Researchers documented a malware campaign that uses a fake business-proposal disk image to trick Windows users into opening a shortcut disguised as a Word document. The shortcut shows a legitimate-looking PDF while silently installing CikaBika Bot, which lets attackers control the device through Discord, collect system details, capture screens, and steal files.
Key findings
- The lure is a disk image named "Proposition_Projet.img" that appears to contain a legitimate business-related document.
- The disk image contains a legitimate-looking French PDF and a Windows shortcut disguised as a Word document.
- Opening the shortcut displays the PDF as a distraction while a hidden PowerShell process runs in the background.
- The malware attempts to bypass Windows User Account Control and place a malicious DLL in Microsoft Edge's installation directory.
- Once installed, CikaBika Bot creates a dedicated Discord channel for each infected device and accepts attacker commands through Discord.
- The malware can collect system information, take screenshots, execute commands, manage processes, transfer files, access cameras, and stream screens.
- Attackers also use Ngrok for file transfer, reducing their dependence on Discord for data theft.
Who’s being targeted
- Commonly targeted roles: All employees who receive external documents or business proposals, Executive assistants, Sales and business development teams, Procurement teams, Finance teams, Windows device users.
Awareness takeaways
- Treat disk-image files and unexpected attachments as potentially dangerous, especially when they claim to contain proposals or business documents.
- Do not trust a document simply because it opens normally; a visible PDF can be used to distract you while malicious activity occurs in the background.
- Be cautious of files that look like Word documents but are actually shortcuts; verify file extensions before opening them.
- Report suspicious document lures promptly, because one opened shortcut can give an attacker broad control over a device and access to files.
Read the video transcript
A business proposal arrives: Proposition_Projet.img. That's a disk image, not a document. Inside, a file looks like Word, but it's a Windows shortcut. Open it, and a French PDF appears while hidden PowerShell runs. That's the trick: the PDF is a distraction. CikaBika Bot can then use Discord to take screenshots and steal files. Unexpected proposal in a .img file? Don't open it, report the attachment to security.