ThreatExpert Report: Backdoor.Win32.Afcore.m, Backdoor.Coreflood, CoreFlood, Troj/Afcore-M..

Submission Summary:

Submission details:

Submission received: 15 September 2009, 23:39:54
Processing time: 7 min 22 sec
Submitted sample:

File MD5: 0xD170AD88F40E7C878B40770E5B7700EB
File SHA-1: 0x1E3214BB66D69D84516D7F8ECC786C7FAEDCA82F
Filesize: 143,360 bytes
Alias:

Summary of the findings:

What's been found	Severity Level
Creates a startup registry entry.
Contains characteristics of an identified security risk.

Technical Details:

Possible Security Risk

Attention! The following threat category was identified:

Threat Category	Description
	A malicious backdoor trojan that runs in the background and allows remote access to the compromised system

File System Modifications

The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%Temp%\zggjmyd	0 bytes	MD5: 0xD41D8CD98F00B204E9800998ECF8427E SHA-1: 0xDA39A3EE5E6B4B0D3255BFEF95601890AFD80709	(not available)
2	[file and pathname of the sample #1] %System%\zggjmyd.exe	143,360 bytes	MD5: 0xD170AD88F40E7C878B40770E5B7700EB SHA-1: 0x1E3214BB66D69D84516D7F8ECC786C7FAEDCA82F	Backdoor.Coreflood [Symantec] Backdoor.Win32.Afcore.m [Kaspersky Lab] CoreFlood [McAfee] Troj/Afcore-M [Sophos] Backdoor:Win32/Afcore.K [Microsoft] Backdoor.Win32.Afcore.I [Ikarus] Win-Trojan/Afcore.144329 [AhnLab]

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).
%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 Alternate Data Stream was created in the system:

#	ADS name(s)	ADS Size	ADS Hash	Alias
1	%LocalSettings%\Temp:zggjmyd.dll %Windir%\system32:zggjmyd.dll	126,976 bytes	MD5: 0xA954503A3F06104CF55442EC03955821 SHA-1: 0xDC894CA986C3ED0A0E876CED085F59CB4264C231	Backdoor.Coreflood [Symantec] Backdoor.Win32.Afcore.o [Kaspersky Lab] CoreFlood.dll [McAfee] Troj/Afcore-I [Sophos] Backdoor:Win32/Afcore.BN [Microsoft] Backdoor.Win32.Afcore.I [Ikarus] Win-Trojan/Afcore.122880.B [AhnLab]

Notes:

%LocalSettings% is a variable that specifies the current user's local settings folder. By default, this is C:\Documents and Settings\[UserName]\Local Settings (Windows NT/2000/XP).
%Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.

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]	143,360 bytes
[generic host process]	[generic host process filename]	45,056 bytes
zggjmyd.exe	%System%\zggjmyd.exe	143,360 bytes

Notes:

[generic host process filename] is a full path filename of [generic host process].

The following modules were loaded into the address space of other process(es):

Module Name	Module Filename	Address Space Details
Temp:zggjmyd.dll	%UserProfile%\LOCALS~1\Temp:zggjmyd.dll	Process name: msmsgs.exe Process filename: %ProgramFiles%\messenger\msmsgs.exe Address space: 0x62000000 - 0x6201F000
Temp:zggjmyd.dll	%UserProfile%\LOCALS~1\Temp:zggjmyd.dll	Process name: sdnsmain.exe Process filename: %Windir%\dns\sdnsmain.exe Address space: 0x62000000 - 0x6201F000
Temp:zggjmyd.dll	%UserProfile%\LOCALS~1\Temp:zggjmyd.dll	Process name: IEXPLORE.EXE Process filename: %ProgramFiles%\internet explorer\iexplore.exe Address space: 0x62000000 - 0x6201F000
Temp:zggjmyd.dll	%UserProfile%\LOCALS~1\Temp:zggjmyd.dll	Process name: [filename of the sample #1] Process filename: [file and pathname of the sample #1] Address space: 0x62000000 - 0x6201F000
Temp:zggjmyd.dll	%UserProfile%\LOCALS~1\Temp:zggjmyd.dll	Process name: VMwareUser.exe Process filename: %ProgramFiles%\vmware\vmware tools\vmwareuser.exe Address space: 0x62000000 - 0x6201F000

Notes:

%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).
%ProgramFiles% is a variable that refers to the Program Files folder. A typical path is C:\Program Files.

Registry Modifications

The newly created Registry Values are:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]

zggjmyd = ""%System%\zggjmyd.exe" Init 1"

so that zggjmyd runs every time Windows starts

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce]

*zggjmyd = ""%System%\zggjmyd.exe" Init 1"

so that zggjmyd runs every time Windows starts

Other details

The following Host Name was requested from a host database:

66.221.215.1

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:

%UserProfile%\LOCALS~1\Temp:zggjmyd.dll

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