У этого хеша либо соль должна быть либо это какая то своя кодировка. Ни один не подошёл из этих
hashcat --identify 2531fb7a22e6fbc566f66e2834892c4060617242
The following 7 hash-modes match the structure of your input hash:
# | Name | Category
======+============================================================+======================================
100 | SHA1 | Raw Hash
6000 | RIPEMD-160 | Raw Hash
170 | sha1(utf16le($pass)) | Raw Hash
4700 | sha1(md5($pass)) | Raw Hash salted and/or iterated
18500 | sha1(md5(md5($pass))) | Raw Hash salted and/or iterated
4500 | sha1(sha1($pass)) | Raw Hash salted and/or iterated
300 | MySQL4.1/MySQL5 | Database Server
SHA-1 [HC: 100] [JtR: raw-sha1]
RIPEMD-160 [HC: 6000] [JtR: ripemd-160]
Double SHA-1 [HC: 4500]
Haval-160 (3 rounds) [JtR: dynamic_190]
Haval-160 (4 rounds) [JtR: dynamic_200]
Haval-160 (5 rounds) [JtR: dynamic_210]
HAS-160
LinkedIn [HC: 190] [JtR: raw-sha1-linkedin]
Skein-256(160)
Skein-512(160)
Ruby on Rails Restful Auth (one round, no sitekey) [HC: 27200]
MySQL5.x [HC: 300] [JtR: mysql-sha1]
MySQL4.1 [HC: 300] [JtR: mysql-sha1]
Umbraco HMAC-SHA1 [HC: 24800]