Hidenowt.1741.a
Description Hidenowt.1741.a
It is a harmless memory resident parasitic partly encrypted virus. It writes itself to the end of .COM and .EXE files. When an infected file is executed, the virus infects the C:COMMAND.COM file, then it traces and hooks INT 21h, then it infects the files on DOS calls FindFirst/Next.
The virus uses anti-debug tricks. It contains two text strings, the former is encrypted, the latter is used as virus-ID word:
C:COMMAND.COM
Yx
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PD.1070
Description PD.1070
It is a harmless nonmemory resident encrypted parasitic virus. It searches for COM and EXE files and writes itself to the end of the file. On Sunday it disinfects the files instead of infecting them. It contains the text string:
Hi!PD
Pdp Family
Description Pdp Family
These are very dangerous memory resident parasitic viruses. They hook int 21h and infects COM and EXE files that are accessed ("Pdp.822" infects COM files only). Being executed these viruses try to infect C:COMMAND.COM file. They contains the text strings:
PDP11
C:COMMAND.COM
AID,VIR,DINF,CHK,TEST,AUR,PAV,NAV,-V,SENT,ASM,SCAN,LEAN,ANT,SAFE,BOOT,STRA,
The last string contains the names of the programs that are deleted by the virus when they are executed.
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