ThreatExpert Report: Generic.dx!bf3b, Worm:Win32/Cridex.B, Trojan-Dropper.Win32.Dapato

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Submission Summary:

Submission details:

Submission received: 31 July 2012, 04:18:02
Processing time: 8 min 47 sec
Submitted sample:

File MD5: 0xB512C5AC8AC3C8A114747AC77B1F2B21
File SHA-1: 0xCD572A4B90A6E7597673637B1BA7D609ED71C4DC
Filesize: 70,656 bytes
Alias & packer info:

Generic.dx!bf3b [McAfee]
Worm:Win32/Cridex.B [Microsoft]
Trojan-Dropper.Win32.Dapato [Ikarus]
packed with: UPX [Kaspersky Lab]

Summary of the findings:

What's been found	Severity Level
Produces outbound traffic.
Downloads/requests other files from Internet.
Creates a startup registry entry.

Technical Details:

File System Modifications

The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%AppData%\KB00441600.exe	70,656 bytes	MD5: 0xB512C5AC8AC3C8A114747AC77B1F2B21 SHA-1: 0xCD572A4B90A6E7597673637B1BA7D609ED71C4DC	Generic.dx!bf3b [McAfee] Worm:Win32/Cridex.B [Microsoft] Trojan-Dropper.Win32.Dapato [Ikarus] packed with UPX [Kaspersky Lab]
2	%Temp%\POS2.tmp	0 bytes	MD5: 0xD41D8CD98F00B204E9800998ECF8427E SHA-1: 0xDA39A3EE5E6B4B0D3255BFEF95601890AFD80709	(not available)

Notes:

%AppData% is a variable that refers to the file system directory that serves as a common repository for application-specific data. A typical path is C:\Documents and Settings\[UserName]\Application Data.
%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).

The following directory was created:

%AppData%\FBDC89D4

Memory Modifications

There were new processes created in the system:

Process Name	Process Filename	Main Module Size
kb00441600.exe	%AppData%\kb00441600.exe	135,168 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	163,840 bytes

Registry Modifications

The following Registry Keys were created:

HKEY_CURRENT_USER\Software\Microsoft\Windows Media Center
HKEY_CURRENT_USER\Software\Microsoft\Windows Media Center\FB119394
HKEY_CURRENT_USER\Software\Microsoft\Windows Media Center\FBDC89D4

The newly created Registry Value is:

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

KB00441600.exe = ""%AppData%\KB00441600.exe""

so that KB00441600.exe runs every time Windows starts

Other details

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

Local\M00000408
Local\I00000408
Local\M00000788
Local\I00000788
Local\M000000D0
Local\I000000D0
Local\M000000DC
Local\I000000DC
Local\M0000024C
Local\I0000024C

The following Internet Connection was established:

Server Name	Server Port	Connect as User	Connection Password
kwebcommodolab.ru	443	kwebcommodolab.ru	kwebcommodolab.ru

Outbound traffic (potentially malicious)

There was an outbound traffic produced on port 443:

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