Cybercriminals are currently spamvertising millions of emails impersonating Discover, in an attempt to trick cardholders into clicking on the client-side exploits serving URLs found in the malicious emails. Upon clicking on the links, users are exposed to the client-side exploits served by the latest version of the Black Hole Exploit Kit.

More details:

Sample screenshot of the spamvertised email:

Sample compromised URLs used in the campaign: hxxp://; hxxp://; hxxp://; hxxp://; hxxp://; hxxp://

Client-side exploits serving URLs: hxxp://; hxxp://

Upon loading, these URLs attempt to exploit CVE-2010-0188 by dropping a malicious PDF file on the affected host, which then drops the actual malware upon successful client-side exploitation.

Sample detection rate for the dropped malware: MD5: 80601551f1c83ee326b3094e468c6b42 – detected by 4 out of 44 antivirus scanners as UDS:DangerousObject.Multi.Generic

Upon execution, the sample phones back to, AS21574

Client-side exploits serving domain reconnaissance: responds to, AS2519 – Email:
Name Server: NS2.CHELSEAFUN.NET – –, AS2519
Name Server:  NS1.TOPPAUDIO.COM –
Name Server:  NS2.TOPPAUDIO.COM –

The same name servers (NS1.TOPPAUDIO.COM; NS2.TOPPAUDIO.COM) were also used in the recently profiled “BofA ‘Online Banking Passcode Reset’ themed emails serve client-side exploits and malware“; “‘ADP Immediate Notification’ themed emails lead to Black Hole Exploit Kit“, indicating a connection between these campaigns.

Responding to the same IP ( are also the following malicious domains part of the campaign’s infrastructure:

We’ve also seen ( used in the recently profiled “‘ADP Immediate Notification’ themed emails lead to Black Hole Exploit Kit” campaign, indicating that these campaigns are operated by the same cybercriminal/gang of cybercriminals.

Webroot SecureAnywhere users are proactively protected from these threats.

You can find more about Dancho Danchev at his LinkedIn Profile. You can also follow him on  Twitter.

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The Webroot blog offers expert insights and analysis into the latest cybersecurity trends. Whether you’re a home or business user, we’re dedicated to giving you the awareness and knowledge needed to stay ahead of today’s cyber threats.

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