What Is Payloadless Malware?
There’s no denying that organizations learn to refine their protection measures – but so do threat actors for their infiltrating techniques. Traditional email services such as M365 with filtering/intrusion detection systems are ineffective for all phishing methods and advanced attacks. Emails with payloadless malware represent a particularly insidious form of attack that has recently grabbed the headlines.
This malicious tactic enables cybercriminals to sneak into an organization’s email network or other systems without the payloads typically associated with harmful software. The payloadless method leverages harder-to-detect malware delivery techniques and psychological manipulation to execute attacks. It reflects the ingenuity of threat actors and emphasizes the need for organizations to never stop revamping their security strategies.
Payloadless Phishing Attacks Explained
To understand what the payloadless method involves, you should first grasp the concept of a payload in the context of phishing. In email-based attacks, a payload is a harmful element delivered through links or attachments. Once activated by the recipient, it can install malware on the system or harvest sensitive information. A payload often appears as a downloadable file that contains a virus or a link to a malicious website. The good thing about it is that it is easy to spot with reliable detection solutions.
The threat of payloadless malware is so frightening because it involves no payloads that most organizations are aware of. Also known as a fileless phishing attack, it dupes people into following a malicious actor’s instructions without overt virus-containing attachments embedded in an email. Payloadless is a text-based method that manipulates recipients into taking action during a personal call or through a third-party application. It guides them to reveal information or download malware solely through text in the body of the email.
Unfortunately, the success rate of payloadless malware attacks is alarmingly high. They work because they can’t be initially detected by conventional email security tools, which focus on scanning links, attachments, and known malware signatures. On top of that, psychological factors play into cybercriminals’ hands, like when employees feel pressured to comply with requests that they think may affect their careers.
The simplicity and directness of payloadless attacks make them particularly appealing to cybercriminals. The lack of technical components that could trigger automated security alerts allows these attacks to slip under the radar to provide threat actors with what they want.
Examples of Payloadless Phishing Attacks
Fileless phishing emails can be sent to organizations and individuals. They may describe different problems and urge you to take different actions. But the result is always the same – they want you to install a malware-ridden file or steal your data or money.
Here are the types of emails you can receive without knowing that a payloadless attack is already in full swing. Pay special attention to the social engineering tactics used to manipulate recipients into compromising their own security.
”Please Make a Payment by 3 PM”
An attacker impersonates a company executive and emails a finance team member. The message claims that urgent financial transfers are needed for a high-priority project. Instead of including links or attachments, the email relies solely on text and describes that further instructions will be shared through some file storage platform. It uses persuasive language and mentions time limits so the employee has less time to verify the details, acts fast to view the “instructions,” and downloads payloadless malware.
”Check Our New Requirements”
An employee receives an email from what appears to be the vendor their company has been working with for a long time. It states that there has been a change in certain procedures, terms, or conditions. The recipient is instructed to call the vendor to learn where they can get familiar with the changes. Having spoofed the vendor’s email address, the threat actor guides them beyond the email network to steal data.
”Update Your Records ASAP”
A cybercriminal sends an internal email to all employees announcing a new company policy that requires immediate compliance. The message requests employees to confirm their acknowledgement by replying with their personal information, such as Social Security numbers. The nature of the request tricks employees into providing sensitive data directly or asking for more details. The latter scenario may lead to follow-up emails that urge employees to download payloadless malware disguised as Google Forms shared through other channels.
”Rate Your Experience”
An attacker poses as a customer service representative and sends a follow-up email to clients asking to arrange a call to receive feedback on a recent service. They will use standard phrases and, most likely, incentives to galvanize you into action under the guise of refining service quality. The text-only format avoids detection by security tools, and the threat actor can gather personal information in abundance during the fake call.
Major Fileless Malware Detection Techniques
Identifying a fileless phishing attack is a tall order without a reasonable departure from signature-based detection methods, which primarily recognize known threats based on file characteristics. Given that payloadless lacks those characteristics, conventional techniques prove ineffective.
Advanced cyber threats call for advanced protective solutions. Without further ado, you can get started with behavioral analysis tools to fight back payloadless email campaigns. These tools are great for spotting deviations from normal communication patterns, including:
- Unusual tones
- Inconsistency
- Suspicious content that slips through the cracks of filters
- Other anomalies
Natural language processing (NLP) can also be adopted to detect and repel payloadless attacks. By analyzing the content of emails for linguistic patterns indicative of social engineering tactics, NLP solutions can turn the spotlight on advanced cyber threats before they compromise your security. Furthermore, implementing machine learning algorithms allows for the continuous reinforcement of your cyber defenses as they are risk-adaptive.
Let’s make it clear: it’s not that organizations should give up on email filtering or other traditional cybersecurity solutions. Behavioral analysis and NLP techniques should be considered in addition to basic protection to minimize the dangers of evolving cyber risks.
Fileless Malware Prevention Strategies
To bolster your cyber defenses against known and evolving threats, you should prioritize strategies based on both technology and human factors. Here’s what is particularly effective against payloadless malware:
- Behavioral AI + NLP. Adopt AI-powered user behavior analytics (UBA) for profiles of normal user activity and NLP tools for context analysis. These can enhance the filtering ability of a standard gateway, flag deviations for review, or temporarily lock accounts under threat of compromise.
- Relationship graphs. Create a database that maps relationships and interactions within your organization based on email exchanges, personal meetings, and financial transactions. This can help you prevent a successful payloadless attack that begins with an unusual or unexpected email from a vendor, a company executive, or a colleague.
- Zero-trust policy. Embrace a zero-trust model organization-wide. There’s no room for naivety when cyber threats loom on the horizon. This framework requires continuous verification of user identities and a stricter policy for setting up and confirming access permissions.
- Employee training. Technology isn’t omnipotent, for better or worse. Educate your staff about the tactics used in payloadless malware attacks so that your people are aware of the red flags to watch out for. Make sure they have quick-reference guides at hand and can consult a cybersecurity expert if suspicions arise.
At Spambrella, we develop cyber threat prevention strategies with AI-powered technology and comprehensive training. Our email security solutions can cope with the risks tied to the latest payloadless malware tactics and advanced phishing attempts. We also have training modules to reinforce cybersecurity awareness, making Spambrella a reliable partner for thousands of security-conscious organizations around the world.
You shouldn’t be afraid of fileless phishing attacks. You should be prepared for them. Get in touch with us to be updated on the best cyber threat prevention strategy for your business, carry out additional cybersecurity implementations, or get all your employees on the same page about payloadless and other sophisticated tactics.
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