Summary Points
- Threat actors are exploiting legitimate RMM tools like Action1 by deploying malicious phishing campaigns that deliver fake invoices redirecting to malicious scripts and MSI files.
- Attackers abuse cloud infrastructure, using compromised or free accounts of RMM providers to host and execute malware, embedding persistence mechanisms like service installation and registry modifications.
- The targeted use of signed but expired RMM tools allows malware to potentially bypass detection, enabling sustained remote access and operational control over compromised systems.
Threat, Attack Techniques, and Targets
Threat actors are increasingly abusing Remote Monitoring and Management (RMM) tools in the wild. In this case, attackers use phishing emails that deliver fake PDF invoices. When victims open the PDFs, they are redirected to a malicious Visual Basic Script (VBS) file. This script is straightforward and not hidden, making it easy to analyze. The VBS then loads a decoy PDF to distract the victim. Meanwhile, a malicious MSI file is downloaded and installed. This MSI contains four files linked to an RMM tool developed by Action1. The files are not flagged as malicious by VirusTotal and are signed with an expired Action1 certificate. The malware installs itself as a service called “A1Agent” and maintains persistence. The attack targets organizations that might use or trust RMM tools, especially those with misconfigured or unprotected cloud infrastructure.
Impact, Security Implications, and Remediation Guidance
The abuse of RMM tools in this way allows threat actors to gain ongoing access to infected systems. They can execute commands, maintain persistence, and potentially move laterally within networks. This creates serious security risks, especially for organizations that rely on cloud-based management tools. The use of signed files and legitimate infrastructure can make detection challenging. For mitigation, organizations should review their RMM tool configurations and monitor for unusual activity. However, specific remediation steps should be obtained from the vendor Action1 or relevant security authorities to ensure proper response and patching.
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