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RTT· red team

RTT · red team

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Techniques›Defense Evasion›Beacon Object File (BOF) Execution

Defense Evasion

Beacon Object File (BOF) Execution

T1620 · MITRE ATT&CK

A Beacon Object File (BOF) is a C program compiled to a COFF object file and loaded by a C2 agent into its own process. Cobalt Strike Beacon and Havoc Demon support in-memory BOF execution. Fortra also documents that the network-interface resolution used by Cobalt Strike's built-in portscan dialog is implemented as a BOF; this is one internal component, not a claim that every portscan operation is an operator-supplied BOF. Cobalt Strike BOFs run within Beacon without creating a new process and are expected to be short and single-threaded. In-process execution can reduce child-process artifacts, but it still changes agent memory and behavior and is not inherently undetectable.

ArtifactsRESTRICTED_ACCESS_BLUR_MARKER

Steps1

CategoryIn-Memory Execution

Discuss in Advisor

Walkthrough

Step 1

RESTRICTED_ACCESS_BLUR_MARKER

RESTRICTED_ACCESS_BLUR_MARKER

Requirements: ALL(RESTRICTED_ACCESS_BLUR_MARKER)

Check before starting: RESTRICTED_ACCESS_BLUR_MARKER

Coverage Gap: No catalog tool command currently produces this step's declared outcomes.

RESTRICTED_ACCESS_BLUR_MARKER

Detection signal

Detection 01

RESTRICTED_ACCESS_BLUR_MARKER

Mitigations

Mitigation 01

RESTRICTED_ACCESS_BLUR_MARKER

OPSEC notes

RESTRICTED_ACCESS_BLUR_MARKER

References

Extended details

RESTRICTED_ACCESS_BLUR_MARKER