Do all "real" pop ups on PCs have an identifying element?

[Lämmchen]

Yesterday my husband showed me a screenshot of a popup someone got on his work computer and it didn't have any identifying elements to it, such as a logo or text for the name of the company...or a license number. It most likely is malware.

But do all "real" pop ups on PCs have an identifying element?

 

[PGen98]

Not always, but it's prudent to scan for malware to be safe whenever you suspect potential malware or even just a routine sweep

 

[Grungie]

Idk why a license number would show up. Not all pop ups are malware.