PSA: Petya Ransomware Affecting Critical Systems Globally: Here’s What to Do.

Petya Ransomware

This is a public service announcement from Wordfence due to the widespread and severe nature of this attack. A major ransomware attack targeting Microsoft Windows systems is affecting companies and systems, many of them critical, on a global scale.

What We Know

A new ransomware variant is spreading quickly across the globe at the time of this writing. There is no consensus yet in the security research community, so the following information is provisional in nature:

The ransomware has been dubbed “Petya.” It likely spreads by using two separate exploits. You don’t need to click on anything or take any action. This can spread into your system through the network. That is why it is having such a wide impact and why it is important that you update your system to protect yourself.

For the technically minded: This ransomware is exploiting a vulnerability in Microsoft Office when handling RTF documents (CVE-2017-0199). It also exploits a vulnerability in SMBv1 which is the Microsoft file-sharing protocol. This second vulnerability is described in Microsoft security bulletin MS17-010.

The ransomware has affected a large number of companies, organizations and government entities on an international scale.

What To Do

If you have not done so already, you should immediately install the MS17-010 patch from Microsoft.

If you currently run an unpatched Windows system, you may not have time to patch it before you are infected. Consider shutting down your machine, if feasible, and leaving it off the network until there is consensus in the research community on what this exploits and how to protect against it.

If you are technically able to, we recommend you block network access to port 445 on your Windows workstations. You may also want to monitor traffic to that port if you are a security professional.

Keep an eye on the Microsoft Security Response Center where they will hopefully release formal guidance soon.

Update your anti-virus definitions and run a scan on your system. You can find out which anti-virus products are detecting the current variant of Petya on this VirusTotal page. I’ve linked to one of the files involved in the infection. The page shows which AV vendors are currently detecting this file. The green check marks mean the file is not detected by that AV vendor (it’s counterintuitive).

Who This Has Affected So Far

  • A Ukrainian state power company and Kiev’s main airport were among the first to report issues.
  • The Chernobyl nuclear power plant has had to monitor radiation levels manually after they were forced to shut down the Windows systems that their sensors had been using.
  • Antonov aircraft has reported being affected.
  • Copenhagen-based shipping company Maersk is experiencing outages in multiple IT systems and across multiple business units.
  • Food giant Modelez, which makes Oreo and Toblerone, has also been hit.
  • Netherlands-based shipping company TNT was also hit.
  • French construction company St. Gobain has been affected.
  • Pharmaceutical company Merck says they have systems affected.
  • Law firm DLA Piper was hit.
  • Heritage Valley Health System, a US hospital operator, has also been hit.
  • Kiev’s metro system has stopped accepting payment cards because they were affected.

The list is long and growing; the above just a snapshot.

Strong Incentive for Attackers

Many are reporting the belief that the South Korean hosting company that paid attackers a $1M ransom a week ago to recover their data have created a huge incentive for future ransomware attacks.

That has resulted in this new spate of attacks affecting systems globally.

Coverage of This Story

Help Keep the Community Safe

We recommend you let your friends and family know about this fast spreading campaign as a matter or urgency to help them stay safe.

Story originally posted on wordfence.com