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ESXi Shell Command Obfuscation

Detects ESXi shell commands that rebuild a command with encoding instead of writing it in clear text, including octal and hex `printf`, Python `chr()`, `awk` `%c` sequences, reversed strings, and invisible Unicode.…

Description

Detects ESXi shell commands that rebuild a command with encoding instead of writing it in clear text, including octal and hex `printf`, Python `chr()`, `awk` `%c` sequences, reversed strings, and invisible Unicode. The shell log then hides the administrative command. The decoded action can still change syslog, the firewall, or other host settings.

Detection logic

Its licence does not clear it for publishing here

Sunturai publishes a detection's own text where the licence it arrived under has been reviewed and permits it, and Elastic License 2.0 has not. The query as its source wrote it, its canonical form and the hash that pins this revision are in the workspace record.

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Detection requirements

Platform
ContainersESXiIaaSIdentity ProviderLinuxmacOSNetwork DevicesOffice SuiteSaaSWindows

The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.

Log source category
event_index

Known benign triggers

  • Rare troubleshooting one-liners can use `printf` or `awk` to generate text. A line that also decodes to a syslog, firewall, or VM command should still be investigated.

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