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Can malware, if running within a plug-in or elsewhere within the browser, or if downloaded and executed, or within a site that attempts intrusion, attack other machines on the local network, even if no local shares are setup?

Examples too, please for Windows?

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closed as off topic by Ƭᴇcʜιᴇ007, Linker3000, MaQleod, Nifle, studiohack Aug 24 '11 at 2:21

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Depends on the malware. But this question is off-topic for SU. Please check out the FAQ. – Ƭᴇcʜιᴇ007 Aug 23 '11 at 14:15
@techie007 Unless he is asking about browser security.. – digitxp Aug 23 '11 at 15:11
@techie007 which I am. – therobyouknow Aug 23 '11 at 15:18
IMO This isn't really a question that's suited to SU, as it's very vague, and hypothetical without knowing the configuration of the network in question. We like specific, answerable questions. But I'll put in a vague answer, just because. ;) – Ƭᴇcʜιᴇ007 Aug 23 '11 at 15:30
I always state that I have given a vote for an answer or a question, and the reason why. Who was the coward who downvoted this question? It's already clear that some folk are saying this question may not fit in su's remit but maybe that remit should be extended. If people really dislike this question on SU, I'd be happy to withdraw/delete it - but then we'd also lose the valuable answers already given - and with that the time people took to make them. – therobyouknow Aug 24 '11 at 9:08
up vote 3 down vote accepted

Yes, malware obtained through any source may proceed to attack other Windows computers on the local network. Even if no shares are set up, these attacks often use the administrative shares which are enabled by default (C$, for example) in professional versions of windows. They may also rely on exploits in entirely different subsystems.

a high-profile example would be downadup/conficker, which after initial connection would attempt brute-forcing of the administrative passwords on other Windows machines on the network.

This is why any computer suspected to be infected should be isolated from the network.

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+1 Accepted because of the modes of attacks and examples and course of action. – therobyouknow Aug 23 '11 at 20:31

Yes, some malware you run can attack other machines on the network.

Will it be successful? Depends (on informaiton we don't have).

Examples of malware which attempt to spread? Check SARC (Symantec AntiVirus Research Center).

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Viruses cannot crawl networks, worms can, Viruses can infect networks but is done by infected files being – Moab Aug 23 '11 at 18:51
+1 for confirming the question (i.e. yes / no = yes) and for examples. – therobyouknow Aug 23 '11 at 20:31
moab: true enough, I'll fix it up. – Ƭᴇcʜιᴇ007 Aug 23 '11 at 20:50

Absolutely. Once a hacker (or cracker, if you know the difference) takes control of a machine using a client side exploit (via browser vulnerabilities, that is sending you a malicious link that will fingerprint your browser/plugins and launch adequate exploits against them to compromise the system), he will typically try to escalate privileges (get ADMIN access), then pivot around the network. Pivoting involves launching scans and trying to exploit vulnerabilities in neighbor systems in the network. These vulnerabilities can be detected in any service running in the network.

Yes, open shares are often a hacker's favorite but even if all open shares are closed, the attacker can exploit other outdated services in the network.

See this video demonstration of pivoting after a successfull client side exploit using the free open source exploitation framework Metasploit.

I Hope this helps!

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