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It infected .COM files and had the effect of making text on the screen fall (or cascade) down and form a heap at the bottom of the screen. It was notable for using an encryption algorithm to avoid being detected. However, one could see that infected files had their size increased by 1701 or 1704 bytes.
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ABC, discovered in October 1992, is a memory-resident, file-infecting computer virus which infects EXE files and may alter both COM and EXE files. ABC activates on the 13th day of every month. Upon infection, ABC becomes memory-resident at the top of system memory but below the 640 K DOS boundary and hooks interrupts 16 and 1C.
The name "Spacefiller" was introduced because most viruses write their code to the end of the infected file, with infected files being detectable because their file size increases. In contrast, CIH looks for gaps in the existing program code, where it then writes its code, preventing an increase in file size; in that way, the virus avoids ...
SYS file, Ontario.2048 goes memory resident and infects files of these times upon being opened. COMMAND.COM is infected using a special routine, and will not increase in file size. Infected files will increase in size by 2,048 bytes. However, when Ontario.2048 is in memory, no increase in file size will be observed due to the virus' stealthing.
Upon execution, whether from an infected file or the Cholera dropper, CTX will check to see if its payload routine should activate (see Payload). If not, CTX will infect EXE files. CTX has a polymorphic nature, which is neither particularly simple or complex in nature. CTX also obscures the entry point of files to avoid detection. The virus ...
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When the infected documents are shared with other users and systems, the virus spreads. Macro viruses have been used as a method of installing software on a system without the user's consent, as they can be used to download and install software from the internet through the use of automated key-presses.