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Revue de presse francophone :
- Cyber-protection des réseaux les équipes commerciales et le management sont de plus en plus exposés aux attaques alors que moins de 50 pourcents sont formés à la cybersécurité
- Vigilance - busybox contournement du filtre de modprobe, analysé le 18 06 2015
- Ercom recrute un Ingénieur développement Android - Ref SE-2015-1
- Ercom recrute un Ingénieur Avant-Vente - Ref CO-2015-2
- Vigilance - Cisco Adaptive Security Appliance absence de contrôle d'intégrité de flux IPsec, analysé le 18 06 2015
- Vigilance - Wireshark deux vulnérabilités, analysé le 18 06 2015
- ATHENA Global Services recherche des Commerciaux H F
- Zscaler nommé leader de la sécurité du Web en mode SaaS par l'un des principaux cabinets d'analystes indépendants
- Gilles Knoery, Directeur Général et co-fondateur de Digora Comment résoudre le paradoxe du cloud
- Spie vers une approche fonctionnelle et globale de la sécurité
- Hack in Paris 2K15, exploits sportifs et numériques
- Econocom-Osiatis recrute un Consultant Sécurité IAM H F
- Econocom-Osiatis recrute un Ingénieur, Consultant Sécurité S.I.E.M H F
- Conférence Qui Grok Grehack en groupe agrée
- Hack in Paris 2K15 C est par ici Siri, qui parle là aussi

Dernier articles de SecuObs :
- Renaud Bidou (Deny All): "L'innovation dans le domaine des WAFs s'oriente vers plus de bon sens et d'intelligence, plus de flexibilité et plus d'ergonomie"
- Mises à jour en perspective pour le système Vigik
- Les russes ont-ils pwn le système AEGIS ?
- Le ministère de l'intérieur censure une conférence au Canada
- Saut d'air gap, audit de firmware et (in)sécurité mobile au programme de Cansecwest 2014
- GCHQ: Le JTRIG torpille Anonymous qui torpille le JTRIG (ou pas)
- #FIC2014: Entrée en territoire inconnu
- Le Sénat investit dans les monnaies virtuelles
- #LPM2013: Un nouvel espoir ?
- L'ANSSI durcit le ton

Revue de presse internationale :
- Hacklet 54 Virtual Reality Projects
- MI Around 85K affected in FireKeepers Casino data breach
- FBI Wants Pirate Bay Logs to Expose Copyright Trolls
- Astronaut Or Astronot Win 1000 For Clicking A Button
- Best OpenVPN
- Rhode Island Governor signs new comprehensive Identity Theft Protection Act
- MasterCard Wants To Scan Your Face
- Restricting the rights of PowerShell users with a constrained session configuration
- A short video explaining how to make online poker more secure
- ScratchABit v0.5 - Open-source interactive disassembler with IDAPython plugin support
- The last seconds are ticking off the U.S. IPv4 network clock
- Security News This Week Your VPN Probably Isn't Private
- Akamai Identifies Old Protocol in New DrDoS Attacks
- Samsung Faces Lawsuit In China Over Smartphone Bloatware
- Arduinos and other AVRs Write To Own Flash

Annuaire des videos
- FUZZING ON LINE PART THREE
- Official Maltego tutorial 5 Writing your own transforms
- Official Maltego tutorial 6 Integrating with SQL DBs
- Official Maltego tutorial 3 Importing CSVs spreadsheets
- install zeus botnet
- Eloy Magalhaes
- Official Maltego tutorial 1 Google s websites
- Official Maltego tutorial 4 Social Networks
- Blind String SQL Injection
- backdoor linux root from r57 php shell VPS khg crew redc00de
- How To Attaque Pc With Back Track 5 In Arabique
- RSA Todd Schomburg talks about Roundup Ready lines available in 2013
- Nessus Diagnostics Troubleshooting
- Panda Security Vidcast Panda GateDefender Performa Parte 2 de 2
- MultiPyInjector Shellcode Injection

Revue Twitter
- RT @fpalumbo: Cisco consistently leading the way ? buys vCider to boost its distributed cloud vision #CiscoONE
- @mckeay Looks odd... not much to go on (prob some slideshow/vid app under Linux)
- [SuggestedReading] Using the HTML5 Fullscreen API for Phishing Attacks
- RT @BrianHonan: Our problems are not technical but cultural. OWASP top 10 has not changed over the years @joshcorman #RSAC
- RT @mikko: Wow. Apple kernels actually have a function called PE_i_can_has_debugger:
- [Blog Spam] Metasploit and PowerShell payloads
- PinkiePie Strikes Again, Compromises Google Chrome in Pwnium Contest at Hack in the Box: For the second time thi...
- @mikko @fslabs y'all wldn't happen to have lat/long data sets for other botnets, wld you? Doing some research (free/open info rls when done)
- RT @nickhacks: Want to crash a remote host running Snow Leopard? Just use: nmap -P0 -6 --script=targets-ipv6-multicast-mld #wishiwaskidding
- An inexpensive proxy service called is actually a front for #malware distribution -

