/etc/Crack/rules.prefixu is in crack-common 5.0a-9.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | # People prefixing passwords with numbers is quite a lot rarer than
# suffixing numbers. Oh well, let's nail the buggers anyway...
!?Au^0
!?Au^1
!?Au^2
!?Au^3
!?Au^4
!?Au^5
!?Au^6
!?Au^7
!?Au^8
!?Au^9
!?Au^!
!?Au^.
!?Au^?
!?Au^ :
# trailing colon (no-op) on last line delimits space character.
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