LC_MAIN Hijacking
**This technique has been deprecated and should no longer be used.** As of OS X 10.8, mach-O binaries introduced a new header called LC_MAIN that points to the binary’s entry point for execution. Previously, there were two headers to achieve this same effect: LC_THREAD and LC_UNIXTHREAD (Citation: Prolific OSX Malware History). The entry point for a binary can be hijacked so that initial execution flows to a malicious addition (either another section or a code cave) and then goes back to the initial entry point so that the victim doesn’t know anything was different (Citation: Methods of Mac Malware Persistence). By modifying a binary in this way, application whitelisting can be bypassed because the file name or application path is still the same.
Mitigations |
|
| Mitigation | Description |
|---|---|
| Code Signing |
Enforce binary and application integrity with digital signature verification to prevent untrusted code from executing. |
| LC_MAIN Hijacking Mitigation |
Enforce valid digital signatures for signed code on all applications and only trust applications with signatures from trusted parties. |
Detection
Determining the original entry point for a binary is difficult, but checksum and signature verification is very possible. Modifying the LC_MAIN entry point or adding in an additional LC_MAIN entry point invalidates the signature for the file and can be detected. Collect running process information and compare against known applications to look for suspicious behavior.
Связанные риски
Каталоги
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