
Marco de adquisición de evidencias de Linux
Autor: Alexandra Cartwright
Abril, 2022
Linux Evidence Acquisition Framework (LEAF) adquiere artefactos y evidencia de sistemas Linux EXT4, aceptando entrada del usuario para personalizar la funcionalidad de la herramienta para una escalabilidad más fácil. Ofreciendo varios módulos y parámetros como entrada, LEAF es capaz de usar análisis inteligente para extraer artefactos de Linux y generar un archivo de imagen ISO.
LEAF_master.py [-h] [-i INPUT [INPUT ...]] [-o OUTPUT] [-u USERS [USERS ...]] [-c CATEGORIES [CATEGORIES ...]] [-v]
[-s] [-g [GET_FILE_BY_OWNER [GET_FILE_BY_OWNER ...]]] [-y [YARA [YARA ...]]]
[-yr [YARA_RECURSIVE [YARA_RECURSIVE ...]]] [-yd [YARA_DESTINATIONS [YARA_DESTINATIONS...]]]
LEAF (Linux Evidence Acquisition Framework) - Cartware
____ _________ ___________ __________
/ / / _____/ / ____ / / ______/
/ / / /____ / /___/ / / /____
/ / / _____/ / ____ / / _____/
/ /_____ / /_____ / / / / / /
/_________/ /_________/ /___/ /___/ /___/ v2.0
Procesa sistemas de archivos Ubuntu 20.04/Debian para artefactos forenses, extrae datos importantes y exporta información a un archivo ISO9660. Compatible con el sistema de archivos EXT4 y ubicaciones comunes en el sistema operativo Ubuntu 20.04. Consulta la página de ayuda para más información. Uso sugerido: No ejecutar desde el directorio LEAF/
optional arguments:
-h, --help show this help message and exit
-i INPUT [INPUT ...], --input INPUT [INPUT ...]
Additional Input locations. Separate multiple input files with spaces
Default: /home/user1/Desktop/LEAF-3/target_locations
-o OUTPUT, --output OUTPUT
Output directory location
Default: ./LEAF_output
-u USERS [USERS ...], --users USERS [USERS ...]
Users to include in output, separated by spaces (i.e. -u alice bob root).
Users not present in /etc/passwd will be removed
Default: All non-service users in /etc/passwd
-c CATEGORIES [CATEGORIES ...], --categories CATEGORIES [CATEGORIES ...]
Explicit artifact categories to include during acquisition.
Categories must be separated by space, (i.e. -c network users apache).
Full List of built-in categories includes:
APPLICATIONS, EXECUTIONS, LOGS, MISC, NETWORK, SHELL, STARTUP, SERVICES, SYSTEM, TRASH, USERS
Categories are compatible with user-inputted files as long as they follow the notation:
# CATEGORY
/location1
/location2
.../location[n]
# END CATEGORY
Default: "all"
-v, --verbose Output in verbose mode, (may conflict with progress bar)
Default: False
-s, --save Save the raw evidence directory
Default: False
-g [GET_OWNERSHIP [GET_OWNERSHIP ...]], --get_ownership [GET_OWNERSHIP [GET_OWNERSHIP ...]]
Get files and directories owned by included users.
Enabling this will increase parsing time.
Use -g alone to parse from / root directory.
Include paths after -g to specify target locations (i.e. "-g /etc /home/user/Downloads/
Default: Disabled
-y [YARA [YARA ...]], --yara [YARA [YARA ...]]
Configure Yara IOC scanning. Select -y alone to enable Yara scanning.
Specify '-y /path/to/yara/' to specify custom input location.
For multiple inputs, use spaces between items,
i.e. '-y rulefile1.yar rulefile2.yara rule_dir/'
All yara files must have ".yar" or ".yara" extension.
Default: None
-yr [YARA_RECURSIVE [YARA_RECURSIVE ...]], --yara_recursive [YARA_RECURSIVE [YARA_RECURSIVE ...]]
Configure Recursive Yara IOC scanning.
For multiple inputs, use spaces between items,
i.e. '-yr rulefile1.yar rulefile2.yara rule_dir/'.
Directories in this list will be scanned recursively.
Can be used in conjunction with the normal -y flag,
but intersecting directories will take recursive priority.
Default: None
-yd [YARA_DESTINATIONS [YARA_DESTINATIONS...]], --yara_destinations [YARA_DESTINATIONS [YARA_DESTINATIONS...]]
Destination to run yara files against.
Separate multiple targets with a space.(i.e. /home/alice/ /bin/star/)
Default: All user directories
To use default arguments [this will use default input file (./target_locations), users (all users), categories (all categories), and output location (./LEAF_output/). Cloned data will not be stored in a local directory, verbose mode is off, and yara scanning is disabled]:
LEAF_main.py
All arguments:
LEAF_main.py -i /home/alice/Desktop/customfile1.txt -o /home/alice/Desktop/ExampleOutput/ -c logs startup services apache -u alice bob charlie -s -v -y /path/to/yara_rule1.yar -yr /path2/to/yara_rules/ -yd /home/frank -g /etc/
To specify usernames, categories, and yara files:
LEAF_main.py -u alice bob charlie -c applications executions users -y /home/alice/Desktop/yara1.yar /home/alice/Desktop/yara2.yar
To include custom input file(s) and categories:
LEAF_main.py -i /home/alice/Desktop/customfile1.txt /home/alice/Desktop/customfile2.txt -c apache xampp
apt install python3)apt install pip3)pip3 install -r requirements.txt)sudo -H pip3 install -r requirements.txtsudo python3 LEAF_master.py con argumentos opcionales