Security Bulletin

Security Bulletin #115 – 29 May 2017

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2017 / 05 / 29

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Houdini Worm Gets Posted to Paste Sites


Also known as H-Worm, Houdini has been around since 2013, and was said in 2014 to have been created by Naser Al Mutairi from Kuwait. Later that year, the malware was reportedly used in APT campaigns in the Asia-Pacific region, while last year it was associated with the Moonlight espionage campaign targeting the Middle East. Earlier this year, after noticing an increase in malicious Visual Basic scripts (VBscript) posted on paste sites, Recorded Future had a closer look into the matter and discovered that most of the scripts were Houdini. Moreover, a single actor was found to be partially responsible for the identified malicious VBscripts posted on said sites. Analysis of the script variants revealed not only that they could connect to the defined command and control (C&C) server, but also that, after establishing connection, the malware would copy itself to a directory and then create a registry key in a startup location to achieve persistence. Further analysis revealed that the domains and subdomains used are from a dynamic DNS provider, and that some of the active malware samples would communicate to at least one of the paste sites, in addition to the host defined in one of the VBscript.

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Study: Organizations Concerned About Medical Device Attacks


The study, based on a survey of 550 individuals conducted by the Ponemon Institute, shows that 67 percent of medical device makers and 56 percent of HDOs believe an attack on the medical devices they build or use is likely to occur in the next 12 months. In fact, roughly one-third of respondents said they were aware of cyber incidents that had a negative impact on patients, including inappropriate therapy or treatment delivery, ransomware attacks, denial-of-service (DoS) attacks, and hijacking of medical devices. On the other hand, only 17 percent of device manufacturers and 15 percent of HDOs have taken significant steps to prevent attacks. Roughly 40 percent on both sides admitted that they haven’t done anything to prevent attacks. Only 25 percent of device makers and 38 percent of HDOs are confident that the security mechanisms built inside devices can adequately protect patients and the clinicians who use these systems. While mobile devices help clinicians be more efficient, approximately half of respondents believe that their use in hospitals and other healthcare organizations significantly increases security risks. The survey showed that many focus on security requirements instead of more efficient practices, such as security testing throughout the development lifecycle, code review, and dynamic testing.

Researchers Release Patch for NSA-linked ``EsteemAudit`` Exploit


Dubbed EsteemAudit, this exploit targets a remote desktop protocol (RDP) bug and can be abused to move laterally within a compromised organization’s network, as well as to infect victims with ransomware or backdoors, or to exfiltrate sensitive information. EsteemAudit only works on Windows XP and Windows Server 2003, which supposedly limits its overall impact. However, this also means that an official patch is unlikely to arrive from Microsoft, as it no longer offers support for these platform iterations. Because of that, enSilo decided to release a persistent patch for these systems and keep users safe from attacks possibly leveraging the exploit. The decision was fueled by the fact that Installing this patch, however, doesn’t render Windows XP or Server 2003 systems fully secure, as hundreds of other vulnerabilities impacting them still exist and will never be patched. This patch resolves only the vulnerability exploited by EsteemAudit and works on both x86 and x64 platform versions. A large number of machines continue to use Windows XP and Server 2003. The patch is available for download on enSilo’s website and is installed by an installation program after accepting the terms of usage. Uninstallation is supported by signaling an event (which will remove the patch in memory) and unregistering the patch from loading into subsequent RDP sessions.

CERT-FR Weekly News Alert

Current Alerts CERTFR-2017-ALE-008           : Multiples vulnérabilités dans Microsoft Windows XP et Windows Server 2003 (15 mai 2017) Link: http://cert.ssi.gouv.fr/site/CERTFR-2017-ALE-008.pdf CERTFR-2017-ALE-011           : Campagne de messages électroniques non sollicités de type Jaff (14 mai 2017) Link: http://cert.ssi.gouv.fr/site/CERTFR-2017-ALE-011.pdf CERTFR-2017-ALE-010           : Propagation d’un rançongiciel exploitant les vulnérabilités MS17-010 (12 mai 2017) Link: http://cert.ssi.gouv.fr/site/CERTFR-2017-ALE-010.pdf