Trustwave SpiderLabs Uncovers Ov3r_Stealer Malware Spread via Phishing and Facebook Advertising. Learn More

Trustwave SpiderLabs Uncovers Ov3r_Stealer Malware Spread via Phishing and Facebook Advertising. Learn More

Services
Capture
Managed Detection & Response

Eliminate active threats with 24/7 threat detection, investigation, and response.

twi-managed-portal-color
Co-Managed SOC (SIEM)

Maximize your SIEM investment, stop alert fatigue, and enhance your team with hybrid security operations support.

twi-briefcase-color-svg
Advisory & Diagnostics

Advance your cybersecurity program and get expert guidance where you need it most.

tw-laptop-data
Penetration Testing

Test your physical locations and IT infrastructure to shore up weaknesses before exploitation.

twi-database-color-svg
Database Security

Prevent unauthorized access and exceed compliance requirements.

twi-email-color-svg
Email Security

Stop email threats others miss and secure your organization against the #1 ransomware attack vector.

tw-officer
Digital Forensics & Incident Response

Prepare for the inevitable with 24/7 global breach response in-region and available on-site.

tw-network
Firewall & Technology Management

Mitigate risk of a cyberattack with 24/7 incident and health monitoring and the latest threat intelligence.

Solutions
BY TOPIC
Microsoft Exchange Server Attacks
Stay protected against emerging threats
Rapidly Secure New Environments
Security for rapid response situations
Securing the Cloud
Safely navigate and stay protected
Securing the IoT Landscape
Test, monitor and secure network objects
Why Trustwave
About Us
Awards and Accolades
Trustwave SpiderLabs Team
Trustwave Fusion Security Operations Platform
Trustwave Security Colony
Partners
Technology Alliance Partners
Key alliances who align and support our ecosystem of security offerings
Trustwave PartnerOne Program
Join forces with Trustwave to protect against the most advance cybersecurity threats
SpiderLabs Blog

Worm Propagates Through Skype Messages

For the past week, we've received a lot of reports of a worm that propagates through Skype known as Dorkbot. This is probably nothing new for most of you -but still it pays to be aware. Anyway, I got hold of a sample and took a closer look. The worm usually arrives as a link from a friend's Skype instant message telling you how funny your profile pics are.

12662_f33110c6-e7bd-4758-bf70-2f57cbe4e666

Clicking the link, prompts the user to download a file hosted at Sendspace.com:

11588_c0a71009-dcd1-4242-bd34-6cdf13f35153
For the sake of science, we extracted the zip file and run it in our test environment, and of course, as we suspected this was the Skype worm itself. During testing we left Skype with fake user ID running in the background.

When run, the malware first obtained our infected host's IP address and location by cleverly querying it from a free GeoIP web service, Wipmania.com. It then sends this data back to one of the following control servers on port 1863:

  • 217.160.108.147
  • 176.9.192.131
  • 87.255.51.229 <- now sinkholed by abuse.ch

It then downloads additional malware hosted at Hotfile.com. I have also seen reports of ransomware downloaded and installed on the infected system:

9121_4ad28d8c-ebb3-47d5-a0eb-d205cf68852cA

Not long after it downloaded the additional malware, it started spamming our Skype contacts with the same message that we got.

There are also other serious payloads for this malware: it also steals user credentials from various websites (as you can see in the screenshot below, those are the strings that the malware monitors). The malware is also capable of propagating through MSN and USB flash drives.

11303_b272b99c-8f41-451c-a532-dfc50390eadf

As always, be wary of whatever link has been sent to you and avoid clicking it if you are not sure of what it is. Trustwave SWG customers are protected against this threat.

Latest SpiderLabs Blogs

Welcome to Adventures in Cybersecurity: The Defender Series

I’m happy to say I’m done chasing Microsoft certifications (AZ104/AZ500/SC100), and as a result, I’ve had the time to put some effort into a blog series that hopefully will entertain and inform you...

Read More

Trustwave SpiderLabs: Insights and Solutions to Defend Educational Institutions Against Cyber Threats

Security teams responsible for defending educational institutions at higher education and primary school levels often find themselves facing harsh lessons from threat actors who exploit the numerous...

Read More

Breakdown of Tycoon Phishing-as-a-Service System

Just weeks after Trustwave SpiderLabs reported on the Greatness phishing-as-a-service (PaaS) framework, SpiderLabs’ Email Security team is tracking another PaaS called Tycoon Group.

Read More