[menog] WannaCry Ransomware
KHALID SAMARA
pc-chair at menog.org
Wed May 24 15:12:37 UTC 2017
Dears,
Following on the below discussion below ; I would like to add some related information about this ransomware attack in several emails ;
first , as many of you may be know that WCry or WannaCry maleware exploits a Windows SMB vulnerability to enable propagation after having established a foothold in an environment or also even through malicious links in spam messages.
This propagation mechanism can distribute the malware both within the compromised network & over the public internet ; and the exploit used here codenamed “EternalBlue”; however this exploited vulnerability, was patched in Microsoft MS17-010.
The malware usually add an encrypted data files with the WCRY extension; also it used to drop & execute a decryptor, then demands $300 that should be paid in Bitcoins to decrypt the data; If the user doesn’t pay the ransom within three days, the amount doubles to $600; after seven days without payment, WannaCry will delete all of the encrypted files and all data will be lost!
Below some of the filetypes that are targeted and encrypted by WannaCry:
3g2.3gp.accdb.aes.ai.asc.asf.asm.asp.avi.backup.bak.at.bmp.brd.bz2.cgm.class.cmd.cpp.crt.cs.csr.csv.db.dbf.dch.dif.dip.djvu.doc.docb.docm.docx.dot.dotm.dotx.dwg.edb.eml.fla.flv.frm.gif.gpg.gz.hwp.ibd.iso.jar.java.jpeg.jpg.js.jsp.key.lay.lay6.
mdb.mdf.mid.mkv.mml.mov.mp3.mp4.mpeg.mpg.msg.myd.myi.nef.odb.pas.pdf.pem.pfx.php.pl.png.pot.potm.potx.ppam.pps.ppsm.ppsx.ppt.pptm.pptx.ps1.psd.pst.rar.raw.rb.rtf.sch.sh.sldm.sldx.slk.sln..swf.sxc.sxd.sxi.sxm.sxw.tar.tbk.tgz.tif.tiff.txt.uot.vb.vbs.vcd.vdi.vmdk.vmx.vob.vsd.wav.wb2.wk1.zip
This malware uses encrypted Tor channels for command and control communications; trying to query for :-
ayylmaotjhsstasdfasdfasdfasdfasdfasdfasdf[.]com
And sometimes to (www.ifferfsodp9ifjaposdfjhgosurijfaewrwergwea[.]test<http://www.ifferfsodp9ifjaposdfjhgosurijfaewrwergwea[.]test/>.) etc..
If it cannot contact this domain files or if it cannot make a HTTP request to the resolution of the mentioned domain then the malware will start to encrypt files.
However and as workaround to this issue; network administrators can locally sinkhole this domains or other domains by adding A-record to their DNS server and then translate this domain to any of the existing sinkhole IPs.
This malware enumerates the network adapters and determines which subnets the system is on. then malware then generates a thread for each IP on the subnet. Each of these threads attempt to connect to the IP on TCP port 445 and, if successful, attempt exploitation of the system using the EternalBlue SMB exploit.
However; below some of indicators of compromise could be used to identify potentially WnnCry activity :-
MD5s related samples:
29365f675b69ffa0ec17ad00649ce026
2b4e8612d9f8cdcf520a8b2e42779ffa
2ca9ea7966269b22b5257f7a41817e1f
Related URLs:
iuqssfsodp9ifjaposdfjhgosurijfaewrwergwea[.]com
ifferfsodp9ifjaposdfjhgosurijfaewrwergwea[.]com
iuqerfsodp9ifjaposdfjhgosurijfaewrwergwea[.]com
Related Tor Sites:
cwwnhwhlz52maqm7[.]onion; gx7ekbenv2riucmf[.]onion ; sqjolphimrr7jqw6[.]onion
Related Executables:
C:\Windows\mssecsvc.exe ; C:\Windows\tasksche.exe
Related Processes Started:
cscript.exe //nologo m.vbs
There is no confirmed fix for WannaCry available at this time. Antimalware companies and antivirus companies are trying to find a way to decrypt files on infected computers, but currently still now no way available now to do that .
Regards,
khalid
----------------------------------------------------------------------
Message: 1
Date: Sat, 20 May 2017 17:32:52 +0300
From: Harith Dawood <alwathiq2007 at gmail.com>
Subject: Re: [menog] WannaCry Ransomware
To: Hisham Ibrahim <hmi at ripe.net>
Cc: MENOG <menog at menog.org>
Message-ID:
<CAH3nW1+xmhpqGEz2Cn_ivs_ro2Ynz+wrzugqo=0eLd82+PXUUA at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
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/
> editor/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.
>
>
>
>
> _______________________________________________
> Menog mailing list
> Menog at lists.menog.org
> http://lists.menog.org/mailman/listinfo/menog
>
>
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Message: 2
Date: Sat, 20 May 2017 20:26:33 +0400
From: Luqman Kondeth <luqman.kondeth at nyu.edu>
Subject: Re: [menog] WannaCry Ransomware
To: Harith Dawood <alwathiq2007 at gmail.com>
Cc: Hisham Ibrahim <hmi at ripe.net>, MENOG <menog at menog.org>
Message-ID:
<CAP32F_zAK5shpB4Dx6ptS3OREtUX-UwnVPtf4paaRsNSgH_-iw at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
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
192.168.0.2
100.100.129.90
149.236.99.1
172.18.4.200
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.
Thanks
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.
>>
>>
>>
>>
>> _______________________________________________
>> Menog mailing list
>> Menog at lists.menog.org
>> http://lists.menog.org/mailman/listinfo/menog
>>
>>
>
> _______________________________________________
> Menog mailing list
> Menog at lists.menog.org
> http://lists.menog.org/mailman/listinfo/menog
>
>
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