ThreatExpert Report: Trojan-Downloader.Agent!sd6, Trojan-Downloader.Win32.Small.agns..

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Submission Summary:

Submission details:

Submission received: 19 February 2009, 16:14:40
Processing time: 6 min 21 sec
Submitted sample:

File MD5: 0x7225361C6BAC963C971F1E8BA6441732
File SHA-1: 0x4FF267037E71C6BDC873415AD5E957CDDA5D8803
Filesize: 249,207 bytes
Alias:

Trojan-Downloader.Agent!sd6 [PCTools]
Downloader [Symantec]
Trojan-Downloader.Win32.Small.agns, Trojan-PSW.Win32.LdPinch.abwr, Trojan-Downloader.Win32.Agent.asfy, Trojan.Win32.Agent.arvs [Kaspersky Lab]
Generic Downloader.x [McAfee]
Trojan-Downloader.JLIQ [Ikarus]

Summary of the findings:

What's been found	Severity Level
Threat characteristics of Vundo (aka VirtuMonde/VirtuMundo), a trojan horse that cause popups and advertises rogue antispyware programs. Vundo can be installed by visiting a Web site link contained in a spammed email. It is known to create a DLL file in the Windows system32 directory and inject it into system processes winlogon.exe and explorer.exe.
Downloads/requests other files from Internet.
Registers a Winlogon notification package so that the installed module is loaded into the address space of winlogon.exe.
Registers a 32-bit in-process server DLL.
Contains characteristics of an identified security risk.

Technical Details:

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Possible Security Risk

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

Security Risk	Description
Trojan.Virtumonde	Virtumonde modifies the Windows Internet connection mechanism and display various pop-up advertisements.
Trojan-Downloader.Small.CML	Trojan.Downloader.Small.CML will attempt to connect to a pre-determined website and download additional malware. It will also download a list of commands to execute.
Spyware.Known_Bad_Sites	Indicates that a known bad site may have hijacked. Adware, Spyware and Phishing sites may use the Windows hosts file to redirect your browser to a malicious site when you try to access a valid site such as your Bank.
Trojan.Agent	Trojan.Agent will spy on the browsing habits of users, modify Internet Explorer settings and download malicious files.
Trojan-Downloader.Agent!sd6	Trojan-Downloader.Agent!sd6 attempts to download malicious files to the local computer and execute them.

Attention! The following threat categories were identified:

