Escan advisory wannacry ransomware

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eScan Advisory

WannaCry Ransomware Version: eWR-1.0.0

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WannaCry Ransomware Description: WannaCry, also known as WannaCrypt, WanaCrypt0r 2.0, Wanna Decryptor, has affected PC's in more than 70 countries in an unprecedented attack, which was th launched on 12 May 2017.

Very recently, a hacker group going by the name Shadow brokers, had leaked NSA's hacking tools and vulnerabilities and one of them was Eternal Blue exploit which relied on a SMB Exploit to hack into other connected / networked PCs in a network. This exploit was what was used by WannaCry to dig a hole into PC's globally. So far the Ransomware has affected over 200K computers all over the globe.

Global Heat Map:

How can it impact you: WannaCry Ransomware, has targeted industries to individual users, right across healthcare, financial, manufacturing and government verticals. This has resulted in sudden crippling of businesses with valuable loss of sensitive data. Some estimates also are of that the attack also exploited to capture banking information from people who had paid the ransoms in bitcoins. This Ransomware has also caused reputation losses for many businesses and trust among its customers. The demand of $300 for the decrypt key by the attackers, were not an assurance to receive the keys and instances

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were also reported where the attackers had doubled the demand money if not paid within 48 hours and after the seven day deadline, the files get completely deleted.

WannaCry Ransomware exploited the vulnerability of Windows Operating System th

discovered by NSA earlier and Microsoft had already provided the patch on 14 March with an advisory to update the systems.

India being one of the largest legacy system users as well many pirated software users among individuals, is one of the most vulnerable countries in terms of the spreading possibilities of WannaCry. Hence, users need to take utmost precaution to find all possible vulnerabilities in their network and use patch updates to safeguard any probable exploit. According to admission by officials of the Indian Government, 70% of Indian ATMs, out of the 2.19 Lac ATMs, are still running on Windows XP! Hence, RBI has issued an advisory to patch all the ATMs before resuming their normal banking operations, with immediate effect.

How does eScan protect against Ransomware attacks: eScan's Proactive Behavioral Analysis Engine (PBAE) monitors the activity of all processes on the Local Machine and when it encounters any activity or behavior that matches to Ransomware, a red flag is raised and the process is blocked. In case, if an infected system tries to access network share of a protected system and encrypt/modify files residing on that system, PBAE will immediately invalidate the network session.

Along with WannaCry, PBAE is also successfully blocking Ransomware attacks such as Locky, Zepto, Crysis and many more. Additionally, by analyzing the data collected through our Cloud (ESN), we are able to successfully detect and mitigate thousands of Ransomware attacks on all systems protected by eScan. eScan's Active Virus Control (AVC) also proactively protects the system from infection, when it is being executed in real-time. It's not just the PBAE but also the AVC which identifies and blocks the execution of malware / Trojans, including Ransomware of all types and variants.

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Statistics:

As per the eScan R&D, the telemetry data collected from its Cloud Server shows that by th

14 May 2017 the WannaCry infection has reduced after spike in infections after the breakout on 12th May. However, since past two days being holidays and the advisories being released worldwide, infections may reduce, while there would be a rise in detection of WannaCry infection attempts.

Moreover, since humans are the weakest link in the entire ecosystem of IT Security, we believe that although advisories have been released and everyone has been made aware of WannaCry attack, an employee advisory should be circulated internally not to click or try opening any attachments from unknown sources received through emails and the Security Administrators should implement the patch issued by Microsoft across the Windows Systems in their network.

The threat report can be viewed by visiting this link https://www.escanav.com/en/threat-report/

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WannaCry File Extensions: WannaCry, after encrypting the files, changes the extension to one of the below mentioned:  .WNCYR

 .WNCRY

 .WCRY

 .WNCRYT

 .WCRYT

 .WNRY

Prevention Measures:  Download

and implement MS17-010 patch, from the below link :

https://technet.microsoft.com/en-us/library/security/ms17-010.aspx  Administrators should block all executable files from being transmitted via eMails.  Administrators should isolate the affected system in the Network.  Administrator can restore the encrypted files from the backup or from system restore

point (if enabled) for affected systems.  Install and Configure eScan with all security modules active.

i) ii) iii)

eScan Real Time Monitoring eScan Proactive protection eScan Firewall IDS/IPS Intrusion prevention

 Users shouldn't enable macros in documents.  Organizations should deploy and maintain a backup solution.  Most important, Organizations should implement MailScan at the Gateway Level for

mail servers, to contain the spread of suspicious attachments

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