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Revue de presse francophone :
- CNIL Avis sur la création du fichier des auteurs d'infractions terroristes FIJAIT
- Nuance lance deux nouveaux programmes, à destination de ses partenaires revendeurs de solutions Imaging
- Les services aux citoyens choletais hautement disponibles et sécurisées 24 7 grâce à la virtualisation du SI de la mairie sous DataCore
- Violin Memory engage Amy Love comme Directrice Marketing
- Le cru 2015 de la solution Kaspersky Endpoint Security for Business, destinée aux Entreprises, est arrivé
- Dhimyotis annonce un réseau de 190 distributeurs
- Emmanuelle Weisberg, MALTEM Consulting Group Quand l'évolution des moyens de paiements impose de déployer des systèmes de nouvelle génération
- Return Path révèle que la sécurité des boîtes email mondiales s'intensifie grâce au protocole DMARC
- L'étude mondiale d'Aruba Networks confirme la nécessité d'identifier et d'aider les employés exposés et peu formés à la sécurité pour protéger les données sensibles
- Cloud hybride Equinix va donner accès au vCloud Air Service de VMware sur la plateforme Equinix en Europe
- Vigilance - WordPress PageLines exécution de code, analysé le 23 01 2015
- Vigilance - WordPress Platform exécution de code, analysé le 23 01 2015
- Nouveau Rapport sur les Menaces de F-Secure Alerte sur la croissance des ransomware
- Le nouveau Paragon Partition Manager 15 est désormais disponible en français
- Découvrez la vidéo de CerberHost par NBS System

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 :
- The Ultimate Tool For Homebrew PCB Manufacturing
- Tesla s DNS Hacked Leading to Website and Twitter Hijacks
- Hackers Hijack Wireless Car Keys and Pierce Israeli Military Systems
- The Digistump Oak An ESP8266 On Kickstarter
- Connecticut state law reveals huge extent of data privacy losses
- NC Patient records removed from abandoned Statesville hospital
- FL Numerous skimming devices found on local gas pumps
- Brewdoo Helps Keep the Office Coffee Fresh
- After Aaron s Law reintroduced, new counter-bill aims to crack down on hackers
- 'Wake up, daddy's looking for you' Creepy hacker...
- EEVblog 737 World s Biggest Collection Of Electronics Components
- Think Tanks How a Bill Gates Agenda Becomes a Law
- Adaptive Penetration Testing by Kevin Mitnick Dave Kennedy
- Live from RSA 2015 Security Kahuna Podcast
- RSA 2015 Video Four Cloud Mistakes to Avoid

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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Top bi-hebdo des articles de SecuObs
- How to install USBsploit 0.6 BETA through SVN, the tar.gz, the .run or to work with original Metasploit
- La sécurité des systèmes à base de tags RFID remise en question
- Mises à jour en perspective pour le système Vigik
- [IDS Snort Windows – Partie 2] Installation et configuration
- [Ettercap – Partie 2] Ettercap par l'exemple - Man In the Middle et SSL sniffing
- EFIPW récupère automatiquement le mot de passe BIOS EFI des Macbook Pro avec processeurs Intel
- [(in)Sécurité du protocole HTTPS par Sysun Technologies – partie 1] Introduction à HTTPS
- USBDumper 2 nouvelle version nouvelles fonctions !
- [SecUbuLIVE - Partie 1] Présentation
- IronBee, 150 techniques différentes d'évasion protocolaire pour l'audit automatisé des WAFs

Top bi-hebdo de la revue de presse
- 20 Mai Paris conférence GCIC L'Intelligence Economique d'Entreprise au défi du numérique
- Laurent Roudil nommé Directeur Général Adjoint en charge du Développement d'Econocom-Osiatis
- iPhone Traffic - ZAP ed, Security, and Network Tap Tap Tapping
- Smart City le citoyen est devenu un acteur 2.0 de sa ville
- CanSecWest Vancouver 2015 slides
- WD Purple NV des disques durs de haute capacité pour environnements de vidéosurveillance exigeants
- Another introduction into radare2 PDF
- Vigilance - Annonce de vulnérabilité applicative
- Thoughts on Intel's upcoming Software Guard Extensions Part 2
- Attaque DDoS sur les médias belges et français commentaire de F5 Networks

Top bi-hebdo de l'annuaire des videos
- An Tool to analyse tcpdump of Bit torrent and HTTP protocols
- pfSense Quick Look Firewall Content Filter Block Porn Web Proxy Cache
- BackTrack 5 Ataque DDoS SynFlood Metasploit msf console V3NEN0
- Official Maltego tutorial 3 Importing CSVs spreadsheets
- install zeus botnet
- Comment creer un server botnet!!!!(Réseau de pc zombies)
- Win32 SMB Conficker Removal Tool
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- Install IPA using SSH vShare on iPhone iDevices
- Avoir des donuts illimit s sur le jeu Simpsons Springfield

Top bi-hebdo de la revue Twitter
- Newly discovered zero-day exploit bypasses UAC in Windows (bug in win32k.sys)
- Cisco's 2009 Annual Security Report - - (NB: I am emp by Cisco)
- RT @id084895: PBX #hacking moves into the professional domain as arrests stack up (a golden oldie #security)
- crack.pl: md5/sha1 cracker/ rainbowtable generator
- RT @nickhacks: Want to crash a remote host running Snow Leopard? Just use: nmap -P0 -6 --script=targets-ipv6-multicast-mld #wishiwaskidding
- RT @purehate_: ZOMG!!!! Another Backtrack 0 day
- Installed VMware Server 2.02 on top of Ubuntu Server Edition 9.10 x64.... did need help from here:
- RT @WTFuzz: I just wrote a (rather lengthy) blog post on a few java vulnerabilities, patched in java 1.6.19. Feel f ...
- RT @b3h3m0th: [pdf] Kernel Hacking; Introduction to Linux Kernel 2.6How to write a Rootkit (very good work)
- PinkiePie Strikes Again, Compromises Google Chrome in Pwnium Contest at Hack in the Box: For the second time thi...

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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