![]() The Hafnium hackers have been observed stealing files and emails from affected companies, as well as installing connections to a remote server. This software could give Hafnium complete remote control over affected systems. Once Hafnium compromises its victims’ servers it deploys a web shell, a malicious interface that gives hackers the ability to steal data or install malicious software. While Microsoft has rolled out patches for the four Exchange critical vulnerabilities, as the NSC points out, installing the security updates does not remove threat actors that have already compromised the network – or undo any damage that might have already been done. “Several” cyber-espionage groups have been exploiting the Exchange vulnerabilities, ESET added. Telemetry data from cybersecurity firm ESET indicates the majority of attacks are against US organisations, with 267 observed attacks. Microsoft says that the two attacks are not connected.Īndy Miles, chief information security officer at risk management business Quantum Resilience, told Verdict that “on the balance of probabilities” UK organisations must also have been compromised. ![]() If the new estimates are correct, the scale of the attack has already exceeded that of the recent SolarWinds hack, in which a tainted software update gave suspected Russian nation-state hackers remote access to large numbers of targeted networks. ![]() It is essential that any organization with a vulnerable server take immediate measures to determine if they were already targeted.” “Patching and mitigation is not remediation if the servers have already been compromised. The US National Security Council (NSC) warned that CIOs and CISOs should not just patch and relax, tweeting: Exchange Online is not believed to be affected. The White House press office joined the chorus of warnings, stating that the Microsoft Exchange hack is “an active threat” and urging government departments, the private sector and academia to patch their on-premises exchange servers. Worldwide the number is likely to be much higher, with Krebs suggesting that the global total is likely to top 100,000. Separately, Reuters reports that more than 20,000 US organisations have been compromised via the Exchange Server zero-days.
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