Monday, April 26, 2021

Using PE-SIEVE to unpack malware

Just practicing unpacking malware with this sample


What worked was using x64dbg

Attach a breakpoint on CreateProcessInternalW

if I ran a few lines past this I saw a child process spawned (svchost.exe)

And given the context and strings around this call I saw "NtResumeThread" among others

So I set a breakpoint on NtResumeThread (which appears to be ready to launch code in the child process svchost.exe)

Then open a new 2nd instance of x64dbg

"Attach" to svchost.exe , which really isn't doing much right now

Go to the threads tab and you'll see 2 of them!

1 of them is in the "suspended" state

Click into that suspended state and set a breakpoint on the 1st line of code in there

Then click "run" in svchost.exe just to get it so you're not stuck on any breakpoints anymore

Then return to the original x64dbg and click "detach" to allow it to proceed and start the "svchost.exe" process

In the x64dbg on svchost you should now hit it's breakpoint

Now you're inside the 2nd state of the malware but the malicious code hasn't been unpacked so there are still no good strings yet.

Set a breakpoint on VirtualAlloc's ret 10 statement.

Run, then check strings.  If you see nothing, run again, and check strings.

Proceed until you notice the good strings ... (like URLs, etc.)

Then one easy way to get the executable out of memory is to just run 

pe-sieve64.exe /pid ??? 

it will dump the unpacked executable for you


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