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https://github.com/neo23x0/loki
Loki - Simple IOC and YARA Scanner
https://github.com/neo23x0/loki
antivirus dfir hash ioc otx python scanner signature yara yara-rules
Last synced: about 2 months ago
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Loki - Simple IOC and YARA Scanner
- Host: GitHub
- URL: https://github.com/neo23x0/loki
- Owner: Neo23x0
- License: gpl-3.0
- Created: 2015-01-18T08:39:49.000Z (over 9 years ago)
- Default Branch: master
- Last Pushed: 2024-03-04T08:33:09.000Z (7 months ago)
- Last Synced: 2024-08-01T02:17:20.078Z (about 2 months ago)
- Topics: antivirus, dfir, hash, ioc, otx, python, scanner, signature, yara, yara-rules
- Language: Python
- Homepage: https://www.nextron-systems.com/compare-our-scanners/
- Size: 67.6 MB
- Stars: 3,307
- Watchers: 187
- Forks: 579
- Open Issues: 30
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
[](https://gist.github.com/cheerfulstoic/d107229326a01ff0f333a1d3476e068d)
## Important Note
This project is only inactively maintained. This means that I merge pull request for bug fixes and issues that can be easily integrated but I don't have the time to add new features or extend existing ones. For years, I've been working on a much more sohpisticated scanner called THOR. There is a free version of THOR Lite available. THOR Lite is faster, more stable, tested in our CI environments and simply the better solution. You can find a comparison of the open source, free and commercial scanner [here](https://www.nextron-systems.com/thor-lite/). I've also started working on a Rust-based version of LOKI called [LOKI 2](https://github.com/Neo23x0/Loki2) but I have no idea when it's in a state that reflects the current feature set of LOKI. A while ago I made a [flow chart](https://twitter.com/cyb3rops/status/1361980419223207936) to help you with the decision which scanner to use.
# Loki - Simple IOC and YARA Scanner
Scanner for Simple Indicators of Compromise
Detection is based on four detection methods:
1. File Name IOC
Regex match on full file path/name
2. Yara Rule Check
Yara signature match on file data and process memory
3. Hash Check
Compares known malicious hashes (MD5, SHA1, SHA256) with scanned files
4. C2 Back Connect Check
Compares process connection endpoints with C2 IOCs (new since version v.10)
Additional Checks:
1. Regin filesystem check (via --reginfs)
2. Process anomaly check (based on [Sysforensics](http://goo.gl/P99QZQ)
3. SWF decompressed scan (new since version v0.8)
4. SAM dump check
The Windows binary is compiled with PyInstaller and should run as x86 application on both x86 and x64 based systems.
## How-To Run LOKI and Analyse the Reports
### Run
- Download the newest version of LOKI from the [releases](https://github.com/Neo23x0/Loki/releases) section
- Extract the program package
- Run loki-upgrader.exe on system with Internet access to retrieve the newest signatures
- Bring the program folder to a target system that should be scanned: removable media, network share, folder on target system
- Open a command line "cmd.exe" as Administrator and run it from there (you can also run LOKI without administrative privileges but some checks will be disabled and relevant objects on disk will not be accessible)
### Reports
- The resulting report will show a GREEN, YELLOW or RED result line.
- Please analyse the findings yourself by:
1. uploading non-confidential samples to Virustotal.com
2. Search the web for the filename
3. Search the web for keywords from the rule name (e.g. EQUATIONGroupMalware_1 > search for "Equation Group")
4. Search the web for the MD5 hash of the sample
- Please report back false positives via the "Issues" section, which is accessible via the right sidebar (mention the false positive indicator like a hash and/or filename and the rule name that triggered)
## Requirements
No requirements if you use the compiled EXE.
If you want to build it yourself:
- [yara](https://github.com/VirusTotal/yara-python/releases) : It's recommended to use the most recent version of the compiled packages for Windows (x86) - Download it from here: https://github.com/VirusTotal/yara-python/releases
- [colorama](https://pypi.python.org/pypi/colorama) : to color it up
- [psutil](https://pypi.python.org/pypi/psutil) : process checks
- [pywin32](http://sourceforge.net/projects/pywin32/) : path conversions (PyInstaller [issue](https://github.com/pyinstaller/pyinstaller/issues/1282); Windows only)
# Usage
usage: loki.py [-h] [-p path] [-s kilobyte] [-l log-file] [-r remote-loghost]
[-t remote-syslog-port] [-a alert-level] [-w warning-level]
[-n notice-level] [--allhds] [--alldrives] [--printall]
[--allreasons] [--noprocscan] [--nofilescan] [--vulnchecks]
[--nolevcheck] [--scriptanalysis] [--rootkit] [--noindicator]
[--dontwait] [--intense] [--csv] [--onlyrelevant] [--nolog]
[--update] [--debug] [--maxworkingset MAXWORKINGSET]
[--syslogtcp] [--logfolder log-folder] [--nopesieve]
[--pesieveshellc] [--nolisten]
[--excludeprocess EXCLUDEPROCESS] [--force]
Loki - Simple IOC Scanner
optional arguments:
-h, --help show this help message and exit
-p path Path to scan
-s kilobyte Maximum file size to check in KB (default 5000 KB)
-l log-file Log file
-r remote-loghost Remote syslog system
-t remote-syslog-port
Remote syslog port
-a alert-level Alert score
-w warning-level Warning score
-n notice-level Notice score
--allhds Scan all local hard drives (Windows only)
