Written from engagements

Field Notes.

What the work actually looks like.

Written for the person who has to do the work. Structures on disk, what the artifacts actually prove, and where the usual answer is wrong. Every claim here can be reproduced on a machine you control.

RSS

2023-03-14

DFIR / LINUX / EXT4 / TIMESTAMPS

12 MIN READ

Reading Linux timestamps: what MACB actually means on ext4

Four letters, the same four you use on Windows, and almost every instinct you carry over is wrong. Access is usually not recorded, creation is not in the standard, and the one field an attacker cannot set is the one nobody looks at.

2020-06-11

DFIR / NTFS / TIMESTAMPS / TIMESTOMPING

9 MIN READ

What file timestamps mean, and how to catch tampering

The same four times are stored more than once, and only one copy can be reached by the documented API. That asymmetry is the tell. Knowing the benign explanation for every tell is the rest of the answer.

2019-12-10

DFIR / NTFS / DATA RECOVERY

9 MIN READ

Revised Sep 2026
What really happens when a file is deleted

The million dollar question of any DFIR interview, answered properly: every structure that changes, where the evidence survives, and the three places the standard answer is wrong.

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