Japan’s space agency said on Friday that it found a computer virus
I hope the term "virus" is being misused, yet again, to describe a rootkit or other malware, because mistaking a rootkit to be a virus could prove catastrophic.
I cannot see a virus stealing data. Viruses are not very stealthy either. I would say that a virus/rootkit hybrid would be more likely,but that would not be needed unless it is intended to mass infect millions of computers. I would say the virus is a decoy, as to give a false sense of securtiy when it is removed, only to leave the intel gathering tools of the rootkit behind, but I don't think a hacker wants any malware removal going on when he is trying to extract intel. I could imagine that the virus was part of the exploit, but they are really to noisy for a calculated malicious data extraction operation, unless the rootkit's tools are so embedded that only a virus shows up and is able to be removed.
Like the article implied, it could just be a random infection because someone was not "surfing safe" on critical OS's. Regardless, where there is data extraction, there is a rootkit with a keylogger and sceen shots, at the very least.
Sounds like they could use ESET, Comodo, Emsisoft, KIS, Threatfire, or Malware Defender.