I have tried all the I have learned so far to figure out how to deal with this instance of obfuscation. enter image description here

So far I understand that an opaque predicate is present, causing an unconditional jump to one byte into L0.

What I don't understand is how to deal with this issue in IDA. If the jump is made to L0+1 how can I mark the byte E8 as data, or deal with this otherwise.

Any help would be appreciated. Thanks.

1 Answer 1


IDA is good at recognising such tricks, but if it didn't you can press D having the call instruction selected.

This will convert the opcode to a data, displaying just bunch of dbs. After that, select the byte that has db 58 (so one after E8) and press C to convert it to code again without the first byte.

Result after the changes.

enter image description here

I don't know if this could be automated - probably with some script that IDA supports it could be.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.