Security experts from FireEye have spotted a Locky ransomware campaign mainly targeting the healthcare sector, Telecom and Transportation industries.
Attackers launched a massive phishing campaign to deliver the threat. The campaign bit organizations worldwide, mostly in the US, Japan, South Korea.
“These detection spikes and change in tactics suggest that the cybercriminals are investing more to infect systems and maximize their profits. Additionally, we have observed that the delivery of Dridex via this distribution channel seems to have stopped, or nearly so, which could explain why we are seeing the Locky uptick.”
The researchers believe crooks are investing to compromise systems maximizing their efforts. Another interesting trend reported by FireEye is the pause in the distribution of the Dridex banking Trojan through the same channel.
Experts noticed many similarities in the macro code used by Attackers in three distinct Locky campaigns running on Aug. 9, Aug. 11 and Aug. 15.
The following are the key comparisons:
Plain [i] = Cipher [i] ^ Key [i % length of Key], where Plain is the computed plain text, Cipher is the cipher text, Key is the xor key, and i is the byte offset.
The evidence collected by the researchers suggest the involvement of a single or multiple attackers in a coordinated effort.
(Security Affairs – Locky Ransomware, critical infrastructure)