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https://github.com/sqall01/LSMS.git
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93 lines
2.6 KiB
Python
93 lines
2.6 KiB
Python
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#!/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 uses calls such as memfd_create() to create an anonymous file in RAM that can be run.
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Requirements:
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None
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Reference:
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https://www.sandflysecurity.com/blog/detecting-linux-memfd_create-fileless-malware-with-command-line-forensics/
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"""
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import os
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import socket
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# Read configuration and library functions.
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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_memfd_create import ACTIVATED
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from lib.alerts import raise_alert_alertr, raise_alert_mail
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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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ACTIVATED = True
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def search_deleted_memfd_files():
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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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# Get all suspicious ELF files.
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fd = os.popen("ls -laR /proc/*/exe 2> /dev/null | grep memfd:.*\(deleted\)")
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suspicious_exe_raw = fd.read().strip()
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fd.close()
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suspicious_exes = []
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if suspicious_exe_raw.strip():
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suspicious_exes.extend(suspicious_exe_raw.strip().split("\n"))
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for suspicious_exe in suspicious_exes:
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if print_output:
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print("SUSPICIOUS")
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print(suspicious_exe)
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print("")
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else:
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if ALERTR_FIFO is not None:
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hostname = socket.gethostname()
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optional_data = dict()
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optional_data["suspicious_exe"] = suspicious_exe
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optional_data["hostname"] = hostname
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message = "Deleted memfd file on host '%s' found.\n\n" % hostname
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message += suspicious_exe
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optional_data["message"] = message
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raise_alert_alertr(ALERTR_FIFO,
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optional_data)
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if FROM_ADDR is not None and TO_ADDR is not None:
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hostname = socket.gethostname()
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subject = "[Security] Deleted memfd file on '%s'" % hostname
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message = "Deleted memfd file on host '%s' found.\n\n" % hostname
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message += suspicious_exe
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raise_alert_mail(FROM_ADDR,
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TO_ADDR,
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subject,
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message)
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if __name__ == '__main__':
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search_deleted_memfd_files()
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