Bank-targeting malware disguises itself as video conferencing software

IBM says the Vizom malware is spreading through spam-based phishing campaigns

Red skull and crossbones atop binary code

IBM Security researchers have discovered a new form of malware targeting online banking users in Brazil.

Dubbed Vizom, the malware disguises itself as popular video conferencing software and uses convincing remote overlays to take over user devices in real-time.

Research shows that hackers are delivering the malware via spam-based phishing email campaigns. According to IBM Security researchers Chen Nahman, Ofir Ozer and Limor Kessem, the new malware also uses remote overlay techniques and DLL hijacking to evade detection. 

Once embedded on a compromised PC, Vizom forms an infection chain through dynamic link library (DLL) hijacking - it force-loads malicious DLLs by naming its Delphi-based variants with unsuspecting file names found in directories of legitimate videoconferencing software. In Brazil’s case, the DLL is Cmmlib.dll, a file associated with Zoom.

What happens next is stealthy and treacherous. During an ongoing online transaction, the malware connects remotely to the compromised PC. It creates potent and believable HTML overlays and loads them in the Vivaldi internet browser in application mode. It then launches a keylogger that logs the user’s every keystroke when accessing their bank account. The malware then ships the acquired information to the attacker's command-and-control (C2) server. 

Vizom can also abuse Windows API functions, simulate mouse clicks and take screenshots.

There are no reports of hijacking in the US, but attacks have been observed across South America and Europe. 

Featured Resources

How virtual desktop infrastructure enables digital transformation

Challenges and benefits of VDI

Free download

The Okta digital trust index

Exploring the human edge of trust

Free download

Optimising workload placement in your hybrid cloud

Deliver increased IT agility with the cloud

Free Download

Modernise endpoint protection and leave your legacy challenges behind

The risk of keeping your legacy endpoint security tools

Download now

Recommended

Russia's "politically motivated" REvil raid could be used as leverage, experts warn
ransomware

Russia's "politically motivated" REvil raid could be used as leverage, experts warn

17 Jan 2022
Meta files lawsuit to uncover hackers targeting Facebook, WhatsApp
phishing

Meta files lawsuit to uncover hackers targeting Facebook, WhatsApp

21 Dec 2021
Five things to consider before choosing an MFA solution
Security

Five things to consider before choosing an MFA solution

17 Dec 2021
Australia and US sign CLOUD Act data-sharing deal to support criminal investigations
cyber crime

Australia and US sign CLOUD Act data-sharing deal to support criminal investigations

16 Dec 2021

Most Popular

How to move Microsoft's Windows 11 from a hard drive to an SSD
Microsoft Windows

How to move Microsoft's Windows 11 from a hard drive to an SSD

4 Jan 2022
How to boot Windows 11 in Safe Mode
Microsoft Windows

How to boot Windows 11 in Safe Mode

6 Jan 2022
Microsoft Exchange servers break thanks to 'Y2K22' bug
email delivery

Microsoft Exchange servers break thanks to 'Y2K22' bug

4 Jan 2022