Full Report
ClickFix abuses clipboards. FileFix hijacks File Explorer. Both social engineering attacks start in the browser—and end in malware. See how Keep Aware stops these stealthy attacks before they break out of the browser in a run down of a real attack. [...]
Analysis Summary
# Incident Report: ClickFix/FileFix Clipboard Manipulation Attacks
## Executive Summary
This report summarizes observations regarding the 'ClickFix' and its successor, 'FileFix,' an attack technique leveraging social engineering within a web browser to silently populate a user's clipboard with malicious code. In a real-world scenario observed by a customer, this technique was used to deliver malicious PowerShell intended to deploy the NetSupportManager Remote Access Trojan (RAT). The attack was successfully neutralized by browser security controls monitoring clipboard activity.
## Incident Details
- **Discovery Date:** Not explicitly stated, but the real-world attack was recently encountered by a customer.
- **Incident Date:** Real-world attack recently encountered. The evolution (ClickFix/FileFix) is ongoing.
- **Affected Organization:** A Keep Aware customer (details not disclosed).
- **Sector:** Unspecified, likely any sector utilizing standard workstation environments.
- **Geography:** Unspecified.
## Timeline of Events
### Initial Access
- **Date/Time:** During a user browsing search engine results.
- **Vector:** Compromised website hosting malicious JavaScript, disguised as a CAPTCHA verification prompt.
- **Details:** The user clicked the fake CAPTCHA, allowing a malicious JavaScript payload to silently populate the host's clipboard with malicious PowerShell code.
### Lateral Movement
- *Not applicable/Not reached*: The attack chain was halted before lateral movement could commence on the host. The intent was to trick the user into pasting code into the Windows Run dialog, which would have initiated host compromise.
### Data Exfiltration/Impact
- **Intent:** Deployment of NetSupportManager RAT, leading to remote control, data access, and persistence setup (via the `Run` registry key).
### Detection & Response
- **How it was discovered:** Keep Aware's browser security platform detected suspicious commands being populated into the clipboard in real time.
- **Response actions taken:** The platform identified and blocked the suspicious content, warned the user, and effectively prevented the device compromise by neutralizing the clipboard payload.
## Attack Methodology
- **Initial Access:** Social engineering via compromised websites, disguised as CAPTCHA verification.
- **Persistence:** *Intended*: Setting persistence in the user’s `Run` registry key via the executed payload.
- **Privilege Escalation:** *Not explicitly detailed for the initial stage, but the payload execution aims for user-level access capability.*
- **Defense Evasion:** Relying on the user's action (pasting into the Run dialog) to execute code outside the visibility of traditional web application security, exploiting a blind spot between browser and host.
- **Credential Access:** *Not explicitly detailed in the initial stage, but the deployed RATs often facilitate credential theft.*
- **Discovery:** *Not detailed for this specific execution, but the deployed RATs typically perform discovery.*
- **Lateral Movement:** *Not reached.*
- **Collection:** *Not reached.*
- **Exfiltration:** *Not reached.*
- **Impact:** Successful execution leads to deployment of RATs (e.g., NetSupportManager, AsyncRAT, Lumma Stealer), resulting in remote control and data theft.
## Impact Assessment
- **Financial:** Costs associated with incident response and remediation would apply if successful; otherwise, minimal cost incurred due to prevention.
- **Data Breach:** Potential high-severity breach of sensitive data if RAT deployment was successful.
- **Operational:** Risk of full system compromise and remote control.
- **Reputational:** Potential damage if system compromise became public knowledge.
## Indicators of Compromise
*(Note: IOCs are listed here in their general form as described, as specific hash/IP details were omitted in the source article).*
- **Network indicators:** Malicious JavaScript delivered from a compromised site linked via search engine results.
- **File indicators:** Malicious PowerShell script intended for download/de-obfuscation/assembly of malware on the host.
- **Behavioral indicators:** Silent population of the local clipboard with executable code, followed by instructions to paste into privileged/command-line interfaces (like the Windows Run dialog).
## Response Actions
- **Containment measures:** Browser-native platform monitoring identified and blocked the malicious clipboard copy operation.
- **Eradication steps:** The threat was intercepted at the browser level; no host eradication was necessary.
- **Recovery actions:** Clipboard contents were cleared; user warned about the social engineering prompt.
## Lessons Learned
- Traditional security defenses often miss the critical vector where browser activity interfaces with the host operating system (specifically clipboard manipulation).
- Social engineering, when combined with JavaScript execution in the browser, remains a potent technique even for delivering complex malware like RATs.
- Clipboard manipulation techniques like ClickFix/FileFix exploit the trust inherent in user interaction (e.g., clicking a CAPTCHA).
## Recommendations
- Implement browser security monitoring solutions capable of real-time analysis of clipboard access patterns and API calls originating from web pages.
- Deploy endpoint controls that flag or sanitize commands pasted from the clipboard into sensitive execution environments (e.g., Command Prompt, PowerShell, Run dialog).
- Increase user awareness training specifically targeting social engineering themes that involve "fixing" browser issues or passing verification checks that require pasting commands.