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213.155.23.172 has a very high threat confidence level of 92%, originating from Ukraine. It has been observed across 19 sessions targeting SSH, with detected attack patterns including ssh hardened host profiling and shell rc immutability bypass, First observed on March 4, 2026, most recently active March 4, 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.