Trend micro anti mallware update9/21/2023 ![]() ![]() These files are placed in the %SystemRoot%\System32\drivers directory. The mrxnet.sys driver works as a file system filter driver, and mrxcls.sys is used to inject malicious code. the malware drops and executes two driver files: mrxnet.sys and mrxcls.sys. For Windows 7 systems, AutoPlay functionality for removable disks is automatically disabled.īased on current reporting,VirusBlokAda,, website last visited July 15, 2010. For systems that have AutoPlay disabled, customers would need to manually browse to the root folder of the removable disk in order for the vulnerability to be exploited. This vulnerability is most likely to be exploited through removable drives. While Microsoft’s advisory indicates user’s need to click an icon for the vulnerability to be executed, VirusBlokAda reports these malicious shortcut files are capable of executing automatically (without user interaction) if accessed by Windows Explorer. A shortcut will not execute until a user clicks on its icon. Shortcut files are Windows files that link easy-to-recognize icons to specific executable programs, and are typically placed on the user’s Desktop or Start Menu. Because the malware exploits a zero-day vulnerability in the way that Windows processes shortcut files, the malware is able to execute without using the AutoRun feature. The malware appears to launch when a USB storage device is viewed using a file manager such as Windows Explorer. These products are widely used in many critical infrastructure sectors. SIMATIC® STEP 7 is engineering software used in the programming and configuration of SIMATIC® programmable controllers. SIMATIC® WinCC HMI is a scalable process-visualization system for monitoring automated processes. On Jproof-of-concept exploit code for the zero-day Windows vulnerability was publicly released. ICS-CERT is currently evaluating the malware to determine the potential affects that it could have on control system environments. The actual impact to control environments is not yet known. Exact software versions and configurations that may be affected are still being analyzed jointly by ICS-CERT and Siemens CERT. The malware also appears to interact with SIMATIC® WinCC or SIMATIC® Siemens STEP 7 software. There are also unconfirmed reports that Windows 2000 and Windows XP SP2 are also susceptible to this zero-day vulnerability. Windows Server 2008 R2 for Itanium-based Systems.Windows Server 2008 R2 for 圆4-based Systems.Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2.Windows Server 2008 for 圆4-based Systems and Windows Server 2008 for 圆4-based Systems Service Pack 2.Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2.Windows Vista 圆4 Edition Service Pack 1 and Windows Vista 圆4 Edition Service Pack 2.Windows Vista Service Pack 1 and Windows Vista Service Pack 2.Windows Server 2003 with SP2 for Itanium-based Systems.Windows Server 2003 圆4 Edition Service Pack 2.Windows XP Professional 圆4 Edition Service Pack 2.Microsoft reports that the zero-day vulnerability affects the following versions of Windows: ICS-CERT is coordinating with Siemens CERT, CERT/CC, Microsoft, and other groups both domestically Affected Systems The full capabilities of the malware and intent or results of the queries are not yet known. ICS-CERT has confirmed the malware installs a trojan that interacts with installed SIMATIC® WinCC or SIMATIC® Siemens STEP 7 software and then makes queries to any discovered SIMATIC® databases. ![]() detailing the previously unknown vulnerability. Microsoft has also released a Security Advisory (2286198)Microsoft Security Advisory,, website last visited July 19, 2010. detailing the vulnerability and suggested workarounds. US-CERT has released a Vulnerability NoteVulnerability Note,, website last visited July 16, 2010. The malware utilizes this zero-day vulnerability and exploits systems after users open a USB drive with a file manager capable of displaying icons (like Windows Explorer). the discovery of malware that uses a zero-day vulnerability in Microsoft Windows processing of shortcut files. VirusBlokAda, an antivirus vendor based in Belarus, announcedVirusBlokAda,, website last visited July 15, 2010. ![]()
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