This is a ransomware attack in which malware encrypts, or effectively scrambles, a computer’s hard drive such that the data stored on it can no longer be read. Perpetrators claim the process will be reversed on payment of a ransom.
WannaCry appears to spread over networks, rather than requiring users to be tricked into clicking malicious phishing links. This means it instead relies on organisations not having applied existing Microsoft security patches.
Quick action by security researchers has provided a reprieve from the initial attack. However, a second wave of infections has been reported so organisations that have not moved to shore-up their security are still at high risk.
Details are still emerging about this attack and the situation is developing. However, some facts are known and Telstra wishes to offer some general information which may help internet users and businesses avoid infection and minimise damage if they are impacted.
All users running Windows systems:
Businesses running Windows systems:
Consider implementing phishing awareness training within your organisation. While WannaCry appears to spread without input from victims, copycat attacks in coming weeks are possible and could be delivered over phishing.
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