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T1027.001: T1027.001

View on MITRE ATT&CK The MITRE Corporation · Published 05/02/2020 15:04 · Modified 27/03/2026 01:09

Essential information

MITRE technique ID
T1027.001
Confidence
100/100
Revoked
No
Published
05/02/2020 15:04
Modified
27/03/2026 01:09
Author / Source
The MITRE Corporation

Aliases

Binary Padding

Platforms

windows macos linux

Description

Adversaries may use binary padding to add junk data and change the on-disk representation of malware. This can be done without affecting the functionality or behavior of a binary, but can increase the size of the binary beyond what some security tools are capable of handling due to file size limitations. Binary padding effectively changes the checksum of the file and can also be used to avoid hash-based blocklists and static anti-virus signatures.(Citation: ESET OceanLotus) The padding used is commonly generated by a function to create junk data and then appended to the end or applied to sections of malware.(Citation: Securelist Malware Tricks April 2017) Increasing the file size may decrease the effectiveness of certain tools and detection capabilities that are not designed or configured to scan large files. This may also reduce the likelihood of being collected for analysis. Public file scanning services, such as VirusTotal, limits the maximum size of an uploaded file to be analyzed.(Citation: VirusTotal FAQ)

Kill chain phases

Kill chainPhase
mitre-attack defense-evasion

Marking (TLP)

TLP:GREEN Copyright 2015-2025, The MITRE Corporation. MITRE ATT&CK and ATT&CK are registered trademarks of The MITRE Corporation.

External references

Related entities

Intrusion sets, malware, reports, vulnerabilities, indicators and other entities linked to this technique.