ThreatExpert Report: Trojan-Downloader.Win32.AutoIt.aa, W32/YahLover.worm.gen, W32/Sohana-R..

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Submission Summary:

Submission details:

Submission received: 19 October 2011, 14:40:39
Processing time: 10 min 6 sec
Submitted sample:

File MD5: 0x7EC670958F1C8FFD75055E3B8A04D9ED
File SHA-1: 0x345A403C537A8EF45C35884BBEA1677D8BFEDEE3
Filesize: 240,128 bytes
Alias:

Trojan-Downloader.Win32.AutoIt.aa [Kaspersky Lab]
W32/YahLover.worm.gen [McAfee]
W32/Sohana-R [Sophos]
Worm:Win32/Sohonad.S [Microsoft]
Trojan-Downloader.Win32.AutoIt [Ikarus]
Win32/Sohanad.worm.239905 [AhnLab]

Summary of the findings:

What's been found	Severity Level
Downloads/requests other files from Internet.
Modifies some system settings that may have negative impact on overall system security state.
Creates a startup registry entry.
Contains characteristics of an identified security risk.

Technical Details:

Possible Security Risk

Attention! Characteristics of the following security risks were identified in the system:

Security Risk	Description
Trojan-Downloader.AutoIt!ct	Trojan-Downloader.AutoIt!ct attempts to download malicious files to the local computer and execute them
Trojan-Downloader.Autoit	Trojan-Downloader.Autoit is A program that downloads files to the local computer that may represent security risk.
Worm.IM.Sohanad	Worm.IM.Sohanad spreads via Yahoo Messenger and infects Windows. It sends a message to all Yahoo Messenger contacts of an infected user. The message contains a link enticing users to download the worm. The worm also disable certain Windows functionalities abd hijacks Internet Explorer homepage. It also downloads other maware and it will also attempt to propagate via the means of creating copies of itself onto removable devices such as USB flash and hard drives.

Attention! The following threat categories were identified:

Threat Category	Description
	A program that downloads files to the local computer that may represent security risk
	A malicious trojan horse or bot that may represent security risk for the compromised system and/or its network environment

File System Modifications

The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%Windir%\SSVICHOSST.exe [file and pathname of the sample #1] %System%\SSVICHOSST.exe	240,128 bytes	MD5: 0x7EC670958F1C8FFD75055E3B8A04D9ED SHA-1: 0x345A403C537A8EF45C35884BBEA1677D8BFEDEE3	Trojan-Downloader.Win32.AutoIt.aa [Kaspersky Lab] W32/YahLover.worm.gen [McAfee] W32/Sohana-R [Sophos] Worm:Win32/Sohonad.S [Microsoft] Trojan-Downloader.Win32.AutoIt [Ikarus] Win32/Sohanad.worm.239905 [AhnLab]
2	%System%\autorun.ini	109 bytes	MD5: 0x43B9DFD6E61EBA0DDA808AB0F5F966AA SHA-1: 0xFFDCA1842198D91DAE7C98E862704EA80235894B	Trojan.Win32.AutoRun.a [Kaspersky Lab] W32/Hakaglan.inf [McAfee] W32/AutoIt-IL [Sophos] Trojan.Win32.AutoRun [Ikarus]
3	%System%\setting.ini	125 bytes	MD5: 0x7C5F5A68051F6B0C0E9A2AD33C40D415 SHA-1: 0x120865765927A61AF83F02B83DC297EEDE61EC41	(not available)
4	%Windir%\Tasks\At1.job	354 bytes	MD5: 0x85298338A19CAE5CE13EC1C02E512518 SHA-1: 0xCB36175B39B2F60BA8FC89E8FA6DECA56B6FA58E	(not available)

Notes:

%Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.
%System% is a variable that refers to the System folder. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

Memory Modifications

There were new processes created in the system:

Process Name	Process Filename	Main Module Size
[filename of the sample #1]	[file and pathname of the sample #1]	618,496 bytes
SSVICHOSST.exe	%System%\ssvichosst.exe	618,496 bytes
SSVICHOSST.exe	%Windir%\ssvichosst.exe	618,496 bytes

Registry Modifications

The following Registry Key was created:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System

The newly created Registry Values are:

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]

NofolderOptions = 0x00000001

to remove the Folder Options item from all Windows Explorer menus and from Control Panel

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System]

DisableTaskMgr = 0x00000001
DisableRegistryTools = 0x00000001

to prevent users from starting Task Manager (Taskmgr.exe)

to disable the Windows registry editors (Regedt32.exe and Regedit.exe)

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run]

Yahoo Messengger = "%System%\SSVICHOSST.exe"

so that SSVICHOSST.exe runs every time Windows starts

The following Registry Value was modified:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]

Shell =

Other details

Analysis of the file resources indicate the following possible country of origin:

United Kingdom

The following HTTP URLs were started reading:

http://nhatquanglan3.t35.com/setting.nql
http://nhatquanglan4.t35.com/setting.nql
http://nhatquanglan4.t35.com/setting.xls
http://nhatquanglan3.t35.com/setting.xls

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