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Worm:Win32/Taterf.DM

First posted on 02 October 2019.
Source: Microsoft

Aliases :

Worm:Win32/Taterf.DM is also known as Win32/Autorun.worm.112128.M, W32/Taterf.B!Generic, Trojan-GameThief.Win32.Magania.depz, Trojan.PWS.Magania.AGFQ, Trojan horse PSW.OnlineGames3.AJYJ, TR/PSW.Magania.depz, Trojan.Onlinegames.1140, Trojan.PWS.Wsgame.13295, Win32/PSW.OnLineGames.OUM, PWS-Mmorpg!oz, PWS:Win32/Frethog.gen!H, W32/Lineage.LIC, Trojan.Win32.Generic.5202AFD2, W32/Autorun-BCM, Trojan-GameThief.Win32.Magania.

Explanation :

Win32/Taterf.DM is a worm that spread via mapped drives in order to steal login and account details for popular online games.When executed, Win32/Taterf.DM copies itself to the system directory as a hidden file using one of the following file names:  The registry is modified to run the copy at each Windows start (for example): Adds value: ""With data: "."To subkey: amvaamvoexeHKCUSoftwareMicrosoftWindowsCurrentVersionRun

Adds value: ""With data: "."To subkey: avpaavpoexeHKCUSoftwareMicrosoftWindowsCurrentVersionRun

 Note: Filenames and registry modifications differ according to variant. The functionality to perform Win32/Taterf.DM's password-stealing payload is contained in a dll component which is also dropped to the system directory using one of the following file names: Where may be omitted entirely, or be a numeral from 0-9. Once dropped, the dll is injected into "" or "". These dlls may be detected as Worm:Win32/Taterf.DM..dll, according to variant.explorer.exeiexplore.exe It should be noted that, in order to evade detection, the authors of Win32/Taterf.DM may pack the worm's executable. In cases such as these, the worm may be detected with the following names: A driver with a randomly generated file name may also be dropped in the %temp% directory depending on which packer is used. This driver is detected as either VirTool:WinNT/Vanti.gen!A or VirTool:WinNT/Vanti.B. The above mentioned DLLs may also be written to the %temp% directory when these packers are used. The Vanti detections may also drop a driver which clears the SSDT (System Service Descriptor Table, a rootkit component), in order to avoid detection.    Mapped removable and network drivesThe worm continually enumerates drives from C- Z, copying itself to the root of the drive, and creating an 'autorun.inf' file, which points to one of the copies that it creates. When the removable or networked drive is accessed from another computer supporting the Autorun feature, the malware is launched automatically. This 'autorun.inf' file is detected as Worm:Win32/Taterf!inf. The name that the worm uses to copy itself to in the root of the drive differs across variants, however, it usually consists of random letters and numbers with a '.com', 'cmd' or an '.exe' extension. For example: q.com d.comd6fagcs8.cmdgjn2pjlw.exeh1dwg20.exeh6o0re.cmd

Steals online game data
Once injected, the DLL is used to obtain account information for one or more of the following Massively Multiplayer Online Games and affiliated products: As part of this process, Worm:Win32/Taterf.DM may monitor the following processes related to online games: amo.exe cabalmain.exe cc.exe client.exe dakerden.exe dakeron.exe dnf.exe ffclient.exe ge.exe gersang.exe goonzu.exe hevaonline.exe inphasenxd.exe knightonline.exe main.exe maplestory.exe mir3game.exe mixer.exe nida.exe so3d.exe winbaram.exe wow.exe  The captured details are sent to a remote server.  Modifies system settings Win32/Taterf.DM modifies the following registry modifications, which specify how hidden folders and files are displayed using Windows Explorer:HKCUSoftwareMicrosoftWindowsCurrentVersionPoliciesExplorerNoDriveTypeAutoRunHKCUSoftwareMicrosoftWindowsCurrentVersionExplorerAdvancedShowSuperHiddenHKCUSoftwareMicrosoftWindowsCurrentVersionExplorerAdvancedHiddenHKLMSoftwareMicrosoftWindowsCurrentVersionexplorerAdvancedFolderHiddenSHOWALLCheckedValue
  Downloads arbitrary filesThe worm contacts the a specific domain in order to download files and update itself. In the wild, we have observed the malware contacting the following Web sites to download arbitrary files:  Modifies system security settings 
The worm attempts to circumvent security products by:  Analysis by Matt McCormack Installation Spreads Via... Payload amvo.exe kavo.exe awda.exe avpo.exe cyban.exe xvassdf.exe uret463.exe herss.exe olhrwef.exe nodqq.exe ahnsbsb.exe i8ikdjwt.exe 1thes92p.exe kva8wr.exe aqoeerw.exe ckvo.exe kxvo.exe amvo.dll avpo.dll kavo.dll cyban dll. dqq.dll cvasds.dll softqq.dll .dll VirTool:WinNT/Vanti.gen!A VirTool:Win32/Vanti.B VirTool:Win32/Obfuscator.T Rainbow Island Cabal Online A Chinese Odyssey Hao Fang Battle Net Lineage Gamania MapleStory qqgame Legend of Mir World Of Warcraft 
  om7890.com googlew65.com yahooui0.com Attempting to prevent AVP Antivirus from displaying notifications regarding system changes by closing windows used by this product. Attempting to terminate Ravmon.exe if it is found to be running on the affected system.

Last update 02 October 2019

 

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