Earlier this week, we warned our users about Black Friday and Cyber Monday security threats.

Spammers and scammers have risen to the occasion with deals that are too good to be true such as in this example for fake Gucci products.

This was reported in a Tweet by Denis Sinegubko, from Unmask Parasites and also a security researcher at Sucuri:

The site boasts incredible prices on normally very expensive merchandise:

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Shoppers might get fooled by the security badges and stamps, which of course are only here for show.

Here is the domain information for gucciblackfridays.com:

Domain Name:gucciblackfridays.com
Registrar WHOIS Server: whois.hichina.com
Registrar URL: http://www.net.cn/
Updated Date:2014-10-31T09:01:21Z
Creation Date:2014-10-31T09:01:21Z
Registrar Registration Expiration Date:2015-10-31T09:01:21Z
Registrar: HICHINA ZHICHENG TECHNOLOGY LTD.
Registrar IANA ID: 420
Registrar Abuse Contact Email: abuse@list.alibaba-inc.com
Registrar Abuse Contact Phone: +86.4006008500
Registry Registrant ID:whois-protect
Registrant Name:YinSi BaoHu Yi KaiQi (Hidden by Whois Privacy Protection Service)
Registrant Organization:YinSi BaoHu Yi KaiQi (Hidden by Whois Privacy Protection Service)
Registrant Street:3/F.,HiChina Mansion,No.27 Gulouwai Avenue,Dongcheng District,Beijing 100120,China,
Registrant City:Beijing
Registrant State/Province:Beijing
Registrant Postal Code:100120
Registrant Country:CN

Traffic to these bogus sites will come from spam or, as in this case, from compromised websites.

Denis was kind enough to share the code he found inside a server that was doing these redirections.

code

As usual, we are dealing with obfuscation, in this case base64:

base64

> returns n1zb/ma5\vt0i28-pxuqy*6lrkdg9_ehcswo4+f37j

This string is further processed:

base64_2

> and returns base64_decode

That variable is used in the next eval:

eval

Interestingly, we’re not there yet. This decodes into a variable assignment and another eval:

var

final_eval

Finally, the decoded blurb can be seen below:

result

This code resides on the compromised server and performs different checks, in particular whether the user visiting the page is real or a search engine.

When we tested the script, we were first handled by a redirector:

http://kiwsi .com/go.php?alt_id='.$_GET['alt_id'].'

which at the time of writing was sending our browser to:

http://www.cheapugg .ru/

When Black Friday is over, the crooks will be ready to serve you special deals for Cyber Monday for example with this site advertising shoes: jordanscybermonday.com:

jordan

There certainly are good deals to be made during this holiday season but you really ought to be careful what you click on.

You might order counterfeit goods or have your banking credentials stolen and money depleted.

For more tips about shopping safely, please refer to our post Black Friday and Cyber Monday Online Shopping Made Safer.

@jeromesegura