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Revue de presse : security, microsoft, windows, hacker, attack, network, vulnerability, google, exploit, malware, internet, remote, iphone

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Annuaires des videos : curit, security, biomet, metasploit, biometric, cking, password, windows, botnet, defcon, tutorial, crypt, xploit

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Revue Twitter : security, linux, botnet, attack, metasploit, cisco, defcon, phish, exploit, google, inject, server, firewall

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Top bi-hebdo des articles de SecuObs
- [Infratech - release] version 0.6 de Bluetooth Stack Smasher
- HIDIOUS, une librairie d'injection de frappes clavier compatible Arduino et Teensy
- [Ettercap – Partie 1] Introduction et rappels
- [Ettercap – Partie 2] Ettercap par l'exemple - Man In the Middle et SSL sniffing
- OSSTMM une méthodologie Open Source pour les audits de sécurité
- Mises à jour en perspective pour le système Vigik
- EFIPW récupère automatiquement le mot de passe BIOS EFI des Macbook Pro avec processeurs Intel
- USBDumper 2 nouvelle version nouvelles fonctions !
- [Infratech - vulnérabilité] Nouvelle version 0.8 de Bluetooth Stack Smasher
- [IDS Snort Windows – Partie 2] Installation et configuration

Top bi-hebdo de la revue de presse
- Cridex Analysis using Volatility - by Andre' DiMino - samples and memory analysis resources
- Thoughts on Absolute Computrace
- A2COM-Groupe Resadia devient Hébergeur Agréé de Données de Santé
- 4 moyens pour se protéger contre la cybercriminalité
- Thomas Fillaud, ANSSI l'ANSSI soutient les industriels français de confiance sur Infosecurity Europe
- Hack Kaspersky, une leçon pour l Anses et l Anssi
- Les FortiManager-VM et FortiAnalyzer-VM sont disponibles pour Amazon Web Services AWS
- Titan Datacenter annonce la création d'un Datacentre de nouvelle génération
- La reprise de NextiraOne France par Butler Industries confirmée
- Norton by Symantec publie une nouvelle analyse sur Dyre

Top bi-hebdo de l'annuaire des videos
- PfSense Packages Pfblocker Installation and Configuration
- Cythosia Botnet Secondlife Grind DDoS
- Tutoriel Supprimer Cacaoweb Botnet
- kali linux Collecte d adresses Email avec Metasploit
- Avoir des donuts illimit s sur le jeu Simpsons Springfield
- Metasploit WMAP Web Vulnerability Scanner
- Tutorial 15 pfSense Squid Squidguard Content filtering
- crypt server njrat darkcomet bifrost xtremrat spynet zeus botnet
- FUZZING ON LINE PART THREE
- Utilisation de WIRESHARK pour retrouver un mot de passe

Top bi-hebdo de la revue Twitter
- DNSdelve: framework to list, query zones delegated by a registry #infosec #cybercrime bit.ly/mOew7L
- RT @r0bertmart1nez: RT @Foundstone FreeRADIUS-WPE updated! -
- The Markle-Daamgard padding is different on mexican MD5, so it can't be made constant time unless you JIT.
- Is anyone else frustrated by the interface for Python's namedtuple?
- NMAP has been updated with the latest VMware ESX OS detection and correct IEEE/OUI spelling for MAC/ARP addresses Yippee!
- Released pvefindaddr v2.0.13 - - minor updates
- RT @b3h3m0th: [pdf] Kernel Hacking; Introduction to Linux Kernel 2.6How to write a Rootkit (very good work)
- Sexy piece of work at milw0rm - YourTube = 2.0 Remote SQL Database Disclosure -
- RT @inj3ct0r: [remote exploits] - Sysax 5.53 SSH Username Buffer Overflow Exploit
- RT @WTFuzz: I just wrote a (rather lengthy) blog post on a few java vulnerabilities, patched in java 1.6.19. Feel f ...

