![]() ![]() Microsoft Teams has client-side protections in place to block file delivery from external tenant accounts. BleepingComputer reported in June of 2023 that security researchers had found a simple way to deliver malware to an organization with Microsoft Teams, despite restrictions in the application for files from external sources. ProtectionĬurrent Microsoft Teams security features such as Safe Attachments or Safe Links failed to detect or block this attack. When the shellcode is run, the first thing it uses is the “byte by byte” technique aka called stacked strings, to create a new file: a Windows executable identified as DarkGate Loader. The pre-compiled AutoIT script hides the code in the middle of the file and, on execution, drops a new file that contains shellcode. zip files with names like "Changes to the vacation schedule.zip." The ZIP file contains a malicious LNK file (shortcut) posing as a PDF document: "Changes to the vacation ."Ĭlicking the shortcut executes a command line which triggers the download and execution of a renamed cURL (a command-line tool for getting or sending data including files using URL syntax) to download and execute Autoit3.exe and a bundled script. The download locations observed in the Teams attacks were URLs hosting. When the user opens the downloaded MSI file, the DarkGate infection is triggered. If the requirements set by the attacker are met, the TDS will redirect the victim user to the final payload URL for the MSI download. The distributed link initially points to a traffic distribution system (TDS). The message content aimed to social engineer the recipients into downloading and opening a malicious file hosted remotely.” “On August 29, in the timespan from 11:25 to 12:25 UTC, Microsoft Teams chat messages were sent from two external Office 365 accounts compromised prior to the campaign. What’s new is that the researchers found evidence of a campaign using Microsoft Teams to deliver the DarkGate Loader. Once active, the malware can be used for several malicious activities like remote access, cryptocurrency mining, keylogging, clipboard stealing, and information stealing. But Malwarebytes also found DarkGate reloaded via malvertising and SEO poisoning campaigns.Ī cybercriminal who goes by the handle RastaFarEye has been advertising DarkGate Loader on cybercrime forums since June 16, 2023. The malspam campaign used stolen email threads to lure victims into clicking a hyperlink, which downloaded the malware. Until now, DarkGate was typically distributed via phishing emails. On the Content Control screen, click the menu icon next to the website you want to remove from the Content Control list.Researchers have found a new method by which cybercriminals are spreading the DarkGate Loader malware.In the confirmation window, click Yes, delete.On the Content Control screen, click the menu icon at the top of the table.Click the X button to close the search box.ĭelete stored websites Delete all websites.Matching websites show in the list below. Enter the website name, domain, URL, or IP address in the search field.On the Content Control screen, click the magnifying glass icon at the top of the table to display the search box.Search for a website to see if is in the list, or to identify a site you want to delete. The website is added to the Content Control list. Alternatively, click the link icon to the right of the field to automatically add the address of the website you are currently on.Enter the website's domain, URL, or IP address in the Add a URL or IP address field.On the Content Control screen, click the +Add Website button.Add a websiteĪdd a website to prevent you from navigating to the website. In the upper-right corner of the Browser Guard screen, access the Content Control screen through the menu icon. This feature is available on Chrome, Edge, and Firefox browsers, on Windows devices that have Malwarebytes Security & Antivirus installed with an active Trial or Premium subscription. The Content Control feature in Browser Guard blocks websites based on the website's URL, domain, or IP address. Personalize your browsing experience by blocking content you don't wish to see.
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