I found a weird star with Argon's help. Gaia DR3 4582145718700356096.

It's normal in visible light, stable and similar to our sun. In March 2010 it appeared ~60x brighter than expected in deep infrared heat (22 microns).

As if something around Mars-distance is catching 1.3% of the star's light and radiating it as heat.

Probably a huge cloud of debris from a major planetary collision. Or a radio-silent galaxy hiding behind it. But also the tiniest chance it's a technosignature.

Captured by NASA's WISE telescope, no observations at that wavelength since. Needs more data.