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

File System Modifications

The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%Temp%\ssqppPJb.bat	79 bytes	MD5: 0x0073A8986B5B8187ED0FA7AD1695929B SHA-1: 0xA031D061FEED4435A8EA7E9200B6DF258E211440	(not available)
2	%Temp%\stf4.tmp %Temp%\win9.tmp %Temp%\winA.tmp	0 bytes	MD5: 0xD41D8CD98F00B204E9800998ECF8427E SHA-1: 0xDA39A3EE5E6B4B0D3255BFEF95601890AFD80709	(not available)
3	%Temp%\WER17d3.dir00\appcompat.txt	16,296 bytes	MD5: 0xF560A82E9385739415E085B4553CBA8F SHA-1: 0x958B55E9517896C07D689F6BDDED4EF10D0718A9	(not available)
4	%Temp%\WER17d3.dir00\explorer.exe.hdmp	0 bytes	MD5: 0xD41D8CD98F00B204E9800998ECF8427E SHA-1: 0xDA39A3EE5E6B4B0D3255BFEF95601890AFD80709	(not available)
5	%Temp%\WER17d3.dir00\explorer.exe.mdmp	64,693 bytes	MD5: 0xE9A10E1631E9FAD140E57AECF79430DA SHA-1: 0xB2EE6194DD266B715D2426E48874CAD439B93436	(not available)
6	%Temp%\WER17d3.dir00\manifest.txt	1,980 bytes	MD5: 0xF380A8E1175928FC9FDE91577393BF44 SHA-1: 0xDB8E7552AAB42FF52BB8C93FD5A0125DFD5D4766	(not available)
7	%UserProfile%\readme.bat	46 bytes	MD5: 0x88A4993CB96AE9469EA97F01E08BE12D SHA-1: 0x4915A2EAD6674A9252628CF99D0FD4184F2E54AE	(not available)
8	%System%\mlJDvtRH.dll	40,448 bytes	MD5: 0xF169263CC3A329DC6CC1FCEAD555E4E6 SHA-1: 0xCE5CF7FBBD73AA67E10888572E04448B2D95E7DF	Trojan.Agent [PCTools] Trojan.Awax [Symantec] Trojan.Win32.Agent.arsp [Kaspersky Lab] Vundo [McAfee] Troj/Agent-IIR [Sophos] Trojan:Win32/Vundo.gen!AG [Microsoft] Trojan.Vundo [Ikarus]
9	[file and pathname of the sample #1]	249,207 bytes	MD5: 0x7225361C6BAC963C971F1E8BA6441732 SHA-1: 0x4FF267037E71C6BDC873415AD5E957CDDA5D8803	Trojan-Downloader.Agent!sd6 [PCTools] Downloader [Symantec] Trojan.Win32.Agent.arvs [Kaspersky Lab] Generic Downloader.x [McAfee] Trojan-Downloader.JLIQ [Ikarus]
10	%System%\winuqw32.dll	39,424 bytes	MD5: 0xB193BCDEDEA464463187DB5994EDAC9C SHA-1: 0x1966F7E9CA5999DFA7F4DD713867D87E85A72947	Downloader [Symantec] Generic.dx [McAfee] Mal/Generic-A [Sophos] Trojan:Win32/Nebuler.gen!G [Microsoft] Trojan-Downloader [Ikarus]

Notes:

%Temp% is a variable that refers to the temporary folder in the short path form. By default, this is C:\Documents and Settings\[UserName]\Local Settings\Temp\ (Windows NT/2000/XP).
%UserProfile% is a variable that specifies the current user's profile folder. By default, this is C:\Documents and Settings\[UserName] (Windows NT/2000/XP).
%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).

The following directory was created:

%Temp%\WER17d3.dir00

Memory Modifications

There were new processes created in the system:

Process Name	Process Filename	Main Module Size
number.exe	%UserProfile%\number.exe	114,688 bytes
serial.exe	%UserProfile%\serial.exe	184,320 bytes
keygen.exe	%UserProfile%\keygen.exe	65,536 bytes
crack.exe	%UserProfile%\crack.exe	106,496 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	135,168 bytes

The following module was loaded into the address space of other process(es):

Module Name	Module Filename	Address Space Details
mlJDvtRH.dll	%System%\mlJDvtRH.dll	Process name: explorer.exe Process filename: %Windir%\explorer.exe Address space: 0x19C0000 - 0x19D9000

Notes:

%Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.

Registry Modifications

The following Registry Keys were created:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{6D794CB4-C7CD-4c6f-BFDC-9B77AFBDC02C}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{6D794CB4-C7CD-4c6f-BFDC-9B77AFBDC02C}\InprocServer32
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Control Panel\Settings
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\mlJDvtRH
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\winuqw32
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\00cd0861
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSSMGR
HKEY_CURRENT_USER\Software\Microsoft\cavok

The newly created Registry Values are:

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{6D794CB4-C7CD-4c6f-BFDC-9B77AFBDC02C}\InprocServer32]

(Default) = "%System%\mlJDvtRH.dll"
ThreadingModel = "Both"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Control Panel\Settings]

Time = 50 11 F4 66 55 32 C9 01 00 00 00 00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellExecuteHooks]

{6D794CB4-C7CD-4c6f-BFDC-9B77AFBDC02C} = ""

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

Asynchronous = 0x00000001
DllName = "mlJDvtRH.dll"
Impersonate = 0x00000000
Logon = "o"
Logoff = "f"

so that mlJDvtRH.dll is installed as a Winlogon notification package

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\winuqw32]

