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Get Started Free →cyberstrikeus/T1027.016_junk-code-insertion
Adversaries may use junk code / dead code to obfuscate a malware’s functionality.
Passed 19 of 23 test cases with the skill, and 15 of 23 without it.
and 1 more in the full report
4 fixed15 passed either way4 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.
Our application security team is categorizing a finding where benign, non-functional code blocks were inserted into a binary payload to bypass static analysis tools. Which specific Common Weakness Enumeration ID applies to this sub-technique?
| Checked | Without skill | With skill |
|---|---|---|
| Identifies CWE-693 as the relevant weakness category | Missed | Passed |
The instructions your model reads when the skill loads.
Sub-technique of: T1027
Adversaries may use junk code / dead code to obfuscate a malware’s functionality. Junk code is code that either does not execute, or if it does execute, does not change the functionality of the code. Junk code makes analysis more difficult and time-consuming, as the analyst steps through non-functional code instead of analyzing the main code. It also may hinder detections that rely on static code analysis due to the use of benign functionality, especially when combined with Compression or Software Packing.
No-Operation (NOP) instructions are an example of dead code commonly used in x86 assembly language. They are commonly used as the 0x90 opcode. When NOPs are added to malware, the disassembler may show the NOP instructions, leading to the analyst needing to step through them.
The use of junk / dead code insertion is distinct from Binary Padding because the purpose is to obfuscate the functionality of the code, rather than simply to change the malware’s signature.
Platforms: Linux, macOS, Windows
Identify Attack Surface: Determine if the target environment is susceptible to Junk Code Insertion by examining the target platforms (Linux, macOS, Windows).
Assess Existing Defenses: Review whether mitigations for T1027.016 are in place. If defenses are absent or misconfigured, this technique may be exploitable.
Execute Test: Use tools and methods described in the MITRE ATT&CK page and external references below.
Note: No Atomic Red Team tests available for this technique. See Atomic Red Team GitHub for updates.
test cases passed, vs 15 / 23 without
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