{"id":41260,"date":"2015-02-14T07:48:54","date_gmt":"2015-02-14T15:48:54","guid":{"rendered":"https:\/\/blogs.mcafee.com\/?p=41260"},"modified":"2025-06-05T19:00:09","modified_gmt":"2025-06-06T02:00:09","slug":"steamstealer-attacks-victims-via-chat","status":"publish","type":"post","link":"https:\/\/www.mcafee.com\/blogs\/other-blogs\/mcafee-labs\/steamstealer-attacks-victims-via-chat\/","title":{"rendered":"Steamstealer Attacks Victims via Chat"},"content":{"rendered":"<p>During the last few months, McAfee Labs has seen an increase in Steamstealer samples. The following chart shows the recent trend:<br \/>\n<a href=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/chart3.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-41262\" src=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/chart3.png\" alt=\"\" width=\"475\" height=\"216\" srcset=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/chart3.png 475w, https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/chart3-300x136.png 300w\" sizes=\"auto, (max-width: 475px) 100vw, 475px\" \/><\/a><br \/>\nSteamstealer is a Trojan that remotely steals a victim&#8217;s sensitive information. This malware needs Microsoft .Net framework to be installed on the victim\u2019s machine and spreads via spam messages that come through the Steam community&#8211;where users play and download the games, software, etc. Users of this community need to create an account to get access to these services. Whenever a user tries to log in to a steam account, the system sends a one-time password to the registered ID to log in to the account. The following snapshot shows an example:<br \/>\n<a href=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/1.code_.11.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-41215\" src=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/1.code_.11.png\" alt=\"\" width=\"444\" height=\"521\" srcset=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/1.code_.11.png 444w, https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/1.code_.11-256x300.png 256w\" sizes=\"auto, (max-width: 444px) 100vw, 444px\" \/><\/a><\/p>\n<p>The malware is propagated via Steam chat. Once a user logs into the account, the attacker sends unsuspected victims malicious links. Sometimes the attacker uses the Steam marketplace to offer &#8220;deals&#8221; at very low prices to lure victims into installing an innocuous screensaver or games that are actually a threat. The malicious executable may have one of the following names:<\/p>\n<ul>\n<li>steamwebhelper.exe<\/li>\n<li>steamfilestealer.exe<\/li>\n<li>img_012.exe<\/li>\n<li>browse_service.exe<\/li>\n<li>bv847347bdg.exe<\/li>\n<li>SteamStear260115.exe<\/li>\n<li>Attachments_27_01_2014.exe<\/li>\n<\/ul>\n<h2>Steamstealer usually copies itself into the administrator\u2019s application data folder:<\/h2>\n<ul>\n<li>C:\\Documents and Settings\\Administrator\\Application Data\\steamwebhelper2\\steamwebhelper.exe<\/li>\n<\/ul>\n<p>This malware is highly obfuscated with Confuser, an open-source app. Confuser is a popular free product that obfuscates files to make them difficult to reverse engineer. If we load the obfuscated file in IDA, we see the following error:<\/p>\n<p><a href=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/3.error_.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-41132\" src=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/3.error_.png\" alt=\"\" width=\"651\" height=\"160\" srcset=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/3.error_.png 936w, https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/3.error_-300x74.png 300w\" sizes=\"auto, (max-width: 651px) 100vw, 651px\" \/><\/a><\/p>\n<p>Steamstealer uses several icons:<\/p>\n<p><a href=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/2.icon_.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-41142\" src=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/2.icon_.png\" alt=\"2.icon\" width=\"631\" height=\"130\" srcset=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/2.icon_.png 805w, https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/2.icon_-300x62.png 300w\" sizes=\"auto, (max-width: 631px) 100vw, 631px\" \/><\/a><\/p>\n<p>Some of the Steamstealer&#8217;s main functions are shown below:<\/p>\n<p><a href=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/4.IDA_Full.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-41145\" src=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/4.IDA_Full-1024x417.png\" alt=\"\" width=\"638\" height=\"260\" srcset=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/4.IDA_Full-1024x417.png 1024w, https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/4.IDA_Full-300x122.png 300w, https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/4.IDA_Full.png 1666w\" sizes=\"auto, (max-width: 638px) 100vw, 638px\" \/><\/a><\/p>\n<h2><strong>Functions<\/strong><\/h2>\n<ul>\n<li><strong>Steamworker<\/strong> is the name of the class with the object that collects the information of the victim\u2019s machine, including cookies, friends, etc.<\/li>\n<li><strong>addOffer<\/strong> is the function the attacker uses to ask the victim to add in the list, which can be used later:<br \/>\n<blockquote>\n<table>\n<tbody>\n<tr>\n<td>\u00a0addOffer<strong>(\u201c765611981401****2\u201d, \u201d179905**4\u201d, \u201d3dnc**Nb\u201d) <\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/blockquote>\n<\/li>\n<\/ul>\n<p style=\"padding-left: 30px;\">The first parameter, \u201c765611981401****2,\u201d is the profile ID of the user \u201csteamcommunity.com\/765611981401****2.