[menog] WannaCry Ransomware

Luqman Kondeth luqman.kondeth at nyu.edu
Sat May 20 16:26:33 UTC 2017

Has anyone been able to observe the malware network behavoiur in action ?
I ask this because we noticed large amounts of tcp port scans on 445 from
the 12th which is when the malware was reported.
What is interesting however is that the machines that were doing this in
our network were Apple Macs.  Is it possible that the Macs are a carrier
for the worm ? Anyone seen anything similar?

We also noticed the following

There is increased amount of traffic on port 445 and 139 from the 12th of
this month.
We also see certain IP addresses being constantly probed on port 445
The below are the IP addresses

The pattern we see is usually a connection attempt on port 445 to one of
the above ports followed by a large number of 445 traffic to random IPs.


On 20 May 2017 6:33 p.m., "Harith Dawood" <alwathiq2007 at gmail.com> wrote:

> Dear Mr. Hisham Ibrahim
> Thank you very much for your important information.
> Best regards;
> Harith
> On Mon, May 15, 2017 at 12:42 AM, Hisham Ibrahim <hmi at ripe.net> wrote:
>> Dear All,
>> As you are no doubt aware, we are currently experiencing an unprecedented
>> ransomware attack at a global scale. The malware was detected on 12 May
>> 2017 and has the capability to spread across networks taking advantage of a
>> critical exploit in a popular communication protocol used by Windows
>> systems.
>> Many of you have already reached out and are actively involved in
>> containing this threat. It is believed that the infection and propagation
>> rate may go up on Monday when people return to their workplaces.
>> Below is the Europol warning / update about the current ransomware
>> threat. If you think this would be useful to anyone in our community,
>> please forward it on.
>> A list of tips and advice on how to prevent ransomware from infecting
>> your electronic devices can be found at:
>> https://www.europol.europa.eu/sites/default/files/images/edi
>> tor/ransomware-01.jpg
>> Regards,
>> Hisham
>> Begin forwarded message:
>> *If you are a victim or have reason to believe that you could be a victim*
>> This is link provides some practical advice on how to contain the
>> propagation of this type of ransomware:
>> *https://www.ncsc.gov.uk/guidance/ransomware-latest-ncsc-guidance*
>> <https://www.ncsc.gov.uk/guidance/ransomware-latest-ncsc-guidance>
>> The most important step involves patching the Microsoft vulnerability
>> (MS17-010):
>> *https://technet.microsoft.com/en-us/library/security/ms17-010.aspx*
>> <https://technet.microsoft.com/en-us/library/security/ms17-010.aspx>
>> A patch for legacy platforms is available here:
>> *https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks*
>> <https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks>
>> In instances where it is not possible to install the patch, manage the
>> vulnerability becomes key. One way of doing this would be to disable the
>> SMBv1 (Server Message Block) protocol:
>> *https://support.microsoft.com/en-us/help/2696547*
>> <https://support.microsoft.com/en-us/help/2696547>
>> and/or block SMBv1 ports on network devices [UDP 137, 138 and TCP 139,
>> 445].
>> Another step would be to update endpoint security and AV solutions with
>> the relevant hashes of the ransomware (e.g. via VirusTotal).
>> If these steps are not possible, not starting up and/or shutting down
>> vulnerable systems can also prevent the propagation of this threat.
>> *How to prevent a ransomware attack?*
>>    1. *Back-up! Back-up! Back-up!* Have a backup and recovery system in
>>    place so a ransomware infection can’t destroy your personal data forever.
>>    It’s best to create at least two back-up copies on a regular basis: one to
>>    be stored in the cloud (remember to use a service that makes an automatic
>>    backup of your files) and one stored locally (portable hard drive, thumb
>>    drive, etc.). Disconnect these when you are done and store them separately
>>    from your computer. Your back-up copies will also come in handy should you
>>    accidentally delete a critical file or experience a hard drive failure.
>>    2. *Use robust antivirus software* to protect your system from
>>    ransomware. Always use the latest virus definition/database and do not
>>    switch off the ‘heuristic’ functions as these help the solution to catch
>>    samples of ransomware (and other type of malware) that have not yet been
>>    formally detected.
>>    3. *Keep all the software on your computer up to date.* When your
>>    operating system (OS) or applications release a new version, install it. If
>>    the software you use offers the option of automatic updating, enable it.
>>    4. *Trust no one. Literally.* Any account can be compromised and
>>    malicious links can be sent from the accounts of friends on social media,
>>    colleagues or an *online gaming*
>>    <https://blog.kaspersky.com/teslacrypt-20-ransomware/9314/> partner.
>>    Never open attachments in emails from someone you don’t know. Similarly,
>>    don’t open attachments in emails from somebody you know but from whom you
>>    would not expect to receive such as message. Cybercriminals often
>>    distribute fake email messages that look very much like email notifications
>>    from an online store, a bank, the police, a court or a tax collection
>>    agency, luring recipients into clicking on a malicious link and releasing
>>    the malware into their system. If in doubt, call the sender at a trusted
>>    phone number to confirm the legitimacy of the message received.
>>    5. *Enable the ‘Show file extensions’ option in the Windows settings
>>    on your computer.* This will make it much easier to spot potentially
>>    malicious files. Stay away from file extensions like ‘.exe’, ‘.com’, ‘.vbs’
>>    or ‘.scr’. Cybercriminals can use several extensions to disguise a
>>    malicious file as a video, photo, or document (like hot-chics.avi.exe or
>>    report.doc.scr).
>>    6. If you discover a rogue or unknown process on your machine, *disconnect
>>    it immediately from the internet or other network connections (such as home
>>    Wi-Fi)* — this will prevent the infection from spreading.
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