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Source code viruses are rare, partly due to the difficulty of parsing source code programmatically, but have been reported to exist. One such virus (W32/Induc-A) was identified by anti-virus specialist Sophos as capable of injecting itself into the source code of any Delphi program it finds on an infected computer, and then compiles itself into ...
A computer virus [1] is a type of malware that, when executed, replicates itself by modifying other computer programs and inserting its own code into those programs. [2] [3] If this replication succeeds, the affected areas are then said to be "infected" with a computer virus, a metaphor derived from biological viruses. [4]
1260, or V2PX, [1] [2] was a polymorphic computer virus written in 1989 by Mark Washburn. Derived from Ralf Burger's publication of the disassembled Vienna Virus source code, the 1260 added a cipher and varied its signature by randomizing its decryption algorithm. Both the 1260 and Vienna infect .COM files in the current or PATH directories ...
August: Ken Thompson publishes his seminal paper, "Reflections on Trusting Trust", in which he describes how he modified a C compiler so that when used to compile a specific version of the Unix operating system, it inserts a backdoor into the login command, and when used to compile a new copy of itself, it inserts the backdoor insertion code ...
The Sobig viruses infected a host computer by way of the above-mentioned attachment. When this is started they will replicate by using their own SMTP agent engine. E-mail addresses that will be targeted by the virus are gathered from files on the host computer. The file extensions that will be searched for e-mail addresses are: .dbx.eml.hlp.htm ...
AIDS is the first virus known to exploit the MS-DOS "corresponding file" vulnerability. In MS-DOS, if the user enters FOO in the command interpreter, in a directory where both FOO.COM and FOO.EXE exist, then FOO.COM will always be executed. Thus, by creating infected COM files, AIDS code will always be executed before the intended EXE file. [2]
For example, code in the virus suppresses the printing of console messages if, say, the virus is not able to infect a file on a read-only device such as a floppy disk. One of the clues that a computer is infected is the mis-capitalization of the well-known message " Bad command or file name " as "Bad Command or file name".
The virus consisted of three components, the Dropper, the Wiper and the Reporter. The Dropper, the source of the infection, creates a service with the name 'NtsSrv' that enables it to remain persistent on the infected computer. The Dropper was built in 32-bit and 64-bit versions.