Malik Haidar has spent his career at the front lines of cybersecurity, defending multinational corporations from the most elusive digital adversaries. With a deep background in threat intelligence and security analytics, he specializes in identifying the bridge between human fallibility and technical exploitation. Today, he shares his perspective on the disturbing rise of ClickFix campaigns, a social engineering evolution that turns a user’s own operating system tools into weapons by hiding malicious payloads in plain sight.
Modern social engineering often involves tricking users into pasting commands into the Windows Run dialog; how do attackers disguise these requests to appear as legitimate security procedures?
The brilliance of these attackers lies in their ability to weaponize “verification fatigue” through a fake CAPTCHA pop-up that looks indistinguishable from a real security check. Instead of the usual task of identifying traffic lights, the victim is prompted to open the Run dialog, paste a string of code from their clipboard, and press Enter to “verify” their identity. It is a chillingly effective tactic because it bypasses the standard browser warning systems entirely by moving the interaction to a trusted Windows administrative tool. When a user sees an official-looking prompt on a compromised website, they often follow the instructions without realizing they are manually executing a command that provides an immediate gateway for a VBScript payload.
The transition from downloading a payload to pre-fetching it into the browser cache marks a significant shift; what makes this “file-size matching” method so effective at evading detection?
By the time a user is tricked into interacting with the Windows Run box, the malicious script is already sitting quietly on their hard drive, disguised as a harmless image within the browser cache. The pasted command initiates cmd.exe, which specifically searches the browser profile for cached files starting with the prefix “f_” and compares their size against a hardcoded expected value. This approach is far more sophisticated than previous methods that searched for specific internal markers, as it allows the malware to remain dormant and unrecognized by traditional signature-based scanners. Once a size match is found, the system simply copies that file to a temporary folder with a .vbs extension and launches it using wscript.exe, effectively bypassing the character limits of the Run dialog.
Could you walk us through the intricate path this malware takes after the initial execution, specifically how it manages to stay hidden within legitimate processes and survive a system reboot?
Once the initial VBScript is active, it uses Windows Management Instrumentation to gather host details before pulling a PowerShell script that executes with its policy completely bypassed. The attack then escalates by compiling code directly in memory and injecting it into the legitimate timeout.exe process, a move designed to hide credential theft activities within a process that looks perfectly normal to a casual observer. To ensure they don’t lose access when the computer restarts, the attackers use the built-in tar.exe to unpack a hidden copy of Python. They then create a scheduled task that runs a Python payload through pythonw.exe, establishing a persistent foothold that survives reboots and allows for ongoing data exfiltration.
What is your forecast for the future of social engineering attacks that utilize built-in system tools?
As we move through 2026 and into the next few years, I expect social engineering to become even more integrated with “living off the land” techniques where attackers never bring their own tools but rather manipulate what is already there. We are likely to see more campaigns that target the RunMRU registry key and other system logs to understand user behavior before launching highly personalized, multi-stage attacks. The battle will move further away from blocking malicious downloads and toward monitoring unusual activity in trusted environments like PowerShell and WScript. Security teams will need to focus on granular application control and network protection, as the line between a user performing a routine task and an attacker hijacking a session continues to blur.
