We have noticed a change of behaviour in the latest spam email campaigns used by Locky. Since its first release Locky took advantage of compromised domains to download the dropper binary, while recently Locky dropper is being delivered embedded into the loader code itself. By tracking these campaigns we have also noticed that Locky’s authors have made several attempts at embedding the dropper into the loader.
Continue reading “Locky Dropper Now Comes Embedded in the Loader”
We have already written about Nemucod downloader when it was paired with 7-Zip, this time we have spotted a new variant in the wild that appears to be a further evolution from previous versions. Before we dig into the analysis part, let’s take a quick look at the most recent history of Nemucod:
Continue reading “Nemucod meets a new buddy: PHP”
ReaQta has been monitoring a new and massive worldwide Locky ransomware spam campaign. The attacks are carried out in the usual way: a javascript file attached to an email message delivered to the victims, although this is the first campaign we have tracked that shows a different deployment behaviour. The javascript downloader usually retrieves Locky’s dropper from a compromised website, while in this case the downloaded file is encoded making it harder for traditional protection solutions to spot the incoming threat.
Continue reading “Locky Ransomware Shipping With a New Loader”
Nemucod is a Javascript downloader used to perform all kind of nasty stuff, recently a “ransomware” routine has been found in some samples, even if a simple one: a XOR with a predefined 255 bytes key. In other instances we have observed the download of a malicious executable responsible for the encryption process. What we will analyze this time is a variant that downloads the infamous Kovter together with the official 7zip CLI application.