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In this post, we highlight some of the important benefits that commands introduce, as well changes we are making to Office Store policies to require the use of commands in Word, Excel, and PowerPoint add-ins. We have seen that users are more likely to continue to use add-ins that have command entry points in the Office ribbon, so using add-in commands can increase the retention rate for your add-ins. Commands enable you to extend the Office UI across multiple platforms. Add-in commands were made available in Outlook in November 2015. For other questions on how we can help, use our general contact form.In March 2016, we released add-in commands for Word, Excel, and PowerPoint for Office desktop and Office Online.
If you need urgent assistance with an incident, contact the Secureworks Incident Response team. The URL and domains may contain malicious content, so consider the risks before opening them in a browser.Ī8da877ebc4bdefbbe1b5454c448880f36ffad46d6d50083d586eee2da5a31ab To mitigate exposure to this malware, CTU researchers recommend that organizations use available controls to review and restrict access using the indicators listed in Table 1.
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The malware uses Windows shortcut (.lnk) files for persistence.
Once executed, JSSLoader collects basic system information, sends the information to the C2 server, and then waits for commands. NET class and function names, simplistic encoding and decoding functions, a large number of unused strings, and string splitting/concatenation to avoid reliable detection (see Figure 3).įigure 3.
#Microsoft excel add ins for mac code#
NET code lacks robust obfuscation, instead relying on variable. NET and include only minor differences from late 2021 samples. Samples observed in 2022 continue to use. In late 2021, JSSLoader samples written in the original. The malware authors have made several changes over the years, including briefly shifting to C++ code in mid-2021. C2 beacon sending harvested system information and decoded data.
#Microsoft excel add ins for mac download#
The JSSLoader RAT can harvest data about the compromised system and send it to a command and control (C2) server (see Figure 2), run commands, download additional malicious payloads, and execute files.įigure 2. Excel security warning triggered by malicious XLL file. If the user enables the add-in, its code executes within the context of the Excel process, attempts to download a JSSLoader binary to the %TEMP% directory, and then executes the binary.įigure 1. Executing the XLL file launches Excel and displays a security warning (see Figure 1). The XLL files analyzed by CTU™ researchers use the ExcelDna.xll filename, possibly to mimic a legitimate Excel add-in project of the same name. This approach is consistent with previous GOLD NIAGARA activity. The original delivery mechanism was unavailable for analysis, but the add-ins were reportedly delivered via invoice-themed emails. These observations indicate a change to tactics, techniques, and procedures (TTPs), as the threat actors previously leveraged malicious executable files or Excel macros. An Excel add-in extends Excel functionality, typically uses the '.xll' file extension, and functions similar to a dynamic link library (DLL).
JSSLoader is a remote access trojan (RAT) that was first observed in 2019 and is used by the GOLD NIAGARA cybercrime group. Secureworks® Counter Threat Unit™ (CTU) researchers observed multiple malicious Microsoft Excel add-ins delivering JSSLoader malware.
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