Twitter bots — automated accounts that auto-follow and send junk tweets hawking questionable wares and services — can be an annoyance to anyone who has even a modest number of followers. But increasingly, Twitter bots are being used as a tool to suppress political dissent, as evidenced by an ongoing flood of meaningless tweets directed at hashtags popular for tracking Tibetan protesters who are taking a stand against Chinese rule.
It’s not clear how long ago the bogus tweet campaigns began, but Tibetan sympathizers say they recently noticed that several Twitter hashtags related to the conflict — including #tibet and #freetibet — are now so constantly inundated with junk tweets from apparently automated Twitter accounts that the hashtags have ceased to become a useful way to track the conflict.
Mac malware is back in the news again. Last week, security firm F-Secure warned that it had discovered a Trojan built for OS X that was disguised as a PDF document. It’s not clear whether this malware is a present threat — it was apparently created sometime last year — but the mechanics of how it infects Mac systems is worth a closer look because it challenges a widely-held belief among Mac users that malicious software cannot install without explicit user permission.
Apple released a security update today designed to address the recent scourge of scareware targeting Mac users. The update comes as security experts spotted new versions of the rogue application family MacDefender making the rounds via poisoned links on Facebook.
Security Update 2011-003, available for Mac OS X v. 10.6.7 and Mac OS X Server v. 10.6.7, includes a component that checks for the MacDefender malware and its known variants. In its most recent advisory, Apple states: “If MacDefender scareware is found, the system will quit this malware, delete any persistent files, and correct any modifications made to configuration or login files. After MacDefender is identified and removed, the message below will be displayed the next time an administrator account logs in.”