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Monnappa K A
 Member of Cysinfo
 Info Security Investigator @ Cisco
 Focus on Threat Intelligence
 Reverse Engineering, Malware Analysis, Memory Forensics
 Email: monnappa22@gmail.com
 Twitter: @monnappa22
 Blog: http://malware-unplugged.blogspot.in
 Linkedin: http://in.linkedin.com/pub/monnappa-ka-grem-ceh/42/45a/1b8
 Why Malware Analysis?
 Types of Malware Analysis
 Static Analysis
 Dynamic Analysis
 Memory Analysis
 Demo
www.SecurityXploded.com
To determine:
 the nature and purpose of the malware
 Interaction with the file system
 Interaction with the registry
 Interaction with the network
 Identifiable patterns
www.SecurityXploded.com
 Static Analysis
- Analyzing without executing the malware
 Dynamic Analysis
- Analyzing by executing the malware
 Memory Analysis
- Analyzing the RAM for artifacts
www.SecurityXploded.com
www.SecurityXploded.com
Static Analysis
Steps:
 Determine the file type
tools: file utility on unix and windows (need to install)
 Determine the cryptographic hash
tools: md5sum utility on unix and windows (part of unix utils for windows)
 Strings search
tools: strings utility on unix and windows , Bintext
 File obfuscation (packers, cryptors and binders) detection
tools: PEiD, RDG packer detector
 Submission to online antivirus scanners (virustotal, jotti, cymru)
tools: browser and public api of Virustotal
 Determine the Imports
tools: PEview, Dependency Walker
 Disassembly
tools: IDA Pro, Ollydbg
Involves executing the malware in a controlled environment to determine its behaviour
Steps:
 Determine the File system activity
tools: process monitor, capturebat
 Determine the Process activity
tools: process explorer, process monitor, capturebat
 Determine the Network activity
tools: wireshark
 Detemine the Registry activity
tools: regmon, process monitor, capturebat
www.SecurityXploded.com
Finding and extracting artifacts from computer’s RAM
 Determine the process activity
 Determine the network connections
 Determine hidden artifacts
 Detemine the Registry activity
Tools:
Volatility (Advanced Memory Forensic Framework)
Advantages:
 helps in rootkit detection
 helps in unpacking
www.SecurityXploded.com
www.SecurityXploded.com
The below screenshot shows the md5sum of the sample
www.SecurityXploded.com
PEiD was unable determine the packer
www.SecurityXploded.com
Dependency Walker shows the DLLs and API used by malicious executable
www.SecurityXploded.com
VirusTotal results show that this sample is a zeus bot (zbot)
www.SecurityXploded.com
Before executing the malware, montioring tools are run to capture the activities of the malware
www.SecurityXploded.com
Internet services are simulated to give fake response to malware and also to prevent malware from
talking out on the internet
www.SecurityXploded.com
www.SecurityXploded.com
The below results show the process, registry and fileystem activity after executing the malware (edd94.exe), also
explorer.exe performs lot of activity indicating code injection into explorer.exe
www.SecurityXploded.com
The below results show the malware dropping a file raruo.exe and creating a process.
www.SecurityXploded.com
The below output shows explorer.exe setting a value under run registry subkey as a persistence
mechanism to survive the reboot.
www.SecurityXploded.com
Packet capture shows dns query to users9.nofeehost.com and also response shows that the “A” record
for the domain is pointed to the machine 192.168.1.2, which is simulating internet services.
www.SecurityXploded.com
The below output shows zeus bot trying to download configuration file from C&C and also the fake
response given by the inetsim server.
www.SecurityXploded.com
ZueS Tracker shows that the domain was a ZeuS C&C server
www.SecurityXploded.com
Suspending the VM creates a memory image of the infected machine, the below screenshot show the
memory image (infected.vmem) of the infected machine
www.SecurityXploded.com
Volatility’s pslist module shows the two process edd94.exe and raruo.exe
www.SecurityXploded.com
Volatility’s connscan module shows pid 1748 making http connection, this pid 1748 is associated with
explorer.exe
www.SecurityXploded.com
The below output shows the inline api hooks and embedded executable in explorer.exe, and also the
embedded executable is dumped into a directory (dump) by malfind plugin
www.SecurityXploded.com
The virustotal submission confirms the dumped exe to be component of ZeuS bot
www.SecurityXploded.com
Malware creates registry key to survive the reboot
www.SecurityXploded.com
Finding malicious sample (raruo.exe) from infected host and virustotal submission confirms ZeuS(zbot) infection
Basic malware analysis

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