Critical WeChat bug allowed worm to spread via unanswered calls, says security firm

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Security company Calif has discovered weaponised, and privately reported a critical vulnerability that allowed it to create ‘WeWorm', a worm that spreads via WeChat calls without any user interaction.

During its rampage, the WeWorm compromises the WeChat account, and uses the saved contacts to propagate itself further, potentially reaching millions of devices. The worm can hop from smartphone to smartphone, regardless of whether they are running iOS or Android.

It will spread whether or not the victim answers the call. It will fail only if the victim declines the call within seconds. But the attacker can call again when the victim is unable to decline the call.

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