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Based on working hours Israeli is likely

https://rheaeve.substack.com/p/xz-backdoor-times-damned-time...

There are other countries on the same time zone, but only Israel has history of using and selling hacks of this level.

Or someone further west who did this after work during the evenings.

Or someone further east with a classical hacker "let's get up late in the afternoon, and start the serious hacking late at night."

From that article, "To further investigate, we can try to see if he worked on weekends or weekdays: was this a hobbyist or was he paid to do this? The most common working days for Jia were Tue (86), Wed (85), Thu (89), and Fri (79)." That makes it more likely this work was done during working hours; someone doing things outside of work hours would be more likely to produce the same amount (or more) on weekends and holidays.

Yes, that would point towards regular office hours and not hacking hours.

Moscow is the same time zone as Israel.

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