Incomplete decompilation in golang binary

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#7,435 opened on Sep 27, 2025 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 35/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: go
Domain: reverse-engineering

Research direction

Open the attached asd.exe, navigate to main.main, and inspect Pseudo C and MLIL around 0x004cdbe9 and the branch at 0x004cdc90. Reproduce the incorrect always-false branch and confirm that correcting the analysis allows the remaining main-function code to appear in the decompilation.

Written by the indexing model from the issue text.

Description

Core: Calling Convention Core: Dataflow Effort: Medium Impact: Medium Language: Go

Version and Platform (required):

Binary Ninja Version: 5.2.8286-dev
Edition: Non-Commercial
OS: Windows
OS Version: 10
CPU Architecture: x64

Bug Description:
BInary NInja doesn't fully decompile the main function, decompiler output ends at runtime.ncpu_3 = runtime.ncpu_3;, but there is more code. The bug happens because MLIL thinks that branch at 0x004cdc90 is always false

Steps To Reproduce:

Open asd.exe
Go to main.main function
Open Pseudo C and MLIL (or any other lower BNIL)
Go to 0x004cdbe9
See that in MLIL there is more code.

Expected Behavior:
Full decompilation of main function

Binary:
asd.zip

Dominant language: C++
Stars: 1.3k
Forks: 298
Avg merge: 5d 5h
Merged PRs (30d): 19

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