mirror of https://github.com/sqall01/LSMS.git
109 lines
3.1 KiB
Python
Executable File
109 lines
3.1 KiB
Python
Executable File
#!/usr/bin/env python3
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# written by sqall
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# twitter: https://twitter.com/sqall01
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# blog: https://h4des.org
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# github: https://github.com/sqall01
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#
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# Licensed under the MIT License.
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"""
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Short summary:
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Malware will name itself with [brackets] to impersonate a Linux kernel thread.
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Any Linux process that looks like a [kernel thread] should have an empty maps file.
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Site note:
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when using ps auxwf | grep "\\[" they are children of [kthreadd]
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Requirements:
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None
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Reference:
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https://twitter.com/CraigHRowland/status/1232399132632813568
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https://www.sandflysecurity.com/blog/detecting-linux-kernel-process-masquerading-with-command-line-forensics/
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"""
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import os
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import sys
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from lib.util import output_error, output_finding
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# Read configuration.
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try:
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from config.config import ALERTR_FIFO, FROM_ADDR, TO_ADDR
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from config.search_non_kthreads import NON_KTHREAD_WHITELIST, ACTIVATED
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except:
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ALERTR_FIFO = None
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FROM_ADDR = None
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TO_ADDR = None
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NON_KTHREAD_WHITELIST = []
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ACTIVATED = True
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def search_suspicious_process():
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# Decide where to output results.
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print_output = False
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if ALERTR_FIFO is None and FROM_ADDR is None and TO_ADDR is None:
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print_output = True
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if not ACTIVATED:
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if print_output:
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print("Module deactivated.")
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return
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# Iterate over all processes that have a "[".
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fd = os.popen("ps auxw | grep \\\\[ | awk '{print $2}'")
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pids_raw = fd.read().strip()
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fd.close()
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for pid in pids_raw.split("\n"):
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# Get process name of pid.
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fd = os.popen("ps u -p %s" % pid)
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ps_output = fd.read().strip()
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fd.close()
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fd = os.popen("ps u -p %s | awk '{$1=$2=$3=$4=$5=$6=$7=$8=$9=$10=\"\"; print $0}'" % pid)
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process_name_raw = fd.read().strip()
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fd.close()
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for process_name in process_name_raw.split("\n"):
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process_name = process_name.strip()
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# Ignore COMMAND since it is part of the headline of ps output.
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if process_name == "COMMAND":
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continue
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# Check if we have whitelisted the process
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# (e.g., [lxc monitor] /var/lib/lxc satellite).
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elif process_name in NON_KTHREAD_WHITELIST:
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continue
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# Only consider process names that start with a "["
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# (e.g., "avahi-daemon: running [towelie.local]"" does not)
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elif process_name.startswith("["):
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file_path = "/proc/%s/maps" % pid
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try:
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with open(file_path, 'rt') as fp:
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data = fp.read()
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if data == "":
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continue
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except Exception as e:
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output_error(__file__, str(e))
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continue
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message = "Process with pid '%s' suspicious.\n\n" % pid
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message += ps_output
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output_finding(__file__, message)
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if __name__ == '__main__':
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is_init_run = False
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if len(sys.argv) == 2:
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if sys.argv[1] == "--init":
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is_init_run = True
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# Script does not need to establish a state.
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if not is_init_run:
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search_suspicious_process()
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