CircleCI Atomic Red Team doc generator
34 lines
1.7 KiB
Markdown
34 lines
1.7 KiB
Markdown
# T1009 - Binary Padding
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## [Description from ATT&CK](https://attack.mitre.org/wiki/Technique/T1009)
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<blockquote>Adversaries can use binary padding to add junk data and change the on-disk representation of malware without affecting the functionality or behavior of the binary. This will often increase the size of the binary beyond what some security tools are capable of handling due to file size limitations.
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Binary padding effectively changes the checksum of the file and can also be used to avoid hash-based blacklists 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)
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</blockquote>
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## Atomic Tests
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- [Atomic Test #1 - Pad Binary to Change Hash - Linux/macOS dd](#atomic-test-1---pad-binary-to-change-hash---linuxmacos-dd)
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<br/>
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## Atomic Test #1 - Pad Binary to Change Hash - Linux/macOS dd
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Uses dd to add a zero to the binary to change the hash
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**Supported Platforms:** macOS, Linux
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#### Inputs
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| Name | Description | Type | Default Value |
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|------|-------------|------|---------------|
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| file_to_pad | Path of binary to be padded | Path | /tmp/evil-binary|
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#### Run it with `sh`!
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```
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dd if=/dev/zero bs=1 count=1 >> #{file_to_pad}
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```
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<br/>
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