrous. A residency check is typically accomplished by issuing a bogus interrupt to the interrupt that the virus handles. For example, if the virus hooks int 21h, the virus needs to perform in such a way that a check in the ISR can recognize itself. Many virus writers tend to load AX with an outrageous value and perform an int 21h. The virus ISR would then perform a check of AX when it receives the interrupt. If the virus is already resident, control is passed back to the host. If not, the next instruction in the virus would be to start the infection procedure.
Research Memory Resident Viruses
The Merry Xmas Virus is a computer virus which infects .EXE files. The virus is loaded into memory by executing an infected program and then affects the computer's runtime operation and corrupts program or overlay files.
Research Merry Xmas Virus
The Mexican Mud Virus is a computer virus which infects .COM files including COMMAND.COM. The virus is loaded into memory by executing an infected program and then affects the computer's runtime operation and corrupts program or overlay files.
Research Mexican Mud Virus
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Abbreviations
Computer Viruses
