T1161: LC_LOAD_DYLIB Addition
Mach-O binaries have a series of headers that are used to perform certain operations when a binary is loaded. The LC_LOAD_DYLIB header in a Mach-O binary tells macOS and OS X which dynamic libraries (dylibs) to load during execution time. These can be added ad-hoc to the compiled binary as long adjustments are made to the rest of the fields and dependencies [1]. There are tools available to perform these changes. Any changes will invalidate digital signatures on binaries because the binary is being modified. Adversaries can remediate this issue by simply removing the LC_CODE_SIGNATURE command from the binary so that the signature isn’t checked at load time [2].
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LC_LOAD_DYLIB Addition
Mach-O binaries have a series of headers that are used to perform certain operations when a binary is loaded. The LC_LOAD_DYLIB header in a Mach-O binary tells macOS and OS X which dynamic libraries (dylibs) to load during execution time. These can be added ad-hoc to the compiled binary as long adjustments are made to the rest of the fields and dependencies [1]. There are tools available to perform these changes. Any changes will invalidate digital signatures on binaries because the binary is being modified. Adversaries can remediate this issue by simply removing the LC_CODE_SIGNATURE command from the binary so that the signature isn’t checked at load time [2].
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Related techniques
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| Domain | ID | Name | Relationship / procedure |
|---|---|---|---|
| Enterprise | T1546.006 | LC_LOAD_DYLIB Addition Sub-technique | This object revoked by LC_LOAD_DYLIB Addition. |
All related ATT&CK context
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Imported snapshots across ATT&CK releases (1)
| Release | Bundle imported | Object version | Modified | Status | Raw hash |
|---|---|---|---|---|---|
| 19.1 | 1.1 | Current bundle Revoked | 7dc58568c2d7… |
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External references and citations
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[1]
Writing Bad Malware for OSX
Patrick Wardle. (2015). Writing Bad @$$ Malware for OS X. Retrieved July 10, 2017.
Open source URL -
[2]
Malware Persistence on OS X
Patrick Wardle. (2015). Malware Persistence on OS X Yosemite. Retrieved July 10, 2017.
Open source URL -
[3]
mitre-attack T1161Open source URL
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