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131 lines
3.6 KiB
131 lines
3.6 KiB
#!/usr/bin/env sh
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#
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# USAGE
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# ./make.sh [Egg-Mark]
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#
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# NOTE
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# Egg-Mark must be a plaintext with 8 bytes in length
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# If Egg-Mark was not specified, the default one will be used.
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#
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# To specify a custom payload, simply modify the code of payload.nasm file.
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# Alternativly, you can modify PAYLOADCODE= variable down below the code.
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#
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ARG1=$1
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if [ -z "$ARG1" ]; then
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echo " [I] Argument not specified. Using default EGG mark."
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ARG1="Egg-Mark";
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elif ! [[ `expr length $ARG1` -ge 8 && `expr length $ARG1` -le 8 ]]; then
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echo " [E] Custom EGG mark must be 8 bytes in length! Exiting."
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exit 1;
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else
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echo " [I] Using custom EGG mark: "$ARG1
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fi
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DEFAULTEGG=($(echo -n "Egg-Mark" | sed -e 's/\(....\)/\1\n/g')) # set in hunter.nasm
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EGGMARK=$ARG1
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NEWEGG=($(echo -n $EGGMARK | sed -e 's/\(....\)/\1\n/g'))
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# Uncomment to save EGGMARK in HEX
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EGGMARK=$(echo -n $ARG1 | od -A n -t x1 |sed 's/ /\\x/g')
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# Cleanup
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rm -f shellcode payload.o payload hunter.o hunter
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echo " [+] Compiling payload.nasm ..."
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nasm -f elf32 -o payload.o payload.nasm
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ld -m elf_i386 -o payload payload.o
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echo " [+] Compiling hunter.nasm ..."
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nasm -f elf32 -o hunter.o hunter.nasm
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ld -m elf_i386 -o hunter hunter.o
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echo " [+] Extracting PAYLOAD code from payload ..."
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PAYLOADCODE=$(objdump -d ./payload |grep '[0-9a-f]:'|grep -v 'file'|cut -f2 -d:|cut -f1-7 -d' '|tr -s ' '|tr '\t' ' '|sed 's/ $//g'|sed 's/ /\\x/g'|paste -d '' -s)
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echo " [+] Adding EGG mark to PAYLOAD ..."
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FULL_PAYLOADCODE=$(echo -n ${EGGMARK}${PAYLOADCODE}|sed 's/^/"/' |sed 's/$/"/g')
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echo " [+] Checking PAYLOAD code for NULLs ..."
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if [[ $FULL_PAYLOADCODE == *00* ]]; then
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echo " [E] Your PAYLOAD code contains 00 (NULL) ! Exiting."
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exit 1
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fi
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echo " [+] Extracting HUNTER code from hunter ..."
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HUNTERCODE=$(objdump -d ./hunter |grep '[0-9a-f]:'|grep -v 'file'|cut -f2 -d:|cut -f1-7 -d' '|tr -s ' '|tr '\t' ' '|sed 's/ $//g'|sed 's/ /\\x/g'|paste -d '' -s|sed 's/^/"/' |sed 's/$/"/g')
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# For debugging only
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#echo ${DEFAULTEGG[0]}
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#echo ${DEFAULTEGG[1]}
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#echo ${NEWEGG[0]}
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#echo ${NEWEGG[1]}
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# Preparing Default egg to HEX form in order to replace it with a New egg
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DEFEGG1=$(echo -n ${DEFAULTEGG[0]} | od -A n -t x1 |sed 's/ /\\x/g'|sed 's/\\/\\\\/g')
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DEFEGG2=$(echo -n ${DEFAULTEGG[1]} | od -A n -t x1 |sed 's/ /\\x/g'|sed 's/\\/\\\\/g')
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# Uncomment to save new EGGMARK in HEX format
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NEWEGG1=$(echo -n ${NEWEGG[0]} | od -A n -t x1 |sed 's/ /\\x/g'|sed 's/\\/\\\\/g')
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NEWEGG2=$(echo -n ${NEWEGG[1]} | od -A n -t x1 |sed 's/ /\\x/g'|sed 's/\\/\\\\/g')
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# Uncomment to save new EGGMARK in Plaintext format
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#NEWEGG1=$(echo -n ${NEWEGG[0]})
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#NEWEGG2=$(echo -n ${NEWEGG[1]})
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FULL_HUNTERCODE=$(echo -n $HUNTERCODE |sed 's/'$DEFEGG1'/'$NEWEGG1'/g'| sed 's/'$DEFEGG2'/'$NEWEGG2'/g')
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echo " [+] Checking HUNTER code for NULLs ..."
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if [[ $FULL_HUNTERCODE == *00* ]]; then
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echo " [E] Your HUNTER code contains 00 (NULL) ! Exiting."
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exit 1
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fi
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# Uncomment to see what will is replaced (default egg with a new one)
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#echo $DEFEGG1
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#echo $DEFEGG2
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#echo $NEWEGG1
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#echo $NEWEGG2
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#echo $HUNTERCODE
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#echo $FULL_HUNTERCODE
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cat > shellcode.c << EOF
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#include <stdio.h>
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#include <string.h>
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unsigned char hunter[] = \
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$FULL_HUNTERCODE;
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unsigned char garbage1[] = \
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"Just some garbage here...";
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unsigned char payload[] = \
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$FULL_PAYLOADCODE;
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unsigned char garbage2[] = \
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"And some garbage there...";
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main()
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{
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printf("Hunter Length: %d\n", strlen(hunter));
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printf("Payload Length: %d\n", strlen(payload));
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int (*ret)() = (int(*)())hunter;
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ret();
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}
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EOF
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echo " [+] Compiling shellcode.c ..."
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gcc -m32 -fno-stack-protector -z execstack shellcode.c -o shellcode
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# Cleanup
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rm -f payload.o payload hunter.o hunter
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ls -la ./shellcode
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echo " [+] All done!"
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