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generateYara.sh A script to automatically generate Yara rule using Binlex (https://github.com/c3rb3ru5d3d53c/binlex)
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#!/bin/bash | |
## | |
## Script to automatically generate Yara rule using Binlex (https://github.com/c3rb3ru5d3d53c/binlex). | |
## It will output a .yar file suitable to be loaded on yaraify. | |
## | |
## Usage: | |
## | |
## ./generateYara.sh "RUNELANE" "FILEPATH" "TYPE" "NTRAITS" | |
## Parameters: | |
## RULENAME the name of the rule | |
## FILEPATH the file path | |
## TYPE type of file, one of elf:x86 elf:x86_64 pe:x86 pe:x86_64 raw:x86 raw:x86_64 raw:cil pe:cil auto . | |
## NTRATIS number of binlex's traits to consider for yara rule generation | |
## | |
#!/bin/bash | |
tmpf=$(mktemp) | |
author="$(whoami)" | |
tlp="CLEAR" | |
uuid="$(uuidgen -r)" | |
toptraits="$4" | |
ftype="$3" | |
fpath="$2" | |
name="$1" | |
hashh="$(md5sum "${fpath}"|awk '{print $1}')" | |
if [ -z "${toptraits}" ]; then | |
toptraits="10" | |
fi | |
if [ -z "${ftype}" ]; then | |
ftype="auto" | |
#elf:x86 elf:x86_64 pe:x86 pe:x86_64 raw:x86 raw:x86_64 raw:cil pe:cil auto | |
fi | |
echo "[+] generating yara \"${name}_${uuid}.yar\" for file \"${fpath}\" (t:${ftype},n:${toptraits},h:${hashh})" >&2 | |
binlex -m "${ftype}" -i "${fpath}" | jq -r "select(.size > 16 and .size < 32) | .trait" | head -n "${toptraits}" | blyara --name "${name}" -m "date" "$(date -I)" -m "yarahub_uuid" "${uuid}" -m "yarahub_license" "CC0 1.0" -m "yarahub_rule_matching_tlp" "${tlp}" -m "yarahub_rule_sharing_tlp" "${tlp}" -m "yarahub_reference_md5" "${hashh}" -m "author" "${author}" -m "tlp" "${tlp}" -m "hash_md5" "${hashh}" -c "$( echo "${toptraits} / 2" | bc )" | tee "${name}_${uuid}.yar" |
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