By employing machine learning algorithms, we were able to discover an enormous certificate signing abuse by BrowseFox, a potentially unwanted application (PUA) detected by Trend Micro as PUA_BROWSEFOX.SMC. BrowseFox is a marketing adware plugin that illicitly injects pop-up ads and discount deals. While it uses a legitimate software process, the adware plugin may be exploited…Read More
The TorrentLocker ransomware, which has been in a lull as of late, has recently come back with new variants that are using a new delivery mechanism that uses abused Dropbox accounts. This new type of attack is in line with our 2017 prediction that ransomware would continue to evolve beyond the usual attack vectors.Read More
Crysis (detected by Trend Micro as RANSOM_CRYSIS.A), a ransomware family first detected in February this year, has been spotted targeting businesses in Australia in New Zealand through remote desktop protocol (RDP) brute force attacks.
Crysis has been reported in early June this year to have set its sights into carving a market share left by TeslaCrypt when the latter’s developers decided to shut down their operations, and rivaling Locky’s prevalence in the ransomware threat landscape.Read More
Recently I discussed how TorrentLocker spam was using email authentication for its spam runs. At the time, I suggested that these spam runs were using email authentication to gather information about victim networks and potentially improve the ability to evade spam filters. DomainKeys Identified Mail’s (DKIM) own specification mentions the possibility of messages with from “trusted sources” and with a…Read More
In monitoring the ransomware TorrentLocker, we noticed a new development in its arrival vector. In previous entries, we noted that a particular wave of the crypto-ransomware was using spammed messages that were designed to evade spam filters. Our research now shows that TorrentLocker malware are using emails that are designed to pass spam filters and…Read More