Don’t Get Teamed Up: How Microsoft Teams is Being Used for Malware Attacks

Beware, remote workers! Microsoft Teams is being exploited to spread DarkGate Loader malware. Hidden in a zip file disguised as a vacation schedule change, this stealthy bug may be more than an unexpected Teams message.

Hot Take:

Well, if you thought working remotely was all about sipping coffee in your pajamas and avoiding rush hour traffic, think again! Cyber ne’er-do-wells are exploiting good ol’ Microsoft Teams to spread DarkGate Loader, a malware that’s been on the block since 2017 but is now gaining some serious street cred in the underground world of cybercrime. A word of advice: Be wary of any unexpected Teams messages about changing vacation schedules. Spoiler alert: It’s not a beach party invitation.

Key Points:

  • Phishing campaign uses Microsoft Teams to distribute DarkGate Loader malware.
  • The malware is hidden in a zip file disguised as a change to vacation schedules.
  • The malicious code is concealed in the middle of an AutoIT script, enabling it to evade detection.
  • Microsoft Teams accounts are being compromised to spread the malware to other organizations.
  • DarkGate malware, though not yet widespread, is becoming an emerging threat to watch closely.

Need to know more?

Phishing in the Time of Remote Work

In this brave new world of remote work, cyber villains are getting creative. They've been sending out Teams messages that trick users into downloading a zip file that's supposedly about vacation schedule changes. But, it's all a ruse. Instead of getting a glimpse at a dreamy holiday plan, victims are gifted with the DarkGate Loader malware.

Hide and Seek: Malware Edition

This clever little bugger doesn't make it easy to find it. It uses an AutoIT script to conceal its malicious code right in the middle of the file. It even checks if the target computer has Sophos antivirus software installed before launching its attack. Talk about being sneaky!

Team Phishing for Teams

The culprits are compromising Microsoft Teams accounts to send their malicious gifts around. Despite the risks, Microsoft is playing it cool and suggesting admins simply apply safe configurations. Meanwhile, an attack method released by a Red Teamer in July 2023 is making this type of phishing attack even easier.

The DarkGate Saga

DarkGate is no new kid on the block. It's been around since 2017 but has been used rather sparingly. It's a versatile malware that supports a range of nefarious activities, from remote access to keylogging. Someone even tried to sell access to DarkGate for a whopping $100k/year. Lately, there have been reports of DarkGate distribution increasing, making it an emerging threat that needs to be watched closely. Get your popcorn ready, folks! This DarkGate saga is just getting started.