\u201d The second parameter, \u201c179905**4,\u201d is used as the trade offer ID\u00a0 \u201csteamcommunity.com\/179905**4.\u201d The third parameter is the Token ID such as \u201csteamcommunity.com\/179905**4&amp;token=3dnc**Nb.\u201d<\/p>\n<ul>\n<li><strong>ParseSteamCookies<\/strong> allows the attacker to steal the session cookies of the Steam user.<\/li>\n<li><strong>addItemstoSteal<\/strong> defines the items and information to steal from the victim&#8217;s machine.<\/li>\n<li><strong>SendItems<\/strong> sends the stolen information from the victim\u2019s account to the attacker\u2019s account.<\/li>\n<li><strong>sendMessageToFriends<\/strong> sends the message to the stolen ID.<\/li>\n<\/ul>\n<h2><strong>Stealing the data<\/strong><\/h2>\n<p>The malware first compresses the stolen data into the zip format:<\/p>\n<p><a href=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/5.IDA_steal_Data.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-41158\" src=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/5.IDA_steal_Data-1024x270.png\" alt=\"\" width=\"649\" height=\"171\" srcset=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/5.IDA_steal_Data-1024x270.png 1024w, https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/5.IDA_steal_Data-300x79.png 300w, https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/5.IDA_steal_Data.png 1435w\" sizes=\"auto, (max-width: 649px) 100vw, 649px\" \/><\/a><\/p>\n<p>It next grabs the victim\u2019s machine name, username, and IP address, by sending a web request to icanhazip.com (the data can be used for future spamming). The malware sends this data to the attacker\u2019s email ID:<\/p>\n<p><a href=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/7.Snipped_original.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-41162\" src=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/7.Snipped_original.png\" alt=\"\" width=\"625\" height=\"245\" srcset=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/7.Snipped_original.png 661w, https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/7.Snipped_original-300x118.png 300w\" sizes=\"auto, (max-width: 625px) 100vw, 625px\" \/><\/a><\/p>\n<p>The attacker sends links that appear harmless to the victim but actually downloads the malware. The attacker sends a Google document that looks legitimate but contains an executable.<\/p>\n<p><a href=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/doc__name.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-41337\" src=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/doc__name.png\" alt=\"\" width=\"452\" height=\"856\" srcset=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/doc__name.png 452w, https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/doc__name-158x300.png 158w\" sizes=\"auto, (max-width: 452px) 100vw, 452px\" \/><\/a><\/p>\n<p>The attacker also collects information about user login data from various browser files:<\/p>\n<ul>\n<li>OldOperaPath=&#8221;%Appdata%\\\\Opera\\\\Opera\\\\wand.dat&#8221;<\/li>\n<li>OldOperaPathX64=&#8221;%Appdata%\\\\Opera\\\\Opera x64\\\\wand.dat&#8221;;<\/li>\n<li>ChromePath=&#8221;%LocalAppdata%\\\\Google\\\\Chrome\\\\User Data\\\\Default\\\\Login Data&#8221;<\/li>\n<li>YandexPath=&#8221;%LocalAppData%\\\\Yandex\\\\Yandex Browser\\\\User Data\\\\Defaul\\\\LoginData&#8221;<\/li>\n<\/ul>\n<p>A snapshot of the attacker\u2019s credentials:<\/p>\n<p><a href=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/credentials1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-41327\" src=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/credentials1.jpg\" alt=\"\" width=\"314\" height=\"344\" srcset=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/credentials1.jpg 314w, https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/credentials1-274x300.jpg 274w\" sizes=\"auto, (max-width: 314px) 100vw, 314px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>Stolen data from the victim\u2019s machine:<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/stolen2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-41329\" src=\"https:\/\/securingtomorrow.mcafee.com\/wp-content\/uploads\/stolen2.png\" alt=\"\" width=\"606\" height=\"539\" srcset=\"https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/stolen2.png 886w, https:\/\/www.mcafee.com\/blogs\/wp-content\/uploads\/stolen2-300x266.png 300w\" sizes=\"auto, (max-width: 606px) 100vw, 606px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>McAfee products detect this threat as PWS-FCAA! and PWS-FBYZ!<\/p>\n<p>I would like to thank my colleague Rakesh Sharma for his help with this analysis.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>During the last few months, McAfee Labs has seen an increase in Steamstealer samples. The following chart shows the recent&#8230;<\/p>\n","protected":false},"author":674,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[442],"tags":[1814,142,180],"coauthors":[3973],"class_list":["post-41260","post","type-post","status-publish","format-standard","hentry","category-mcafee-labs","tag-computer-security","tag-tag-identity-theft","tag-malware"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Steamstealer Attacks Victims via Chat | McAfee Blog<\/title>\n<meta name=\"description\" content=\"During the last few months, McAfee Labs has seen an increase in Steamstealer samples. 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