Category: SMB vulnerability

Ways to protect your computers from Petya Ransomware

Some CERT recommendations to better protect your computers from becoming infected by Petya Ransomware:

    • Perform regular backups of all critical information to limit the impact of data or system loss and to help expedite the recovery process. Ideally, this data should be kept on a separate device, and backups should be stored offline.
    • Applocker policies to block execution of files having name perfc.dat as well as psexec.exe utility from sysinternals.
    • Don’t open attachments in unsolicited e-mails, even if they come from people in your contact list, and never click on a URL contained in an unsolicited e-mail, even if the link seems benign. In cases of genuine URLs close out the e-mail and go to the organization’s website directly through browser.
    • Restrict execution of powershell /WSCRIPT/ PSEXEC / WMIC in enterprise environment Ensure installation and use of the latest version (currently v5.0) of PowerShell, with enhanced logging enabled. script block logging, and transcription enabled. Send the associated logs to a centralized log repository for monitoring and analysis.
    • Establish a Sender Policy Framework (SPF),Domain Message Authentication Reporting and Conformance (DMARC), and DomainKeys Identified Mail (DKIM) for your domain, which is an email validation system designed to prevent spam by detecting email spoofing by which most of the ransomware samples successfully reaches the corporate email boxes.
    • Application whitelisting/Strict implementation of Software Restriction Policies (SRP) to block binaries running from %APPDATA%, %PROGRAMDATA% and %TEMP% paths. Ransomware sample drops and executes generally from these locations. Enforce application whitelisting on all endpoint workstations.
    • Deploy web and email filters on the network. Configure these devices to scan for known bad domains, sources, and addresses; block these before receiving and downloading messages. Scan all emails, attachments, and downloads both on the host and at the mail gateway with a reputable antivirus solution.
    • Disable macros in Microsoft Office products. Some Office products allow for the disabling of macros that originate from outside of an organization and can provide a hybrid approach when the organization depends on the legitimate use of macros. For Windows, specific settings can block macros originating from the Internet from running.
    • Configure access controls including file, directory, and network share permissions with least privilege in mind. If a user only needs to read specific files, they should not have write access to those files, directories, or shares.
    • Disable remote Desktop Connections, employ least-privileged accounts.

Click on this link to view the prior coverage about WannaCry Ransomware found on Uniquely Toronto.

Posted by Vincent Banial

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CERT had issued Vulnerability Note VU#867968 advising about the SMB vulnerability in Microsoft Windows

WannaCry Ransomware seems to have appeared out of the blue. Because of it thousands of people have searched the internet to find out how to disable SMB on their Microsoft Windows based Servers and Workstations and Personal Computers. Thousands had dropped by Uniquely Toronto to read out posts which provided details on ways to disable SMB v1.0.

Now Adylkuzz is running another major attack which is underway and uses the SMB vulnerability in Windows.

There was a prior Cert advisory titled: “Vulnerability Note VU#867968” (Microsoft Windows SMB Tree Connect Response denial of service vulnerability) was issued on Feb 02 2017.

In March Microsoft issued their Microsoft Security Bulletin MS17-012 which addressed the SMB issue.

There was also an even earlier US-CERT Advisory posted on Jan 16 2017 titled: “SMB Security Best Practices”, which suggested “blocking outbound SMB connections (TCP ports 139 and 445 along with UDP ports 137 and 138) from the local network to the WAN. “. Port blocking can be done using your Firewall Software (or Hardware)

“US-CERT cautions users and administrators that disabling or blocking SMB may create problems by obstructing access to shared files, data, or devices. The benefits of mitigation should be weighed against potential disruptions to users. For more information on SMB, please review Microsoft Security Advisories 2696547 (link is external) and 204279 (link is external).”

Microsoft Windows MS17-010 Security Update: https://technet.microsoft.com/en-us/library/security/ms17-010.aspx.

Click on this link to view other CyberSecurity related posts found on Uniquely Toronto.

Posted by Vincent Banial

Disclaimer: Everything in the post above is subject to change without notice. There could be unintentional errors. Please confirm all info via the linked to websites and web pages. Please install the Microsoft Windows MS17-010 Security Update (see link above). Best Practice is to also always create daily backups

Massive Adylkuzz attack is underway which uses the same tools used by WannaCry

New Adylkuzz Malware attack uses the same tools which were used by WannaCry Ransomware – (EternalBlue for instance) which were released by The Shadow Brokers back in April. Eternal Blue code scans a network to find computers running the Microsoft SMB v1.0 protocol service (open TCP ports 139 and 445 along with UDP ports 137 and 138). When found it can then install the malware.  Adylkuzz is infecting thousands of computers around the Globe. Microsoft released a Security patch back in March which addressed the SMB vulnerability. Last week Microsoft also released further Windows Security Patches for Windows systems going back to Windows XP.  Microsoft’s Windows Security Updates will stop the spread of WannaCry and Adulkuzz, once the Security Patches have been installed and the system rebooted. At the bottom of this post, you will find links to the official Microsoft Patches.