--alldrives Scan all drives (including network drives and
removable media)
--printall Print all files that are scanned
--allreasons Print all reasons that caused the score
--noprocscan Skip the process scan
--nofilescan Skip the file scan
--vulnchecks Run the vulnerability checks
--nolevcheck Skip the Levenshtein distance check
--scriptanalysis Statistical analysis for scripts to detect obfuscated
code (beta)
--rootkit Skip the rootkit check
--noindicator Do not show a progress indicator
--dontwait Do not wait on exit
--intense Intense scan mode (also scan unknown file types and
all extensions)
--csv Write CSV log format to STDOUT (machine processing)
--onlyrelevant Only print warnings or alerts
--nolog Don't write a local log file
--update Update the signatures from the "signature-base" sub
repository
--debug Debug output
--maxworkingset MAXWORKINGSET
Maximum working set size of processes to scan (in MB,
default 100 MB)
--syslogtcp Use TCP instead of UDP for syslog logging
--logfolder log-folder
Folder to use for logging when log file is not
specified
--nopesieve Do not perform pe-sieve scans
--pesieveshellc Perform pe-sieve shellcode scan
--nolisten Dot not show listening connections
--excludeprocess EXCLUDEPROCESS
Specify an executable name to exclude from scans, can
be used multiple times
--force Force the scan on a certain folder (even if excluded
with hard exclude in LOKI's code
## Signature and IOCs
Since version 0.15 the Yara signatures reside in the sub-repository [signature-base](https://github.com/Neo23x0/signature-base). You will not get the sub-repository by downloading the LOKI as ZIP file. It will be included when you clone the repository.
The IOC files for hashes and filenames are stored in the './signature-base/iocs' folder. All '.yar' files placed in the './signature-base/yara' folder will be initialized together with the rule set that is already included. Use the 'score' value to define the level of the message upon a signature match.
You can add hash, c2 and filename IOCs by adding files to the './signature-base/iocs' subfolder. All hash IOCs and filename IOC files must be in the format used by LOKI (see the default files). The files must have the strings "hash", "filename" or "c2" in their name to get pulled during initialization.
For Hash IOCs (divided by newline; hash type is detected automatically)
```
Hash;Description [Reference]
```
For Filename IOCs (divided by newline)
```
# (optional) Description [Reference]
Filename as Regex[;Score as integer[;False-positive as Regex]]
```
# User-Defined Scan Excludes
Since version v0.16.2 LOKI supports the definition of user-defined excludes via "excludes.cfg" in the new "./config" folder. Each line represents a regular expression that gets applied to the full file path during the directory walk. This way you can exclude certain directories regardless of their drive name, file extensions in certain folders and all files and directories that belong to a product that is sensitive to antivirus scanning.
The '''exclude.cfg''' looks like this:
# Excluded directories
#
# - add directories you want to exclude from the scan
# - double escape back slashes
# - values are case-insensitive
# - remember to use back slashes on Windows and slashes on Linux / Unix / OSX
# - each line contains a regex that matches somewhere in the full path (case insensitive)
# e.g.:
# Regex: \\System32\\
# Matches C:\Windows\System32\cmd.exe
#
# Regex: /var/log/[^/]+\.log
# Matches: /var/log/test.log
# Not Matches: /var/log/test.gz
#
# Useful examples
\\Ntfrs\\
\\Ntds\\
\\EDB[^\.]+\.log
Sysvol\\Staging\\Nntfrs_cmp
\\System Volume Information\\DFSR
# Screenshots
Loki Scan
Regin Matches
Regin False Positives
Hash based IOCs
File Name based IOCs
Generated log file
# Contact
LOKI scanner on our company homepage
[https://www.nextron-systems.com/loki/](https://www.nextron-systems.com/loki/)
Twitter
[@cyb3rOps](https://twitter.com/Cyb3rOps)
[@thor_scanner](https://twitter.com/thor_scanner)
If you are interested in a corporate solution for APT scanning, check out Loki's big brother [THOR](https://www.nextron-systems.com/thor/).
# Compile the Scanner
Download [PyInstaller](https://github.com/pyinstaller/pyinstaller/releases/), switch to the pyinstaller program directory and execute:
python ./pyinstaller.py -F C:\path\to\loki.py
This will create a `loki.exe` in the subfolder `./loki/dist`.
## Pro Tip (optional)
To include the msvcr100.dll to improve the target os compatibility change the line in the file `./loki/loki.spec` that contains `a.binaries,` to the following:
a.binaries + [('msvcr100.dll', 'C:\Windows\System32\msvcr100.dll', 'BINARY')],
# Use LOKI on Mac OS X (Or later) or Linux
- Install libraries ```sudo pip install colorama yara-python psutil rfc5424-logging-handler netaddr```
- Run loki-upgrader.py ```sudo python loki-upgrader.py```
- Run loki ```sudo python loki.py```
# Yara sources
Download Yara sources from [here](https://github.com/VirusTotal/yara/releases)
# Antivirus - False Positives
The compiled scanner may be detected by antivirus engines. This is caused by the fact that the scanner is a compiled python script that implement some file system and process scanning features that are also used in compiled malware code.
If you don't trust the compiled executable, please compile it yourself.
# License
Loki - Simple IOC Scanner
Copyright (c) 2015 Florian Roth
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see [http://www.gnu.org/licenses/](http://www.gnu.org/licenses/)