There are several signs of a wireless connection being infected by malware including your computer programs could randomly crash and pop up fake antivirus messages in windows that say they're scanning for viruses or spyware; sometimes these campaigns will redirect me to websites when really I wanted Google search results - but not always! Another sign is if new toolbars appear without knowing their purpose (in other words: malware). And finally, any time someone tries accessing my internet connection from outside the home--especially via public wifi networks-I know something fishy's going down with this device