Phishing Attacks Disguised as Fake Cert Errors on Cisco Webex Used to Steal User Credentials

Cisco | May 07, 2020

  • Convincing series of phishing attacks are using fake certificate error warnings with graphics and formatting lifted from Cisco Webex emails to steal users' account credentials.

  • According to stats shared by email security company Abnormal Security, these phishing emails have already landed in the mailboxes.

  • The phishing emails impersonate the Cisco Webex Team and warn the targets that they have to verify their accounts as they are blocked by the administrator.


Cisco Webex is a video and team collaboration solution that helps users set up video conferences, webinars, online meetings, and share their screens with their colleagues and friends. The platform is currently facing an influx of new users due to the unusual remote working increase caused by the COVID-19 pandemic. According to stats shared by email security company Abnormal Security, these phishing emails have already landed in the mailboxes of up to 5,000 targets that use Cisco Webex while working remotely.


The attackers induce a sense of urgency with their phishing messages by using cloned graphics and formatting designed to closely mimic automated SSL certificate error alerts that Cisco Webex would send to users. The phishing emails impersonate the Cisco Webex Team and warn the targets that they have to verify their accounts as they are blocked by the administrator because of Webex Meetings SSL cert errors. Users are then requested to click on an embedded 'Log in' hyperlink that will allow them to sign in and unlock their accounts.



Learn more: PHISHING KITS BECOME “BESTSELLER” IN THE UNDERGROUND MARKET: RESEARCH
 

"The attacker could use the compromised user account to send further attacks within the organization and to external partners," .

~ Researchers say .


Seeing that this phishing campaign almost perfectly clones, it should be able to bypass at least some Secure Email Gateways' (SEGs) protections and convince many of the targets to visit the attackers' phishing landing page instead of deleting or sending the phishing emails to the Spam folder. Other video conferencing platforms' users are also being targeted during this challenging time because of the increase in the number of remote workers.

“For instance, another highly convincing phishing campaign spotted by Abnormal Security las month used cloned imagery from automated Microsoft Teams alerts to harvest Office 365 credentials from almost 50,000 users” .


Other video conferencing platforms' users are also being targeted during this challenging time because of the increase in the number of remote workers. Phishing attacks are also targeting Zoom users with fake Zoom meeting notifications being used to threaten potential victims who work in corporate environments that their contracts will be suspended or terminated, with the end goal of harvesting their email addresses and passwords.


What makes all these phishing campaigns even more dangerous than regular ones is that their targets are currently being flooded with alerts from various online collaboration services which makes them prone to ignoring any red flags that would otherwise enable them to recognize such attacks. Real users explain how to implement robust protection with Cisco Email Security’s sophisticated filtering, built-in intelligence and policy definition and enforcement capabilities.


Learn more: COVID-19 AND AMYGDALA HIJACKING IN CYBER SECURITY SCAMS .
 

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