Video is courtesy of the DAHBOO77 YouTUbe channel

This new AdylKuzz Malware does not request any ransom from the owner of the infected computer. It does it’s processing in the background. One interesting aspect about the way that Adylkuzz works is that once it infects a computer it then disables the SMB v1.0 protocol. That move prevents any other Malware from infecting the computer. Adylkuzz may very well have protected thousands of computers around the globe from becoming infected by WannaCry Ransomware because Adylkuzz it is believed has been running in the wild on the internet for many weeks and before the WannaCry attack was launched.

Click on this Link to visit the PHYS.Org website to read their post titled: “Another large-scale cyberattack underway: experts”.

Adylkuzz essentially is a Cryptocurrency Miner. Apparently, it is being reported that Adylkuzz does not damage any files. A lot of people use their powerful computers to do Cryptocurrency Mining. Cryptocurrency like Monero and Bitcoin is essentially untraceable Internet money which can be converted to a National Currency or used directly on the Internet. Adylkuzz mines the Monero Cryptocurrency. Once installed on the infected computer it will start to use computer resources. On an older slow PC, the end user will notice a dramatic slowdown. On a Top End fast PC there will be a far less noticeable slowdown. What will be dramatically affected, will be one’s useable internet bandwidth. Downloads and even web page loading will take longer. Watching internet videos will be affected with slowdowns.

To prevent being infected by either WannaCry or Adylkuzz one needs to make sure that any Microsoft Windows Security Updates have been installed. Yes, one can manually disable the SMB v1.0 protocol on a PC, but the Microsoft Security Patches also patch other holes and vulnerabilities in the Windows Operating Systems. Install the Windows Security Patches. Also make sure to Update any and all of your Computer Security software like your Firewall, Anti-Virus, and Anti-Malware software. Then consider buying an external hard drive (if you do not already have one) and start backing up your data. Having a daily Backup of your data files costs far less than having to pay Ransomware, should your PC become infected.

Click on the following like to visit the Proofpoint cybewrsecurity firm’s post titled: “Adylkuzz Cryptocurrency Mining Malware Spreading for Weeks Via EternalBlue/DoublePulsar”.

Click on this Link to visit the Symantec Security Response blog to read their post titled: “Adylkuzz Cryptocurrency Miner Is Not The Next WannaCry”.

Click on this Link to visit the news.com.au site to read their post titled: “New Adylkuzz cyberattack targeted at mining virtual currency in infected computers”.

Click on this Link to visit the RT website to read their post titled: “WannaCry XXL? 2nd even bigger global cyber attack already underway”.

The following was posted by Anonymous on their YouTube channel TORnado – Anonymous France. Permission to share was posted on their YouTube channel along with the video linked to below,:
“Published on May 17, 2017

Greetings citizens of the world,

We are Anonymous.

This is a new warning about a massive hack.
Following the attack “WannaCry Ransomware”, a much larger hack was discovered.

Much more vicious, better hidden and bringing much more money to black-hats hackers, this massive virus is called “Adylkuzz” and simply uses the same flaw as WannaCry.
This is once again a computer tool stolen from the NSA.
But this time it is not your data that is affected but your entire computer that through the rat, will become a minor zombie of crypto-currency.

For the moment of what we, Anonymous know, here is the process:

The virus enters the computer with DoublePulsar and EternalBlue, via the MS17-010 fault on the TCP port 445 as the previous “WannaCryptor” but there will be nothing on the screen. You will not even know that you are infected.

Then the hack will begin to mining the cryptomony with your machine, ie you will produce virtual currency of type “Monero”, similar to the famous bitcoin without
You know it and free for hackers you do not know.
Knowing that the mining uses the abilities of the PC, the victim then undergoes slowdowns which causes a malfunction of the computer.

Several hundred thousand people would already be in this case, that’s why we’re alerting you once again. It seems that “WannaCry” was only the part of the iceberg, stay alert, update your Windows and keep your antivirus.

On our side we follow different tracks to find these hackers. Already about 40,000 dollars in Monero have recently been discovered probably the money gained through the hack.

The cryptomontee is thus once again likely to have a bad image in the media whereas this currency remains a practical and anonymous means to buy or give money.

Now calls to the Anonymous, it’s time to stop these criminals and help those affected or not knowing how to protect themselves.
The NSA can not even protect its own data, so we can only count on ourselves.
In any event,

We’re Anonymous,
We are Legion,
We do not forget,
We do not forgive,
Rogues, thieves, whoever you are,
Expect us.

————————————-“

The video below, by Anonymous, is the above info but spoken in French.
Video is courtesy of the TORnado – Anonymous France YouTube channel

The following are LINKS to Official Microsoft Patches for assorted versions of Windows (including Windows XP). Download English language security updates:

Windows Server 2003 SP2 x64,

Windows Server 2003 SP2 x86,

Windows XP SP2 x64,

Windows XP SP3 x86,

Windows XP Embedded SP3 x86,

Windows 8 x86,

Windows 8 x64

To download localized versions for the security update for Windows XP, Windows 8 or Windows Server: http://www.catalog.update.microsoft.com/Search.aspx?q=KB4012598

Microsoft Windows MS17-010 Security Update: https://technet.microsoft.com/en-us/library/security/ms17-010.aspx.

Click on this link to view other CyberSecurity related posts found on Uniquely Toronto.

Posted by Vincent Banial

Disclaimer: Everything in the post above is subject to change without notice. There could be unintentional errors. Please confirm all info via the linked to websites and web pages. Best Practice is to always create daily backups