# This script extracts the shellcode from the fake document dropper of the
# latest OceanLotus campaign using the side-loading technique against
# legitimate "rastls.exe" application from Symantec
# Details about OceanLotus can be found at 
# https://www.welivesecurity.com/wp-content/uploads/2018/03/ESET_OceanLotus.pdf
#
# For feedback or questions contact us at: <EMAIL>
# https://github.com/eset/malware-research/
# <NAME> <<EMAIL>>
#
# This code is provided to the community under the two-clause BSD license as
# follows:
#
# Copyright (C) 2018 ESET
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#encoding: utf-8

import sys
import lief
import pylzma
from struct import unpack

if len(sys.argv) != 3:
    print "Usage: script [binary] outputFile"
    exit(-1)

b = lief.parse(sys.argv[1])
key = b.get_section(".data").content[:0x80]
root = b.resources
rcdata = None
for i in root.childs:
    if i.id == 0xa:
        rcdata = i
        break

rsrc = rcdata.childs[0].childs[0].content
compressed = ''
l = len(key)
for i, c in enumerate(rsrc):
    compressed += chr(c ^ key[i % l])
    key[i % l] = c
size = unpack("<I", compressed[4:8])[0]
shellcode = pylzma.decompress(compressed[8:], maxlength=size)

with open(sys.argv[2], "wb") as f:
    f.write(shellcode[8:])

# This script extracts the shellcode from the fake document dropper of the
# latest OceanLotus campaign using the side-loading technique against
# legitimate "rastls.exe" application from Symantec
# Details about OceanLotus can be found at 
# https://www.welivesecurity.com/wp-content/uploads/2018/03/ESET_OceanLotus.pdf
#
# For feedback or questions contact us at: <EMAIL>
# https://github.com/eset/malware-research/
# <NAME> <<EMAIL>>
#
# This code is provided to the community under the two-clause BSD license as
# follows:
#
# Copyright (C) 2018 ESET
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#encoding: utf-8

import sys
import lief
import pylzma
from struct import unpack

if len(sys.argv) != 3:
    print "Usage: script [binary] outputFile"
    exit(-1)

b = lief.parse(sys.argv[1])
key = b.get_section(".data").content[:0x80]
root = b.resources
rcdata = None
for i in root.childs:
    if i.id == 0xa:
        rcdata = i
        break

rsrc = rcdata.childs[0].childs[0].content
compressed = ''
l = len(key)
for i, c in enumerate(rsrc):
    compressed += chr(c ^ key[i % l])
    key[i % l] = c
size = unpack("<I", compressed[4:8])[0]
shellcode = pylzma.decompress(compressed[8:], maxlength=size)

with open(sys.argv[2], "wb") as f:
    f.write(shellcode[8:])

# This script extracts the shellcode from the fake document dropper of the # latest OceanLotus campaign using the side-loading technique against # legitimate "rastls.exe" application from Symantec # Details about OceanLotus can be found at # https://www.welivesecurity.com/wp-content/uploads/2018/03/ESET_OceanLotus.pdf # # For feedback or questions contact us at: <EMAIL> # https://github.com/eset/malware-research/ # <NAME> <<EMAIL>> # # This code is provided to the community under the two-clause BSD license as # follows: # # Copyright (C) 2018 ESET # All rights reserved. # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions are met: # # 1. Redistributions of source code must retain the above copyright notice, this # list of conditions and the following disclaimer. # # 2. Redistributions in binary form must reproduce the above copyright notice, # this list of conditions and the following disclaimer in the documentation # and/or other materials provided with the distribution. # # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. #encoding: utf-8