The Official Radare2 Book

rafind2

Rafind2 is the command line fronted of the r_search library. Which allows you to search for strings, sequences of bytes with binary masks, etc

$ rafind2 -h

Usage: rafind2 [-mXnzZhqv] [-a align] [-b sz] [-f/t from/to] [-[e|s|S] str] [-x hex] -|file|dir ..

-a [align] only accept aligned hits

-b [size] set block size

-e [regex] search for regex matches (can be used multiple times)

-f [from] start searching from address 'from'

-h show this help

-i identify filetype (r2 -nqcpm file)

-j output in JSON

-m magic search, file-type carver

-M [str] set a binary mask to be applied on keywords

-n do not stop on read errors

-r print using radare commands

-s [str] search for a specific string (can be used multiple times)

-S [str] search for a specific wide string (can be used multiple times). Assumes str is UTF-8.

-t [to] stop search at address 'to'

-q quiet - do not show headings (filenames) above matching contents (default for searching a single file)

-v print version and exit

-x [hex] search for hexpair string (909090) (can be used multiple times)

-X show hexdump of search results

-z search for zero-terminated strings

-Z show string found on each search hit

That's how to use it, first we'll search for "lib" inside the /bin/ls binary.

$ rafind2 -s lib /bin/ls

0x5f9

0x675

0x679

...

$

Note that the output is pretty minimal, and shows the offsets where the string lib is found. We can then use this output to feed other tools.

Counting results:

$ rafind2 -s lib /bin/ls | wc -l

Displaying results with context:

$ export F=/bin/ls

$ for a in `rafind2 -s lib $F` ; do \

r2 -ns $a -qc'x 32' $F ; done

0x000005f9 6c69 622f 6479 6c64 .. lib/dyld........

0x00000675 6c69 622f 6c69 6275 .. lib/libutil.dyli

0x00000679 6c69 6275 7469 6c2e .. libutil.dylib...

0x00000683 6c69 6200 000c 0000 .. lib......8......

0x000006a5 6c69 622f 6c69 626e .. lib/libncurses.5

0x000006a9 6c69 626e 6375 7273 .. libncurses.5.4.d

0x000006ba 6c69 6200 0000 0c00 .. lib.......8.....

0x000006dd 6c69 622f 6c69 6253 .. lib/libSystem.B.

0x000006e1 6c69 6253 7973 7465 .. libSystem.B.dyli

0x000006ef 6c69 6200 0000 0000 .. lib......&......

rafind2 can also be used as a replacement of file to identify the mimetype of a file using the internal magic database of radare2.

$ rafind2 -i /bin/ls

0x00000000 1 Mach-O

Also works as a strings replacement, similar to what you do with rabin2 -z, but without caring about parsing headers and obeying binary sections.

$ rafind2 -z /bin/ls| grep http

0x000076e5 %http://www.apple.com/appleca/root.crl0\r

0x00007ae6 https://www.apple.com/appleca/0

0x00007fa9 )http://www.apple.com/certificateauthority0

0x000080ab $http://crl.apple.com/codesigning.crl0