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Attack Patterns T1027.016 — Junk Code Insertion
T1027.016

Junk Code Insertion

Stealth
TLP:CLEAR

Description

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.(Citation: ReasonLabs)(Citation: ReasonLabs Cyberpedia Junk Code) 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.(Citation: ReasonLabs) 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.

MITRE ATT&CK Detection Strategies
1

DET0322 Detection Strategy for Junk Code Obfuscation with Suspicious Execution Patterns
AN0913 Windows

Detects the presence of executables with high NOP padding, unusually large binary size for their function, and follow-on execution or memory injection from such files, especially when originating from temp or user-space paths.

WinEventLog:Sysmon WinEventLog:Sysmon WinEventLog:Sysmon
AN0914 Linux

Detects ELF binaries written to disk that demonstrate anomalous file size or entropy, quickly followed by execution or memory region writes into remote processes (e.g., using ptrace).

auditd:SYSCALL auditd:SYSCALL auditd:SYSCALL
AN0915 macOS

Identifies Mach-O binaries dropped into temporary directories with abnormally high binary size or padding patterns, followed by privilege escalation, `exec`, or memory mapping of other processes.

macos:endpointsecurity macos:endpointsecurity macos:endpointsecurity

MITRE ATT&CK Mitigations
1

M1049

Antivirus/Antimalware

Antivirus/Antimalware solutions utilize signatures, heuristics, and behavioral analysis to detect, block, and remediate malicious software, including viruses, trojans, ransomware, and spyware. These solutions continuously monitor endpoints and systems for known malicious patterns and suspicious behaviors that indicate compromise. Antivirus/Antimalware software should be deployed across all devices, with automated updates to ensure protection against the latest threats. This mitigation can be implemented through the following measures: Signature-Based Detection: - Implementation: Use predefined signatures to identify known malware based on unique patterns such as file hashes, byte sequences, or command-line arguments. This method is effective against known threats. - Use Case: When malware like "Emotet" is detected, its signature (such as a specific file hash) matches a known database of malicious software, triggering an alert and allowing immediate quarantine of the infected file. Heuristic-Based Detection: - Implementation: Deploy heuristic algorithms that analyze behavior and characteristics of files and processes to identify potential malware, even if it doesn’t match a known signature. - Use Case: If a program attempts to modify multiple critical system files or initiate suspicious network communications, heuristic analysis may flag it as potentially malicious, even if no specific malware signature is available. Behavioral Detection (Behavior Prevention): - Implementation: Use behavioral analysis to detect patterns of abnormal activities, such as unusual system calls, unauthorized file encryption, or attempts to escalate privileges. - Use Case: Behavioral analysis can detect ransomware attacks early by identifying behavior like mass file encryption, even before a specific ransomware signature has been identified. Real-Time Scanning: - Implementation: Enable real-time scanning to automatically inspect files and network traffic for signs of malware as they are accessed, downloaded, or executed. - Use Case: When a user downloads an email attachment, the antivirus solution scans the file in real-time, checking it against both signatures and heuristics to detect any malicious content before it can be opened. Cloud-Assisted Threat Intelligence: - Implementation: Use cloud-based threat intelligence to ensure the antivirus solution can access the latest malware definitions and real-time threat feeds from a global database of emerging threats. - Use Case: Cloud-assisted antivirus solutions quickly identify newly discovered malware by cross-referencing against global threat databases, providing real-time protection against zero-day attacks. **Tools for Implementation**: - Endpoint Security Platforms: Use solutions such as EDR for comprehensive antivirus/antimalware protection across all systems. - Centralized Management: Implement centralized antivirus management consoles that provide visibility into threat activity, enable policy enforcement, and automate updates. - Behavioral Analysis Tools: Leverage solutions with advanced behavioral analysis capabilities to detect malicious activity patterns that don’t rely on known signatures.

Details

Platforms
Linux
Macos
Windows
Added
May 2, 2026
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