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What could've possible broken AOB signature? (WASM game)

 
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buretto
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PostPosted: Sun Aug 01, 2021 4:53 pm    Post subject: What could've possible broken AOB signature? (WASM game) Reply with quote

I'm targeting a WASM game.

Yesterday I located the instruction I wanted to target and eventually also came up with a seemingly working AOB signature. I initially found in on a Win10 PC using Firefox browser.

I first tested it on a separate PC running Win7 on chrome and then Firefox, both failed. I then decided to try it on the same initial Win10 PC, on a fresh install of Firefox Nightly. I was surprised to find that this worked -- it found the AOB. I repeated this many times yesterday, so I thought maybe this is good enough evidence that it should work (at least on this particular PC).

During this whole time I kept the initial browser open just in case it wasn't good enough.

Now it's the next day, I realized I've closed initial browser so using a fresh Firefox session I to try finding the AOB again, and unfortunately it's not being found. I tried it with Firefox nightly as well.

I'm just curious what factors could have caused the instruction pattern to change?

My initial guess was that the developer/host of the WASM game might've updated it, deployed a new version which could've messed everything up.

Or is it something I overlooked, or don't understand yet?

Any insights / suggestions as to why this might've happened is greatly appreciated.

PS:
Unfortunately I can't disclose the particular game.
Additional information that might be relevent: PC didn't power off, but did go into sleep mode.
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atom0s
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PostPosted: Sun Aug 01, 2021 10:46 pm    Post subject: Reply with quote

Depends on the implementation of WASM being used. If its using JIT, then the piece of code you are scanning for may not have been used/ran yet so it won't exist in memory yet.

Otherwise, an update could also be the cause where the WASM binary was recompiled and thus stuff changed/shifted etc.

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