Virus:TR/Renos.AT
Date discovered:01/09/2010
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low
Static file:Yes
File size:311.808 Bytes
MD5 checksum:d86103fb5da2e507baab755cf1e2d4a4
IVDF version:7.10.11.68 - Wednesday, September 1, 2010

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Mcafee: Downloader-CEW.b
   •  Kaspersky: Trojan.Win32.FraudPack.biad
   •  F-Secure: W32/Malware!Gemini
   •  Sophos: Mal/FakeAV-CX
   •  PCTools: Trojan.FakeAV
   •  Eset: Win32/TrojanDownloader.FakeAlert.AVU
   •  Sunbelt: VirTool.Win32.Obfuscator.hg!b
   •  AhnLab: Win-Trojan/Fakeav.311808.S
   •  DrWeb: Trojan.MulDrop1.15267


Platforms / OS:
   • Windows 98
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003
   • Windows Vista
   • Windows Server 2008
   • Windows 7


Side effects:
   • Drops a malicious file
   • Registry modification

 Files The following file is created:

– %SYSDIR%\sshnas21.dll Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: TR/Renos.AB.4

 Registry The following registry keys are added:

– [HKCU\Software\Microsoft\Handle]
   • "%random character string%"=dword:%hex values%

– [HKLM\SYSTEM\CurrentControlSet\Services\SSHNAS]
   • "Type"=dword:%hex values%
   • "Start"=dword:%hex values%
   • "ErrorControl"=dword:%hex values%
   • "ImagePath"=hex(2):%hex values%
   • "DisplayName"="SSHNAS"
   • "ObjectName"="LocalSystem

– [HKLM\SYSTEM\CurrentControlSet\Services\SSHNAS\Parameters]
   • "ServiceDll"=hex(2):%hex values%

– [HKLM\SYSTEM\CurrentControlSet\Services\SSHNAS\Security]
   • "Security"=hex:%hex values%



The following registry key is changed:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost]
   New value:
   • "netsvcs"=hex(7):%hex values%

Description inserted by Christoph Baumann on Thursday, September 2, 2010
Description updated by Christoph Baumann on Friday, September 3, 2010

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