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WannaCry's 'Kill Switch' May Have Been a Sandbox-Evasion Tool
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root1657
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root1657,
User Rank: Apprentice
5/22/2017 | 12:58:42 AM
I don't believe it was anti-sandbox either... it was a self-safety
I've been reading a lot of analysis, and I think the domain check was a method to prevent self infection (on the part of the threat actor). Doing this would be an effective safety on the weapon in your own evil lab, as you could use a few ficticious domains for this safety check, and have them resolve in house. Bombs and rockets usually dont arm until they are away from the laucher, so why should they design malware any differently?
Kelly Jackson Higgins
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Kelly Jackson Higgins,
User Rank: Strategist
5/23/2017 | 10:35:32 AM
Re: I don't believe it was anti-sandbox either... it was a self-safety
Interesting, root1657. Does that tell you the attackers are more or less sophisticated than if it were an anti-sandbox measure?
root1657
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root1657,
User Rank: Apprentice
5/28/2017 | 10:45:04 PM
Re: I don't believe it was anti-sandbox either... it was a self-safety
I'm not sure that it tells us about thier relative sophistication, because we dont have any of their other work to compare it to. I'm also not sure that attrbution of source or skill is a critical factor here. 

As I see this, the area where it is useful is in realizing that if they used some kind of safe switch so it couldnt attack it's creators in the lab, then perhaps the same could be used in our environments to help the defense as well. It would be a trivial matter for any organization to make the noted DNS entry properly resolve to a sinkhole in house, which would be enough to trigger the safey on this malware, and protect the organization, regardless of what happenes with the real DNS entry out in the world (which has been attacked by some jerks that want to bring it down).

Maybe it's useful in these attacks to look for signs and indicators of built in lab safety that may have been in the code and left in, so we can replicate the safeties at the same time we fight the malicious code.


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