San Jose-based eBay was hammered by a massive cyberattack allegedly carried out by a pro-Iran hacking group that’s now threatening some of world’s biggest tech companies. The shadowy “Islamic Cyber Resistance in Iraq – 313 Team” claimed responsibility for the assault on eBay, which reportedly triggered widespread outages and left users unable to browse listings , make purchases or complete transactions for nearly two days last month. Cybersecurity analysts said the attack bore the hallmarks of a Distributed Denial of Service , or DDoS, assault — a tactic where hackers flood a company’s servers with fake traffic until systems buckle under the pressure. The widespread outages left users unable to browse listings. Getty Images The group bragged online that it used “rapid fire” attacks designed to keep eBay’s infrastructure under constant strain, while also warning that more American companies were in the crosshairs. “There is a simple way out,” one message directed at eBay read.…