Greyware is a term used to describe software or applications that are potentially unwanted or may pose a security risk. It may be adware, spyware, or other types of malicious or disruptive software.

What is greyware?

Greyware (někdy také „grayware“) je pojem označující software, který není jednoznačně škodlivý jako malware, ale přesto může být pro firmu nežádoucí. Typicky jde o aplikace, které zpomalují zařízení, narušují soukromí, zobrazují nevyžádané reklamy nebo sledují chování uživatele bez jeho vědomí. Greyware často obchází bezpečnostní politiky firem a zvyšuje riziko útoků.

Where greyware appears in practice

Examples of greyware in business environments:

• PC optimizers or registry cleaners that promise performance improvements but actually collect data and show ads.
• Browser extensions that change default search engines or redirect search results.
• Adware Adware – programs that display intrusive advertisements without user approval.
• PUPs (Potentially Unwanted Programs) silently installed alongside other software.
• Remote access tools installed without IT approval (known as shadow IT).

These examples highlight how greyware often disguises itself as useful software, while introducing security risks, system instability, or privacy violations.

Greyware vs. related terms

• Greyware vs. malware – Malware is clearly harmful and malicious; greyware may not be overtly dangerous but can still undermine security.
• Greyware vs. PUP – PUPs are a common subtype of greyware; they’re often bundled with legitimate software.
• Greyware vs. spyware – Spyware secretly monitors users; greyware may include such behavior but it’s not always its core function.

Understanding these distinctions helps define security policies more precisely. Not all risks come from malware – semi-legitimate software can be just as disruptive if not managed properly.

How to adress greyware in your company

Recommended steps:

1. Enforce an application control policy – Use whitelists and blacklists to manage which apps are allowed.
2. Audit endpoints regularly – Check workstations for unauthorized or suspicious software.
3. Deploy advanced detection tools – EDR or antivirus solutions with greyware detection capabilities.
4. Educate staff – Teach employees to recognize risky apps or software disguised as helpful tools.
5. Restrict software installations – Only allow apps from a controlled corporate repository.

Businesses often underestimate greyware because “it’s not a virus.” But greyware can open doors to more serious threats, compromise user trust, and degrade system performance. Treating it as part of your overall cyber hygiene is essential for a secure and stable IT environment.