ThreatExpert Report: TrojanDownloader:Win32/Cutwail.AG

Submission Summary:

Submission details:

Submission received: 10 January 2009, 21:52:50
Processing time: 5 min 58 sec
Submitted sample:

File MD5: 0xF5B631DDD297CDFC7BABFE3380B58F27
File SHA-1: 0xBE9B8E55F3A20A14DE46349CE14EA0CE13EE4E91
Filesize: 72,704 bytes
Alias: TrojanDownloader:Win32/Cutwail.AG [Microsoft]

Summary of the findings:

What's been found	Severity Level
Creates a startup registry entry.

Technical Details:

File System Modifications

The following file was created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%UserProfile%\reader_s.exe %System%\reader_s.exe [file and pathname of the sample #1]	72,704 bytes	MD5: 0xF5B631DDD297CDFC7BABFE3380B58F27 SHA-1: 0xBE9B8E55F3A20A14DE46349CE14EA0CE13EE4E91	TrojanDownloader:Win32/Cutwail.AG [Microsoft]

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).
%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
reader_s.exe	%System%\reader_s.exe	N/A
reader_s.exe	%UserProfile%\reader_s.exe	N/A

There was a new memory page created in the address space of the system process(es):

Process Name	Process Filename	Allocated Size
svchost.exe	%System%\svchost.exe	4,096 bytes

Registry Modifications

The newly created Registry Values are:

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

reader_s = "%System%\reader_s.exe"

so that reader_s.exe runs every time Windows starts

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

reader_s = "%UserProfile%\reader_s.exe"

so that reader_s.exe runs every time Windows starts

Other details

The following Host Name was requested from a host database:

panda-server.ru

There were registered attempts to establish connection with the remote hosts. The connection details are:

Remote Host	Port Number
114.80.67.31	80
218.61.7.9	80
70.38.64.149	80
216.195.58.111	80
216.195.56.251	80
58.253.66.46	80

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