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209.38.21.128 has a very high threat confidence level of 86%, originating from Sydney, Australia, on the DigitalOcean, LLC network (14061). It has been observed across 9 sessions targeting SSH, with detected attack patterns including ssh hardened host profiling and shell rc immutability bypass, First observed on March 10, 2026, most recently active March 10, 2026.
Identifies SSH post-auth activity combining resilient multi-source CPU enumeration (explicit /usr/bin/nproc fallback) with removal of the immutable flag from ~/.shellrc via chattr, indicating host profiling followed by shell configuration tampering for persistence preparation.