What do we know about the infection?

There have been several early reports on this particular infection, and Trend Micro is trying to validate these sources independently to ensure their accuracy.

It appears that BadRabbit spreads via fake Flash updates, incorporates the use of Mimikatz to extract credentials (an open source tool that has been used in previous attacks), and is apparently trying using a list of common hard-coded credentials such as Admin, Guest, User, root, etc. There is evidence to also support that the BadRabbit ransomware is using a legitimate tool — DiskCryptor — for encryption of victim’s systems.

There is also some evidence pointing to BadRabbit using the “EternalBlue” exploit to spread.

What steps do I need to take to reduce the risk of infection?

As early analysis indicates that new threat may be similar to and/or related to Petya, Trend Micro recommends that customer implement the following best practices as a bare minimum:

  • Patch and update your systems, or consider a virtual patching solution.
  • Enable your firewalls as well as intrusion detection and prevention systems.
  • Proactively monitor and validate traffic going in and out of the network.
  • Implement security mechanisms for other points of entry attackers can use, such as email and websites.
  • Deploy application control to prevent suspicious files from executing on top of behavior monitoring that can thwart unwanted modifications to the system.
  • Employ data categorization and network segmentation to mitigate further exposure and damage to data.
  • Disable SMB (v1) on vulnerable machines – using either GPO or by following the instructions provided by Microsoft.
  • Ensure that all of the latest patches (if possible using Virtual Patching solution) are applied to affected operating systems – especially the ones related to MS17-010 and any recent urgent security bulletins.

Protect your organization using Trend Micro Products

Trend Micro recommends a layered security approach on endpoint, messaging, and gateway, to ensure that all potential entry and compromise points have protection against these types of threats:

  • Trend Micro Predictive Machine Learning (found in products such as OfficeScan XG) detects the ransomware threat as TROJ.Win32.TRX.XXPE002FF019.
  • Trend Micro Web Reputation Services (WRS) is already classifying the reported Flash URL vector as malicious in products that utilize this feature.
  • Trend Micro Deep Discovery Analyzer (DDAN) is currently detecting parts of this threat as VAN_FILE_INFECTOR.UMXX.
  • Smart Scan Agent Pattern and Official Pattern Release: Trend Micro is in the process of adding known variant and component detections into its patterns.
    • Smart Scan Pattern (TBL) – Currently being detected as Ransom_BADRABBIT.A starting with patterns 17594.019.00 and 17594.020.00
    • Smart Scan Agent Pattern and Official Pattern Release (conventional) – Currently being added as Ransom_BADRABBIT.A, Ransom_BADRABBIT.SMA, and Ransom_BADRABBIT.A into pattern 13.739.00
    Please note that these patterns are the minimum recommended ones that contain protection for this threat — however, due to new components and variants being discovered it is important that customers ALWAYS obtain the latest pattern files to ensure up-to-date protection.  Also note that the minimum Scan Engine version needed for protection with the above patterns is 9.8x.
 
The following protection information listed below was specifically recommended for the recent PetYa outbreak. Since there is evidence that BadRabbit is utilizing similar components, the following protections against some of the underlying vulnerabilities may still be very relevant.
  • Trend Micro Deep Security and Vulnerability Protection (formerly the IDF plug-in for OfficeScan) customers that have the latest IPS rules may already have an updated layer of Virtual Patching protection for multiple Windows operating systems, including some that have reached end-of-support (XP, 2000, 2003) based on early reports that “EternalBlue” is one of the primary infection vectors. Specifically, Trend Micro released the following IPS rules for proactive protection against MS17-010 if you have not already applied Microsoft’s recommended patches:
    • Rules 1008224, 1008225, 1008228, 1008285, and 1008306  – Includes coverage for MS17-010 and some specific protection against Windows SMB remote code execution vulnerabilities
    • In addition, the following rules may help to prevent potential lateral movement of the ransomware using PsExec: 10032221006906, 1008327, 1008328, 1008422, and 1008423. Please note however, that some of these rules are not automatically enabled by the recommendation scan engine (default setting of the rule is “Detect-only”) and should be switched to “Prevent” mode based on whether these are feasible for your environment (see the screenshot below for more information).Deep Security Prevent
  • Trend Micro Deep Discovery Inspector customers with the latest rules may also have an additional layer of protection against the vulnerabilities associated with the “EternalBlue” exploit. Specifically, Trend Micro has released the following official rule for proactive protection:
    • DDI Rule 2383: CVE-2017-0144 – Remote Code Execution – SMB (Request)
    • DDI Rule 2441 – PsExec PETYA – Ransomware – SMB
    • In addition, the following rules help monitor potential lateral movement of PsExec:  DDI Rules 35 and 1307
  • Trend Micro TippingPoint customers with the following filters may also have updated protection against “EternalBlue” (however, we are still researching infection and propagation vectors and will provide updates to this information as needed):
    • Mainline Filters 27931 and 27928 – Includes coverage for MS17-010 and some specific protection against Windows SMB remote code execution vulnerabilities and attacks
    • Digital Vaccine (DV) Filter 28471 – May be configured to enforce generic policy at the network perimeter by blocking SMB v1 traffic (this is disabled by default).
  • Trend Micro Endpoint Application Control (EAC) administrators utilizing the product’s “Lockdown” mode – which allows only pre-specified applications to run – also provides protection against this threat.

Trend Micro highly recommends that vendor critical patches are applied as soon as possible upon release. Customers and partners who may need some additional information or have questions are encouraged to contact their authorized Trend Micro technical support representative for further assistance.

Additional Information

Below is additional technical information on the known variants and components of this ransomware attack:

Trend Micro Blogs (BadRabbit and PetYa Related)

3rd Party Information

 

Fonte: Trend Micro