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    Rewterz Threat Alert – WannaCry still Lurks on Infected Computers, 18 months after the initial outburst

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    Rewterz Threat Advisory – CVE-2022-42436 – IBM MQ Vulnerability
    Severity Medium Analysis Summary CVE-2022-42436 IBM MQ Managed File Transfer could allow a local user to obtain sensitive information from diagnostic files. Impact Indicators Of Compromise […]
    March 19, 2023
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    Rewterz Threat Advisory – ICS: Rockwell Automation Modbus TCP AOI Server Vulnerability
    Severity Medium Analysis Summary CVE-2023-0027 Rockwell Automation Modbus TCP AOI Server could allow a remote attacker to obtain sensitive information. By sending a malformed message, an […]
    March 17, 2023
    March 17, 2023
    Rewterz Threat Advisory – ICS: Multiple Schneider Electric IGSS Vulnerabilities
    Severity High Analysis Summary CVE-2023-27984 CVSS:7.8 Schneider Electric IGSS could allow a remote attacker to execute arbitrary code on the system, caused by improper input validation […]

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    16
    pdf-file (1)
    Annual Threat Intelligence Report 2022
    • Threat Advisories
    • Monthly Threat Insights
    • Threat Intelligence Reports
  • Why Rewterz?

    About Us

    Before Rewterz got its start, the market was in dire need of a specialized and dedicated information security company. It was nearly impossible for businesses to find a trustworthy provider that could truly cover all of their bases. We wanted to meet this need, giving companies across the globe a chance to get ahead while knowing that their data is in good hands.

    Read More

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    At Rewterz, we believe that businesses have a responsibility to impact positively and contribute to the well-being of our communities as well as the planet. That's why we are committed to operating in a socially responsible and sustainable way.

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Rewterz Threat Alert – WannaCry still Lurks on Infected Computers, 18 months after the initial outburst

December 27, 2018

SEVERITY: LOW

 

 

CATEGORY: INFORMATIVE UPDATES

 

 

ANALYSIS SUMMARY:

 

 

Eighteen months after the initial outburst, WannaCry ransomware still lurks on hundreds of infected computers and continues towards infecting more computers.

 

When the WannaCry was first unleashed, Kryptos Logic security researcher Marcus Hutchins registered a domain that acted as a killswitch for the ransomware component of the infection. If the infection would connect to this killswitch domain, the ransomware component would not activate. The infection however, silently runs in the background and keeps on checking the killswitch routinely to check whether the domain is still live.

 

The initial outburst of WannaCry in 2017 was just a beginning, as many security analysts predicted higher levels of attack. Here’s one of such alerts.

 

As they predicted, the espionage continues till date. The WannaCry domain is observed to be receiving 17 million
connections coming from 630 unique IP addresses from 194 different countries in a week.

 

What is WannaCry?

 

The WannaCry ransomware has multiple components. It arrives on the infected machine in form of a dropper. It’s a self contained program which extracts the other application components embedded within itself.
Those components are:

  • An application that encrypts and decrypts data
  • Files containing encryption keys
  • A copy of Tor

 

Once it is launched, WannaCry tries to access a hard coded URL (Killswitch), and if it can’t, it searches for and encrypts files in a slew of important formats ranging from MS Office to MP3s, leaving them inaccessible to the user and displays a ransom notice to the user, demanding bitcoins to decrypt the files.

 

Below is the graph showing countries that are still infected with WannaCry.

 

 

 

 

All it needs is an Internet outage to occur and for the kill switch domain to no longer be accessible for the ransomware to kick in.

 

 

REMEDIATION:

 

 

It is recommended to monitor your range of IP addresses for all known infections, including WannaCry and similar malware families.

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Transform

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