Threat actors are constantly changing their tactics, techniques, and procedures (TTP) to increase the chances of getting their malicious payloads delivered. Spam and phishing emails are still the most common methods used for delivering malware, with the malicious payloads often downloaded via the web via hyperlinks embedded in emails.
A new tactic that has been adopted by the threat group behind the IcedID banking Trojan cum malware downloader involves hijacking contact forms on company websites. Contact forms are used on most websites to allow individuals to register interest. These contact forms typically have CAPTCHA protections which limit their potential for use in malicious campaigns, as they block bots and require each contact request to be performed manually.
However, the threat actors behind the IcedID banking Trojan have found a way of bypassing CATCHA protections and have been using contact forms to deliver malicious emails. The emails generated by contact forms will usually be delivered to inboxes, as the contact forms are trusted and are often whitelisted, which means email security gateways will not block any malicious messages.
In this campaign, the contact forms are used to send messages threatening legal action over a copyright violation. The messages submitted claim the company has used images on its website that have been added without the image owner’s permission. The message threatens legal action if the images are not immediately removed from the website, and a hyperlink is provided in the message to Google Sites that contains details of the copyrighted images and proof they are the intellectual property of the sender of the message.
Clicking the hyperlink to review the supplied evidence will result in the download of zip file containing an obfuscated .js downloader that will deliver the IcedID payload. Once IcedID is installed, it will deliver secondary payloads such as TrickBot, Qakbot, and Ryuk ransomware.
IcedID distribution has increased in recent weeks, not only via this method but also via phishing emails. A large-scale phishing campaign is underway that uses a variety of business-themed lures in phishing emails with Excel attachments that have Excel 4 macros that deliver the banking Trojan.
The increase in IcedID malware distribution is likely part of a campaign to infect large numbers of devices to create a botnet that can be rented out to other threat groups under the malware-as-a-service model. Now that the Emotet botnet has been taken down, which was used to deliver different malware and ransomware variants, there is a gap in the market and IcedID could be the threat that takes over from Emotet. In many ways the IcedID Trojan is very similar to Emotet and could become the leading malware-as-a-service offering for delivering malware payloads.
To find out how you can protect your business against malware and phishing threats at a reasonable price, give the TitanHQ team a call today and discover for yourself why TitanHQ email and web security solutions consistently get 5-star ratings from users for protection, price, ease of use, and customer service and support.