New ransomware attack hits Ukraine … may be global in scope

Numerous reports are coming out on social media about a new ransomware attack in Ukraine, which could be related to the Petya family.

Update (June 28 – 15:00 CEST): ESET researchers have confirmed that further affected systems had access to Ukraine networks through VPN. Presently, it has not been seen in the malware a functionality to spread outside of the LAN network. Update (June 27 – 23.34 CEST): Shutting down the computer and not booting again could prevent the disk encryption, though several files can be already encrypted after the MBR is replaced and further infection through the network is attempted. Update (June 27 – 22.28 CEST): Paying is no longer possible as the email to send the Bitcoin wallet ID and “personal installation key” has been shut down by the provider. Thus, people shouldn’t pay for the ransom as they will not be able to receive the decryption key.
Update (June 27 – 21.20 CEST): ESET researchers have located the point from which this global epidemic has all started. Attackers have successfully compromised the accounting software M.E.Doc, popular across various industries in Ukraine, including financial institutions. Several of them executed a trojanized update of M.E.Doc, which allowed attackers to launch the massive ransomware campaign today which spread across the whole country and the rest of the world. M.E.Doc has today released a warning on its website.

Numerous reports are coming out on social media about a new ransomware attack in Ukraine, which could be related to the Petya family (subsequently being referred to as NotPetya and ExPetya, due to its particularly unique characteristics), which is currently detected by ESET as Win32/Diskcoder.C Trojan. If it successfully infects the MBR, it will encrypt the whole drive itself. Otherwise, it encrypts all files, like Mischa.

For spreading, it appears to be using a combination of the SMB exploit (EternalBlue) used by WannaCryptor for getting inside the network, then spreading through PsExec for spreading within the network.

This dangerous combination may be the reason why this outbreak has spread globally and rapidly, even after the previous outbreaks have generated media headlines and hopefully most vulnerabilities have been patched. It only takes one unpatched computer to get inside the network, and the malware can get administrator rights and spread to other computers.

It stated: “Currently, the financial sector strengthened security measures and counter hacker attacks all financial market participants.”

“If you see this text, then your files are no longer accessible, because they have been encrypted … We guarantee that you can recover all your files safely and easily. All you need to do is submit the payment [$300 bitcoins] and purchase the decryption key.”

However, a spokesman said that “there is no effect on power supplies”, although it may be too early to ascertain this.

On the latter’s homepage, the following message reads: “The WPP web site is currently unavailable due to important routine maintenance normal service will resume shortly.

“We apologise for any inconvenience this may cause. In the meantime if you would like to contact WPP, please email the site Editor at the following address …”

There are also reports that payments are being made in response to the attack, at the BTC address linked here.

For more on Petya, check out this insightful piece from 2016, which notes of the crypto-ransomware:

Petya took an approach different from that of other crypto-ransomware. Instead of encrypting files individually, it aimed at the file system.

“The target is the victim’s master boot record (MBR), which is responsible for loading the operating system right after system boot.”

In order to prevent this kind of threat, we recommend that you read our support article and keep in mind the following steps:

  1. Always have your systems fully patched
  2. Use a proper security solution
  3. Do not use the same account/credentials for workstations and server administration
  4. Disable default ADMIN$ or communication to admin shares – users can use ESET Smart Security for home and ESET Endpoint Security 6+ for business where network attack protection is present (Option: IDS and advanced options->allow incoming connections to admin shares in SMB)
  5. Disable SMB1 when possible – issues with XP, 2003 that do not know SMB2+

This is currently a breaking story. Further updates to come, as listed above. For a snapshot of recent major ransomware attacks and what else to do, see the infographic below:

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