BleepingComputer reports that the Quantum ransomware
was able to complete an attack from initial infection to complete device encryption within a span of three hours and 44 minutes, making it one of the quickest ransomware attacks.
Security researchers at The DFIR Report discovered that Quantum ransomware achieved initial access through the IcedID malware distributed through a phishing email with an ISO file attachment. Attackers then move to bypass detection by deploying Cobalt Strike
into a C:WindowsSysWOW64cmd.exe process two hours following initial infection before exfiltrating Windows domain credentials.
"For the next hour, the threat actor proceeded to make RDP connections to other servers in the environment. Once the threat actor had a handle on the layout of the domain, they prepared to deploy the ransomware by copying the ransomware (named ttsel.exe) to each host through the C$ share folder," said DFIR, which added that the Quantum ransomware payload was deployed through WMI and PsExec.