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Update rkduck.md

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Ilya V. Matveychikov 2018-07-04 13:40:34 +04:00 committed by GitHub
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@ -35,4 +35,25 @@ Supported commands are:
- hiding/unhiding processes
- https://github.com/linux-rootkits/rkduck/blob/master/rkduck/crumbs_serv.c#L32
...
## Altering system behaviour
Hooking of system calls by patching syscall-handlers in `sys_call_table[]`:
- hook `sys_call_table[__NR_write]` (disabled)
- https://github.com/linux-rootkits/rkduck/blob/master/rkduck/duck.c#L17
- hook `file->f_op->iterate` for `/` and `/proc` dentries
- https://github.com/linux-rootkits/rkduck/blob/master/rkduck/duck.c#L25
- https://github.com/linux-rootkits/rkduck/blob/master/rkduck/duck.c#L29
- netfilter `NF_INET_PRE_ROUTING/NF_IP_PRI_FIRST` hook used for catching `ICMP` packets
- https://github.com/linux-rootkits/rkduck/blob/master/rkduck/backdoor.c#L454
- https://github.com/linux-rootkits/rkduck/blob/master/rkduck/backdoor.c#L379
## Hiding of files and directories
Filtering of directory entries:
- https://github.com/linux-rootkits/rkduck/blob/master/rkduck/vfs.c#L323 (vfs_hide_file)
- https://github.com/linux-rootkits/rkduck/blob/master/rkduck/vfs.c#L346 (vfs_unhide_file)
- https://github.com/linux-rootkits/rkduck/blob/master/rkduck/vfs.c#L97 (vfs_hijacked_iterate)
- https://github.com/linux-rootkits/rkduck/blob/master/rkduck/vfs.c#L59 (vfs_hijacked_filldir)
- https://github.com/linux-rootkits/rkduck/blob/master/rkduck/vfs.c#L157 (vfs_hijacked_proc_iterate)
- https://github.com/linux-rootkits/rkduck/blob/master/rkduck/vfs.c#L78 (vfs_hijacked_proc_filldir)