2018-01-03 - URSNIF INFECTION

NOTICE:

• The zip archives on this page have been updated, and they now use the new password scheme.  For the new password, see the "about" page of this website.

ASSOCIATED FILES:

• 2018-01-03-Ursnif-infection-traffic.pcap.zip   173.1 kB (173,085 bytes)

• 2018-01-03-Ursnif-infection-traffic.pcap   (258,533 bytes)

• 2018-01-03-Ursnif-email-and-malware.zip   149.1 kB (149,055 bytes)

• 2018-01-02-Ursnif-malspam-2300-UTC.eml   (75,797 bytes)
• 2018-01-02-malspam-attachment-Invoice_INV-6183092.doc   (53,760 bytes)
• 2018-01-03-dutox.exe   (115,200 bytes)
• 2018-01-03-uvcmarm.bat.txt   (332 bytes)

NOTES:

• Received confirmation this is Ursnif (version 3) from @malwareforme.

Shown above:  Thanks, Jack!

 

WEB TRAFFIC BLOCK LIST

Indicators are not a block list.  If you feel the need to block web traffic, I suggest the following URLs and domain:

• hxxp[:]//37.59.50[.]189/docs/scan001.jpeg
• hxxp[:]//94.23.204[.]222/docs/scan001.jpeg

 

EMAIL

Shown above:  Screenshot of the email.

 

EMAIL INFORMATION:

• Date:  Tuesday, 2018-01-02 at 23:00 UTC
• Subject:  Your Xero Invoice INV-6183092
• From:  "Xero Billing Notifications" <subscription.notifications@xeroservice.com>
• Attachment name:  Invoice INV-6183092.doc

 

Shown above:  Attached Word document from the email with malicious macro.

 

TRAFFIC

Shown above:  Initial infection traffic filtered in Wireshark.

 

ASSOCIATED TRAFFIC:

• 37.59.50[.]189 port 80 - 37.59.50[.]189 - GET /docs/scan001.jpeg - 404 not found
• 94.23.204[.]222 port 80 - 94.23.204[.]222 - GET /docs/scan001.jpeg - returned an EXE file
• 203.24.188[.]166 port 443 - SSL/TLS traffic with demo Certificate Authority (CA) for Internet Widgets Pty Ltd (no HTTPS server name)

 

MALWARE

WORD DOCUMENT FROM THE MALSPAM:

• SHA256 hash:  5a143b5fbd2d19465b5484262af09e8b35c52b447542b906811fd61bf0a113a8
  File size:  53,760 bytes
  File name:  Invoice INV-6183092.doc

URSNIF EXECUTABLE RETRIEVED AFTER ENABLING THE WORD DOCUMENT MACROS:

• SHA256 hash:  eb07dbeefb5a3c7df542bcc268bb3d230f0ce6888732b183bb3303308759ae85
  File size:  115,200 bytes
  File location:  hxxp[:]//94.23.204[.]222/docs/scan001.jpeg
  File location:  C:\Users\[username]\AppData\Local\Temp\dutox.exe

 

IMAGES

Shown above:  HTTP request and response for the malicious executable.

 

Shown above:  Ursnif post-infection SSL/TLS traffic.

 

Shown above:  Alerts from Sguil in Security Onion using Suricata and the EmergingThreats Pro (ETPRO) ruleset.

 

Shown above:  Malicious executable and associated batch file on the infected host.

 

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