Probably not but it is fun now and then to worry about stuff that’s too exotic to really be happening. Most likely, anyway.
From Neel V. Patel at Slate:
… Anton Shkaplerov, a Russian cosmonaut who has already spent two stints aboard the International Space Station and is gearing up for a third mission to launch on Dec. 18, told Russian state media that scientists have found living bacteria sitting on the exterior of the Russian segment of the ISS. He claims the bacteria is not from Earth—it’s extraterrestrial in origin.
Hey, bacteria up there are not impossible:
Moreover, the upper reaches of the atmosphere are home to their own array of undiscovered forms of life. Bacteria that has adapted to withstanding low-pressure, low-oxygen altitudes in the air as well as more intense bouts of UV radiation are already resistant to extreme conditions and could conceivably find a way to handle the environment outside the atmosphere itself. Airborne organisms are not very well catalogued, and there are probably more than a few species hanging around the upper reaches of the atmosphere that scientists have yet to discover. More.
But if anyone seriously thought that Shkaplerov had found genuine ET life, lots of other folk would be headed up there looking…
Here’s a TASS PR making the claim.
See also: Why you, UD reader, are perchance not a member of the Party of Science…
and
Researchers: Chances of life on exoplanets less than supposed, due to stellar winds
Possibly space-hardy animals: