Caw is a dangerous memory resident Win95/98 virus. When an infected program is run the virus gets control, switches itself from application level (Ring3) to Windows kernel (Ring0), allocates a block of Windows memory, hooks file access functions (IFS API) and stays memory resident as a system VxD driver. The virus then intercepts file opening function and writes itself to the end of PE EXE files that are opened. While infecting a file the virus increases last file section and writes itself to there.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
The virus has a bug and in some cases corrupts files while infecting them. When such files are run they cause a standard Windows message about error in application to appear.
The virus has two dangerous payloads. 1s: on 7th of July on each file opening the virus erases 16 sectors at random position on the drive C:.
If current minutes are equal to 0 the virus deletes the files that are being opened: WINWORD.EXE, and files with extensions:
BMP JPG DOC WRI BAS SAV PDF RTF TXT
The second payload can be 'customized': if there is the file called 'C:\AW' the virus gets file names and extensions from this file, and deletes them.
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