Update reptile.md

details/reptile.md

@@ -1,14 +1,53 @@
 # Reptile kernel rootkit details
 
 https://github.com/f0rb1dd3n/Reptile
-  
-| Feature | Description | Implementation Details |
-| --- | --- | --- |
-| Environment | 2.6.x/3.x/4.x (x86) | `sys_call_table` search method is x86-only |
-| Persistency | /etc/modules or /etc/rc.modules | Boot-time module loading using OS-specific startup files.  |
-| Management interface | `kill(2)` | `sys_call_table[__NR_kill]` |
-| Altering system (library) behaviour | Hooking of system calls | `sys_call_table` patching using `CR0/WP`   |
-| Hiding (tampering) of file contents | Filtering while reading | `sys_call_table[__NR_read]` |
-| Hiding of files and directories | Filtering of directory entries | `sys_call_table[__NR_getdents]`  `sys_call_table[__NR_getdents64]` |
-| Hiding of processes and process trees | Filtering of `/proc` | Filtering PID-like numeric entries while listing `/proc`. Hidden tasks are marked using `task->flags \| 0x10000000`. Not able to hide all threads and children of hidden (parent) process. |
-| Detection evasion | Hides own components | Hide files, unlinks module from `module_list`, alters contents of startup files while reading.  |
+
+## Environment
+
+- Linux kernel 2.6.x/3.x/4.x
+- x86 (`sys_call_table` search method is x86-only)
+
+## Persistency
+
+Boot-time module loading using OS-specific startup files:
+ - /etc/modules
+ - /etc/rc.modules
+
+## Detection evasion
+
+Rootkit is trying to evade from detection by:
+ - hiding of own files
+ - hiding of kernel module by unlinking from `module_list`
+ - tampering contents of startup files while reading
+
+## Management interface
+
+Implemented via `kill(2)` by hooking `sys_call_table[__NR_kill]` entry. Supported commands are:
+ - hiding/unhiding processes
+ - hiding/unhiding rootkit's module
+ - enabling/disabling of tampering file content function
+ - gaining root priveleges to calling process
+
+## Altering system (library) behaviour
+
+Hooking of system calls by patching syscall-handlers in `sys_call_table[]`.
+
+To write to read-only page `CR0/WP` technique used (x86-only).
+
+## Hiding (tampering) of file contents
+
+Filtering of file content while reading by hooking:
+ - `sys_call_table[__NR_read]`.
+
+## Hiding of files and directories
+
+Filtering of directory entries by hoocking:
+ - `sys_call_table[__NR_getdents]`, `sys_call_table[__NR_getdents64]`
+
+## Hiding of processes and process trees
+
+Filtering PID-like numeric entries while listing `/proc`.
+
+Hidden tasks are marked using `task->flags \| 0x10000000`.
+
+Not able to hide all threads and children of hidden (parent) process.