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@NTXISSA			#NTXISSACSC4
The	Art	of	Evading	Antivirus
Quentin	Rhoads-Herrera
Security	Analyst
State	Farm
9/28/2016
@NTXISSA			#NTXISSACSC4
Background
• Worked	in	the	following	roles:
• System	administrator
• Developer	(.net /	mobile)
• Regulatory/compliance	analyst
• Security	Analyst
• Pentesting	Hobbyist	J
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2016 2
@NTXISSA			#NTXISSACSC4
The	Problem
• Pen-testers	are	caught	by	antivirus	
programs.
• Antivirus	programs	catch	stock	Metasploit	
payloads.
• Malicious	malware	creators	have	already	
solved	this	problem.
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 3
@NTXISSA			#NTXISSACSC4
How	Antivirus	Works
• Signature-based	detection
• Heuristic-based	detection
• Behavioral-based	detection
• Sandbox	detection
• Data	mining	techniques
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 4
@NTXISSA			#NTXISSACSC4
Is	Antivirus	Dead?
• In	2014	the	senior	vice	president	of	
Symantec	Brian	Dye	declared	to	the	Wall	
Street	Journal	that	antivirus	“is	dead.”	– Brian	Dye,	
Senior	Vice	President,	Symantec
Source:	
http://online.wsj.com/news/article_email/SB1000142405270230341710457954214
0235850578-lMyQjAxMTA0MDAwNTEwNDUyWj
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 5
@NTXISSA			#NTXISSACSC4
Is	Antivirus	Dead?
• “Relying	solely	on	antivirus	is	a	dead	end-
and	it	has	been	for	at	least	8	years	now.	But	
that’s	like	saying	that	aspirin	is	dead	
because	it’s	not	the	cure	for	cancer,	AIDS,	
and	all	of	humanity's	other	illnesses.”	–Bogdan
Domitru,	Chief	Technology	Officer,	Bitdefender
Source:	http://securitywatch.pcmag.com/security/
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 6
@NTXISSA			#NTXISSACSC4
Evading	Antivirus	Ways
• Changing	the	signature
• Encode	(A	LOT)
• Encrypt
• Leverage	your	own	executable,	or	one	that	is	
already	trusted	by	Windows	(notepad.exe)
• Veil-Framework
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 7
@NTXISSA			#NTXISSACSC4
The	Veil-Framework
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 8
@NTXISSA			#NTXISSACSC4
HD	Moore
• “The	strongest	case	for	information	
disclosure	is	when	the	benefit	of	releasing	
the	information	outweighs	the	possible	risks.	
In	this	case,	like	many	others,	the	bad	guys	
already	won.”	– HD	Moore
Source:	
https://community.rapid7.com/community/metasploit/blog/2009/02/23/the-best-
defense-is-information
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 9
@NTXISSA			#NTXISSACSC4
Checking	your	Payloads
• Virustotal is	a	website	that	allows	you	to	
check	how	successful	your	payload	is	when	
evading	antiviruses.
• Antivirus	vendors	receive	information	about	
what	was	uploaded	to	Virustotal.
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 10
@NTXISSA			#NTXISSACSC4
Virustotal
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 11
Source:	https://www.virustotal.com/
@NTXISSA			#NTXISSACSC4
Meterpreter is	Caught
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 12
@NTXISSA			#NTXISSACSC4
Encoded	Meterpreter
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 13
@NTXISSA			#NTXISSACSC4
The	Veil	Way
• The	Veil	hash	check	method!!!	(Really	slick)
• Recommended	to	check	the	hash	which	is	
located	at	/veil/output/hashes	through	the	API	
on	virustotal instead	of	submitting	files.
• checkvt will	spawn	all	hashes	and	check	via	API	
with	Virustotal.
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 14
@NTXISSA			#NTXISSACSC4
Demo
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 15
@NTXISSA			#NTXISSACSC4
When	it	is	Caught
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 16
@NTXISSA			#NTXISSACSC4
Veil-Evasion
• Integrated	with	Metasploit
• Leverages	encryption	(AES	encrypted	
shellcode)
• Can	leverage	your	own	payloads
• Uses	non-standard	languages	for	Windows	
binaries
• Can	integrate	into	your	own	project
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 17
@NTXISSA			#NTXISSACSC4
Languages	Used
• Python
• Perl
• PowerShell
• C	
• C#
• Go
• Ruby
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 18
@NTXISSA			#NTXISSACSC4
Shellcodes
• Void	Pointer	casting:
• Not	a	guarantee	that	your	shellcode	will	drop	
into	executable	memory.
• Virtual	Alloc:
• Allocates	memory	(shellcode	size)
• Determines	permissions	needed
• HeapAlloc:
• Manually	drop	shellcode
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 19
@NTXISSA			#NTXISSACSC4
DEMO
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 20
@NTXISSA			#NTXISSACSC4
Veil-Ordnance
• Generates	shellcode	that	can	be	copied	into	
your	payload.
• Created	due	to	shellcode	being	“broken”	
when	leveraging	msfvenom making	a	non-
working	payload.
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 21
@NTXISSA			#NTXISSACSC4
Veil-Ordnance
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 22
@NTXISSA			#NTXISSACSC4
Veil-Catapult
• Payload	Delivery	tool
• Payloads:
• PowerShell
• Barebones	Python
• Sethc backdoor
• Can	auto	spawn	the	Metasploit	handler	
script.
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 23
@NTXISSA			#NTXISSACSC4
DEMO
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 24
@NTXISSA			#NTXISSACSC4
How	to	Stop	Veil
• API	Scanners	(Ambush	IPS)
• Predictable	Behaviors
• Enhanced	Mitigation	Experience	Toolkit	
(EMET)
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 25
@NTXISSA			#NTXISSACSC4
Other	AV	Evading	Tools
• Hyperion:	This	is	used	to	encrypt	the	binary
• peCloak:	Automated	tool	that	attempts	
multiple	tricks	to	evade	antiviruses
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 26
@NTXISSA			#NTXISSACSC4
Q&A
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2106 27
@NTXISSA			#NTXISSACSC4@NTXISSA			#NTXISSACSC4
The Collin College Engineering Department
Collin College Student	Chapter	of	the	North	Texas	ISSA
North	Texas	ISSA	(Information	Systems	Security	Association)
NTX	ISSA	Cyber	Security	Conference	– October	7-8,	2016 28
Thank	you

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