Techniques › T1001 › T1001.001
T1001.001 Junk Data
command and control — ESXi, Linux, macOS, Windows · attack.mitre.org · JSON
1
MITRE detection strategy
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analytics
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Sigma rules tagged attack.t1001.001
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KEV CVEs mapped here
<p>Adversaries may add junk data to protocols used for command and control to make detection more difficult. By adding random or meaningless data to the protocols used for command and control, adversaries can prevent trivial methods for decoding, deciphering, or otherwise analyzing the traffic. Examples may include appending/prepending data with junk characters or writing junk characters between significant characters.</p>
KEV CVEs mapped to this technique · CTID Mappings Explorer
None. No KEV entry in the public mapping names this technique. Given that 74.7% of KEV has no mapping at all, this says more about the mapping than about the technique.
Detection strategy · ATT&CK Enterprise v19.2
- DET0011 Detecting Junk Data in C2 Channels via Behavioral Analysis v1.0
AN0030 WindowsProcesses generating large outbound connections with disproportionate send/receive ratios, often to uncommon ports or hosts, potentially inserting meaningless data into protocol payloads.Tunable:
PayloadEntropyThresholdTimeWindowUserContextAN0031 LinuxOutbound traffic with anomalous payload sizes and patterns from non-networking processes, often observed via packet inspection or connection logs.Tunable:EntropyScoreProcessWhitelistDataRatioThresholdAN0032 macOSPreviously unseen applications generating outbound connections with atypical data flow characteristics, such as excessive data with no return response.Tunable:ParentProcessCheckHostWhitelistAN0033 ESXiAnomalous traffic from ESXi host management daemons (like hostd or vpxa) embedding non-standard payloads in management protocols (e.g., HTTPS) or beaconing behavior.Tunable:TLSFingerprintMismatchUnusualDestinationPorts
Sigma rules · SigmaHQ da9bb07d64, tag attack.t1001.001
No Sigma rule carries this tag. MITRE publishes a detection strategy above, so the behaviour is specified; what is missing is public detection content.