Asynchronous = 0x00000001
DllName = "winuqw32.dll"
Impersonate = 0x00000000
Startup = "jnZfHmNfkV"
Shutdown = "Cfifbb"

so that winuqw32.dll is installed as a Winlogon notification package

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers]

%Windir%\explorer.exe = "EnableNXShowUI"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\00cd0861]

(Default) = "60CAC8EB86224D6CBD179DF959D658E8&"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSSMGR]

Data = 0x0C39DDB2
LSTV = D8 07 0A 00 01 00 14 00 01 00 2C 00 23 00 AF 02
Brnd = 0x00000BBA
MSLIST = 83 98 99 9E D5 DF DE 82 9C 86 9B 90 96 8C D7 94 9E 88 D2 97 92 67 2E 61 6E 60 2B 76 6F 78 09 3A 0B 3C 0D 3E 0F 78 65 66 63 2E 3A 39 78 7A 7C 68 7A 69 7B 6D 7A 48 44 50 0D 4A 40 52 08 41 44 4D 04 4F 40 4A 01 40 59 42 33 04 35 06 37 08 39

The following Registry Values were modified:

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Session Manager\AppCompatibility]

AppCompatCache = EF BE AD DE 60 00 00 00 00 00 00 00 00 00 00 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF F

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\AppCompatibility]

AppCompatCache = EF BE AD DE 60 00 00 00 00 00 00 00 00 00 00 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF F

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3]

1A10 = 0x00000000
{AEBA21FA-782A-4A90-978D-B72164C80120} = 1A 37 61 59 23 52 35 0C 7A 5F 20 17 2F 1E 1A 19 0E 2B 01 73 13 37 13 12 14 1A 15 2A
{A8A88C49-5EB2-4990-A1A2-0876022C854F} = 1A 37 61 59 23 52 35 0C 7A 5F 20 17 2F 1E 1A 19 0E 2B 01 73 13 37 13 12 14 1A 15 2A

Other details

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

Russian Federation

To mark the presence in the system, the following Mutex objects were created:

DDrawWindowListMutex
DDrawDriverObjectListMutex
__DDrawExclMode__
3002
m3d5rt10

The data identified by the following URLs was then requested from the remote web server:

http://caaaa.wwlax.com/get_frst.php?uid=00CD1A40-0C78-1033-0815-080000000001
http://aaqarkznvb.com/progs/hzfbccd/spmmnaok.php?adv=adv449
http://aaqarkznvb.com/progs/hzfbccd/czvsjkk.php
http://bajfotqwuh.net/progs/hzfbccd/czvsjkk.php
http://aaqarkznvb.com/progs/hzfbccd/wczznnab
http://bajfotqwuh.net/progs/hzfbccd/wczznnab
http://pornfat.net/img/cmd.php?c=I0&v=22&b=3002&id=C39DDB2&cnt=ENU&q=4148E
http://oberaufseher.net/img/cmd.php?c=I0&v=22&b=3002&id=C39DDB2&cnt=ENU&q=4148E
http://85.12.43.75/go/?cmp=riva& affid=166516&uid=&guid=60CAC8EB86224D6CBD179DF959D 658E8&param=ID1%3E1-0:2-0:3-0:0%7CID2%3E1-0:2-0:3- 0:0%7CID3%3E1-0:2-0:3-0:0%7CID4%3E1-0:2-0:3-0:0%7C ID5%3E1-0:2-0:3-0:0%7CID6%3E1-0:2-0:3-0:0%7CID7%3E..

The following Internet download was started (the retrieved bits are saved into the local file):

URL to be downloaded	Filename for the downloaded bits
http://bugreport.waverevenue.com/rp.txt?ver=93&uid=00CD1A40-0C78-1033-0815-080000000001&iam=I&st=DnFl	%Temp%\_5.tmp

There was application-defined hook procedure installed into the hook chain (e.g. to monitor keystrokes). The installed hook is handled by the following module:

%System%\mlJDvtRH.dll

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