Replication Through Removable Media

Created the Friday 18 October 2024. Updated 4 weeks, 2 days ago.

Adversaries may move onto systems, possibly those on disconnected or air-gapped networks, by copying malware to removable media and taking advantage of Autorun features when the media is inserted into a system and executes.

Technique Identifiers

U1012 T1091

Code Snippets

import pyudev, time, os


def getMountPath(devPath):
    #print(f'[+] Grabbing mount path for {devPath}')
    time.sleep(20) # We sleep for a bit to give the /proc/mounts file time to refresh & contain mount path for devpath
    try:
        with open("/proc/mounts", "r") as mFile:
            #print('[+] Reading /proc/mounts')
            for line in mFile:
                parts = line.split()
                if devPath.strip() in parts:
                        #print(f'[+] Mount path found for {devPath}: {parts[1]}') #parts[1] -> full file path
                        return parts[1]
    except:
        print("[!] Cannot open /proc/mounts!")
        
def getDevPath():
    print('[-] Waiting for USB device insertion...')
    context = pyudev.Context()

    monitor = pyudev.Monitor.from_netlink(context)
    monitor.filter_by('block')

    monitor.start()

    for device in iter(monitor.poll, None):
        if device.device_type in ('disk', 'partition'):
            device_node = device.device_node
            if device.action == 'add':
                print(f'[+] Device connected: {device_node}!')
                

                mntPath = getMountPath(device_node)
                if mntPath is not None:
                	print(f'[+] Mount path for {device_node}: {mntPath}')

def main():
	getDevPath()

if __name__ == '__main__':
	main()

About Author Open Snippet

Author: Issac Briones (1d8) / Target Platform: Linux

Contributors

Issac Briones (1d8)

Additional Resources

External Links

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Replication Through Removable Media, Technique T1091 - Enterprise | MITRE ATT&CK®