{"id":7630,"date":"2017-08-31T18:48:41","date_gmt":"2017-08-31T18:48:41","guid":{"rendered":"http:\/\/blog.nsfocusglobal.com\/?p=787"},"modified":"2017-08-31T18:48:41","modified_gmt":"2017-08-31T18:48:41","slug":"moyou-trojan-analysis","status":"publish","type":"post","link":"https:\/\/nsfocusglobal.com\/pt-br\/moyou-trojan-analysis\/","title":{"rendered":"Moyou Trojan Analysis"},"content":{"rendered":"

Overview<\/strong><\/h2>\n

On August 2, 2017, ANTIY discovered a new DDoS trojan and dubbed it Moyou. After obtaining the related sample, NSFOCUS conducted a detailed analysis of the trojan.<\/p>\n

Sample Analysis<\/strong><\/h2>\n

The following figure shows the detection result of NSFOCUS Threat Analysis Center (TAC).<\/p>\n

\"\"<\/a><\/p>\n

The sample obtains the C&C server address (www.linux288.com<\/a>) by reading data from the resource section.<\/p>\n

\"\"<\/a><\/p>\n

The sample obtains host information, including the CPU information, memory information, host name, and operating system information, and sends such information to the C&C server as a registration package for online operations. Subsequently the trojan can receive attack instructions from the C&C server. By the time this analysis was performed, the abovementioned C&C server address had been invalid and could not be connected to.<\/p>\n

\"\"<\/a><\/p>\n

According to ANTIY’s report, the packet captured when the server was active reveals that the instruction was crafted in a specific format and sent in plaintext, as shown in the following figure.<\/p>\n

\"\"<\/a><\/p>\n

After receiving the instruction list, the sample parses the instruction as per the specified format.<\/p>\n

\"\"<\/a><\/p>\n

The preliminary analysis finds that the client sends the first five bytes, used to indicate its own status, to the C&C server. When finding that the format of data received is incorrect, the server sends 04 00 00 00 00 to the client as a response.<\/p>\n

\"\"<\/a><\/p>\n

Detection Method<\/strong><\/h2>\n

\u00a0 \u00a0Local and Network Detection<\/h3>\n
    \n
  • Check suspicious startup items.<\/li>\n
  • Check connectivity to the C&C server (www.linux288.com).<\/li>\n<\/ul>\n

    Network device filtering rule (if the C&C server is active, the check can be performed against the registration package):<\/p>\n

      \n
    • With the offset of 0, the first five bytes are 02 be 00 00 00.<\/li>\n
    • Check whether this string is contained: linux2883:veri20170630ee.<\/li>\n<\/ul>\n

      \u00a0 \u00a0NSFOCUS Detection Services<\/h3>\n
        \n
      • NSFOCUS engineers provide onsite detection services.<\/li>\n
      • NSFOCUS online cloud detection: You can log in to NSFOCUS Cloud to apply for a trial use of the scanning service.<\/li>\n<\/ul>\n

        \u00a0 \u00a0NSFOCUS Solutions for Removing Trojans<\/h3>\n
          \n
        • Short-term service: NSFOCUS engineers provide the onsite trojan backdoor removal service (manual services + NIPS + TAC). to ensure that risk points are immediately eliminated from the network and the event impact is minimized. After the handling, an event analysis report is provided.<\/li>\n
        • Mid-term service: NSFOCUS provides 3- to 6-month risk monitoring and preventive maintenance inspection (PMI) services (NIPS + TAC + manual services) to eradicate risks and prevent events from recurring.<\/li>\n
        • Long-term service: NSFOCUS provides risk solutions for the fund industry (threat intelligence, attack source traceback, and professional security services).<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

          Overview On August 2, 2017, ANTIY discovered a new DDoS trojan and dubbed it Moyou. After obtaining the related sample, NSFOCUS conducted a detailed analysis of the trojan. Sample Analysis The following figure shows the detection result of NSFOCUS Threat Analysis Center (TAC). The sample obtains the C&C server address (www.linux288.com) by reading data from […]<\/p>\n","protected":false},"author":1,"featured_media":7789,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","footnotes":""},"categories":[6],"tags":[],"class_list":["post-7630","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-emergency-response"],"acf":[],"yoast_head":"\nMoyou Trojan Analysis - NSFOCUS<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Moyou Trojan Analysis - NSFOCUS\" \/>\n<meta property=\"og:description\" content=\"Overview On August 2, 2017, ANTIY discovered a new DDoS trojan and dubbed it Moyou. 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