ThreatExpert Report: Trojan-Downloader.Win32.Exchanger.jt, TROJ

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Submission Summary:

Submission details:

Submission received: 22 October 2009, 04:25:36
Processing time: 4 min 55 sec
Submitted sample:

File MD5: 0xDABB5A9B431C88C77281BCF1158A9879
File SHA-1: 0x8C439C08189DFE82C50FAFD2F15F11DC937DFE19
Filesize: 78,848 bytes
Alias:

Trojan-Downloader.Win32.Exchanger.jt [Kaspersky Lab]
TROJ_TIBS.QQ [Trend Micro]
Mal/EncPk-DA, Mal/TibsPak [Sophos]
Trojan-Downloader.Win32.Exchanger [Ikarus]
Win32/Zhelatin.worm.78848.E [AhnLab]

Summary of the findings:

What's been found	Severity Level
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.Exchanger	Trojan-Downloader.Exchanger attempts to download malicious files to the local computer and execute them.
Trojan-Downloader.Agent.EL	Trojan-Downloader.Agent.EL downloads and installs other malware onto infected machine.

Attention! The following threat category was identified:

Threat Category	Description
	A program that downloads files to the local computer that may represent security risk

File System Modifications

The following file was created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%System%\CbEvtSvc.exe [file and pathname of the sample #1]	78,848 bytes	MD5: 0xDABB5A9B431C88C77281BCF1158A9879 SHA-1: 0x8C439C08189DFE82C50FAFD2F15F11DC937DFE19	Trojan-Downloader.Win32.Exchanger.jt [Kaspersky Lab] TROJ_TIBS.QQ [Trend Micro] Mal/EncPk-DA, Mal/TibsPak [Sophos] Trojan-Downloader.Win32.Exchanger [Ikarus] Win32/Zhelatin.worm.78848.E [AhnLab]

Note:

%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 was a new process created in the system:

Process Name	Process Filename	Main Module Size
CbEvtSvc.exe	%System%\cbevtsvc.exe	102,400 bytes

There was a new service created in the system:

Service Name	Display Name	Status	Service Filename
CbEvtSvc	CbEvtSvc	"Running"	%System%\CbEvtSvc.exe -k netsvcs

Registry Modifications

The following Registry Keys were created:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_CBEVTSVC
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_CBEVTSVC\0000
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_CBEVTSVC\0000\Control
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\CbEvtSvc
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\CbEvtSvc\Security
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\CbEvtSvc\Enum
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_CBEVTSVC
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_CBEVTSVC\0000
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_CBEVTSVC\0000\Control
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CbEvtSvc
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CbEvtSvc\Security
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CbEvtSvc\Enum

The newly created Registry Values are:

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_CBEVTSVC\0000\Control]

*NewlyCreated* = 0x00000000
ActiveService = "CbEvtSvc"

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_CBEVTSVC\0000]

Service = "CbEvtSvc"
Legacy = 0x00000001
ConfigFlags = 0x00000000
Class = "LegacyDriver"
ClassGUID = "{8ECC055D-047F-11D1-A537-0000F8753ED1}"
DeviceDesc = "CbEvtSvc"

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum\Root\LEGACY_CBEVTSVC]

NextInstance = 0x00000001

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\CbEvtSvc\Enum]

0 = "Root\LEGACY_CBEVTSVC\0000"
Count = 0x00000001
NextInstance = 0x00000001

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\CbEvtSvc\Security]

Security = 01 00 14 80 90 00 00 00 9C 00 00 00 14 00 00 00 30 00 00 00 02 00 1C 00 01 00 00 00 02 80 14 00 FF 01 0F 00 01 01 00 00 00 00 00 01 00 00 00 00 02 00 60 00 04 00 00 00 00 00 14 00 FD 01 02 00 01 01 00 00 00 00 00 05 12 00 00 00 00 00 18 00 FF 01 0F 0

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\CbEvtSvc]

Type = 0x00000010
Start = 0x00000002
ErrorControl = 0x00000001
ImagePath = "%System%\CbEvtSvc.exe -k netsvcs"
DisplayName = "CbEvtSvc"
ObjectName = "LocalSystem"
Opt = (zero-length binary value)

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_CBEVTSVC\0000\Control]

*NewlyCreated* = 0x00000000
ActiveService = "CbEvtSvc"

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_CBEVTSVC\0000]

Service = "CbEvtSvc"
Legacy = 0x00000001
ConfigFlags = 0x00000000
Class = "LegacyDriver"
ClassGUID = "{8ECC055D-047F-11D1-A537-0000F8753ED1}"
DeviceDesc = "CbEvtSvc"

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_CBEVTSVC]

NextInstance = 0x00000001

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CbEvtSvc\Enum]

0 = "Root\LEGACY_CBEVTSVC\0000"
Count = 0x00000001
NextInstance = 0x00000001

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CbEvtSvc\Security]

Security = 01 00 14 80 90 00 00 00 9C 00 00 00 14 00 00 00 30 00 00 00 02 00 1C 00 01 00 00 00 02 80 14 00 FF 01 0F 00 01 01 00 00 00 00 00 01 00 00 00 00 02 00 60 00 04 00 00 00 00 00 14 00 FD 01 02 00 01 01 00 00 00 00 00 05 12 00 00 00 00 00 18 00 FF 01 0F 0

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CbEvtSvc]

Type = 0x00000010
Start = 0x00000002
ErrorControl = 0x00000001
ImagePath = "%System%\CbEvtSvc.exe -k netsvcs"
DisplayName = "CbEvtSvc"
ObjectName = "LocalSystem"
Opt = (zero-length binary value)

The following Registry Values were modified:

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\ServiceCurrent]

(Default) =

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\ServiceCurrent]

(Default) =

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