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Guess Who? Cryptowall’s Back to Hold Your Files Hostage

15/01/2015 by Sharon Shahzad

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The infamous Crowti ransomware often dubbed Cryptowall is back with a new campaign, this time using the I2P anonymity network to communicate with its command and control infrastructure.

Cryptowall 3.0 was spotted by both Microsoft and French researcher Kafeine, who each released screenshots showing the malware hadn’t changed much from a victim-facing perspective. However, its use of I2P is an evolution of the popular ransomware.

“It seems communication with the C&C are Rc4 encoded (key seems to be alphanum sorted path of the POST) and using i2p protocol,” wrote Kafeine. “So...they are sadly back..and we can expect a lot of them in Exploit Kit, Spam, tasks in Botnet etc....”

The Microsoft Malware Protection Center’s Marianne Mallen said Redmond had seen a sudden spike from no infections on 11 January to 288 the following day, after an almost two month hiatus for Crowti.

“It still follows the same behavior as previous variants, with minimal modifications such as changes in ransom notification file names,” she explained. “The files are still customized for each infected user with a personal link to decryption instructions page that are still done over Tor network.”

Microsoft was forced to issue an advisory on Cryptowall in October last year, having seen the ransomware spike to around 4000 infected machines – mainly in the US (71%).

This article has been extracted from http://www.infosecurity-magazine.com, please click on this link to read the article in full http://www.infosecurity-magazine.com/news/cryptowalls-back-to-hold-your/

Montash is a multi-award winning global technology recruitment business. Specialising in permanent and contract positions across mid-senior appointments across a wide range of industry sectors and IT functions, including:

ERP, BI & Data, Information Security, IT Architecture & Strategy, Energy Technology, Demand IT and Business Engagement, Digital and E-commerce, Leadership Talent, Infrastructure and Service Delivery, Project and Programme Delivery.

Montash is headquartered in Old Street, London, in the heart of the technology hub. Montash has completed assignments in over 30 countries and has appointed technical professionals from board level to senior and mid management in permanent and contract roles.

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