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146.190.23.157 has a very high threat confidence level of 97%, originating from Amsterdam, The Netherlands, on the DigitalOcean, LLC network (14061). It has been observed across 50 sessions targeting SSH, IMAP, with detected attack patterns including ssh hardened host profiling and shell rc immutability bypass, First observed on February 12, 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.