Top des articles les plus commentés
- [Metasploit 2.x – Partie 1] Introduction et présentation
- Microsoft !Exploitable un nouvel outil gratuit pour aider les développeurs à évaluer automatiquement les risques
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- Les navigateurs internet, des mini-systèmes d’exploitation hors de contrôle ?
- Yellowsn0w un utilitaire de déblocage SIM pour le firmware 2.2 des Iphone 3G
- CAINE un Live[CD|USB] pour faciliter la recherche légale de preuves numériques de compromission
- Nessus 4.0 placé sous le signe de la performance, de l'unification et de la personnalisation
- [Renforcement des fonctions de sécurité du noyau Linux – Partie 1] Présentation
- [IDS Snort Windows – Partie 1] Introduction aux IDS et à SNORT
- Origami pour forger, analyser et manipuler des fichiers PDF malicieux

Network Antivirus Evasion with XOR

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Network Antivirus Evasion with XOR

Par Technicalinfo.net Blog
Le [2012-03-22] à 16:17:32



Présentation : Many organizations I speak with have instigated network filtering and security monitoring solutions targeted at identifying malicious binaries traversing their egress points. Something that they ve been observing in recent months is the increase of suspicious binaries that are unsupported and non-executable. Ordinarily any intercepted binaries would be farmed off to static anti-virus scanners or tin-wrapped behavioral analysis engines for classification however a growing volume of these binaries cannot be scanned or executed within virtual environments. What s going on More often than not, these perimeter network defenses are encountering encoded and obfuscated malicious binaries constructed purposefully by an attacker to bypass network threat detection products. These evasions aren t anything new, it s just that the tools and functionality to encode malicious binaries on-the-fly have become standard features in a growing number of automated attack delivery tools and DIY botnet construction kits. The non-executable binaries are typically malicious binaries that have been encoded using simple, light weight, cryptographic techniques. They need to be decoded at the receivers end and decrypted back in to their original file format for proper malicious execution. In many cases the entire original malicious binary is encrypted using a simple XOR cipher. While there are no shortage of techniques that can be used take a look at the default assortment of file encoders within the Metasploit MSFencode module for instance , XOR does seem popular and is more than good enough to bypass existing security technologies. Sometimes the simplest evasion techniques are the best. Just to be clear though, we re talking about malicious binaries that have been fully encrypted and require a separate application or script running on the victim s computer to decrypt them i.e. they cannot be executed by themselves not executable binaries that have been armored for local anti-virus evasion purposes and are shipped in an already executable format. There s a very nice walk through of manually armoring files for the purpose of evading local host inspection of malicious binaries in Bypassing Anti-Virus Scanners , and there s a good discussion of using Metasploit to construct evasive executable content over on offensive-security.com for comparisons sake. The non-executable encrypted binaries are typically either droppers for newly compromised victims, or malicious updates for existing victim installations. In the case of newly compromised victims, the encrypted malicious binary will be requested by the attacker s payload e.g. shell script and decrypted in memory before being installed on the victim. For existing victims, the encrypted binary will be requested by an already installed malware component, decrypted, and used to replace existing components of the malware installation. There are other permutations to the theme as well. For example, the use of malicious Adobe Flash files that serve as the transport instigator for the malicious commands such as the imm32.dll dissected by Stop Malvertising, or the use of PNG files to propagate XOR ed malware. What does this mean for automated network-based anti-virus solutions such as Norman, Trend Micro, etc. and auto-signature-creator anti-virus products such as FireEye, Palo Alto Networks Wildfire, etc. Since the intercepted binary is incapable of execution by itself and will never run under an emulated or virtualized behavioral system, it will not be automatically analyzed or classified as malicious. Only the targeted victim will uncover the unsavory payload. Because the technique works so well and is so easy to do, we can expect the trend to continue. Organizations will capture more and more suspicious non-executable binaries going forward often containing little or no hint as to what the file may potentially be . What can be done I believe a key perspective to dealing with this evasion technique is to better understand the suspicious nature of the file transfer. Consider it contextual awareness . Despite not being able to dissect and analyze the malicious binary directly, understanding the context of its transport will likely provide enough circumstantial evidence to arrive at a comfortable conclusion as to the maliciousness of the binary. For example What is the reputation of the file download source E.g. a corporate entity, file sharing site, hacker forum Is the source known to only host malware e.g. malicious files are encountered there frequently Is the file requester already known to be infected e.g. the requester is a known botnet victim Is there a cyclic pattern to the download file requests indicative of previous compromise e.g. an existing malware installation is requesting new updates What is the nature of the source e.g. the hosting server is a known C C server What are the ports and protocols involved e.g. HTTP over a low non-TCP80 port number What are the parameters of the file e.g. the file is not readable by any commonly installed applications on the destination host, and is approximately the same size are regularly encountered malware samples At the end of the day, the attackers have the upper-hand when it comes to obfuscating malicious binaries. The increased application of XOR ciphers designed to evade network-based binary inspection tools and appliances makes sense, and is more than sufficient to thwart these protection technologies. In that case, it makes increasing sense to look for other network artifacts that can hint at the suspiciousness of the binaries makeup and to use that contextual awareness to decide upon an automated defense reaction.

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