Online Info Blog: Millions of Net Users Possibly Exposed
“Without requiring any user interaction, the initial script reports information about the victim’s machine to the attacker’s remote server. Based on server-side logic, the target is then served either a clean image or its almost imperceptibly modified malicious evil twin.
“Using the known Internet Explorer vulnerability CVE-2016-0162, the encoded script attempts to verify that it is not being run in a monitored environment such as a malware analyst’s machine,” and if the script does not detect any signs of monitoring, it redirects to the Stegano exploit kit’s landing page.
Upon successful exploitation, the executed shell code collects information on installed security products and performs – as paranoid as the cyber-criminals behind this attack – yet another check to verify that it is not being monitored. If results are favorable, it will attempt to download the encrypted payload from the same server again, disguised as a gif image.