ThreatExpert Report: Trojan-Banker.Win32.Banker

Submission Summary:

Submission details:

Submission received: 18 September 2012, 02:00:58
Processing time: 10 min 8 sec
Submitted sample:

File MD5: 0xEAA62FA3CE0857F7FECB1E829CE98B82
File SHA-1: 0x956CC80F357BB372C3879C5C4C85BCFAFCC1BE5E
Filesize: 299,242 bytes
Alias: Trojan-Banker.Win32.Banker [Ikarus]

Summary of the findings:

What's been found	Severity Level
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	c:\DelUS.bat	124 bytes	MD5: 0x68ED47C0DCEB3CC6ACC2AB3BEDB4C74C SHA-1: 0x44CDDA23DD8EB2C78CF524056F1B5A08834E724A	(not available)
2	%AppData%\nsignup.exe	246,784 bytes	MD5: 0xC95163039B2C340356CA9E55830B9434 SHA-1: 0xD89477D972131E871E8A76C51E6D5E3CF8A92FD2	Trojan-Banker.Win32.Banker [Ikarus] packed with UPX [Kaspersky Lab]
3	[file and pathname of the sample #1]	299,242 bytes	MD5: 0xEAA62FA3CE0857F7FECB1E829CE98B82 SHA-1: 0x956CC80F357BB372C3879C5C4C85BCFAFCC1BE5E	Trojan-Banker.Win32.Banker [Ikarus]

Note:

%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.

The following directory was created:

%AppData%\signup

Memory Modifications

There were new processes created in the system:

Process Name	Process Filename	Main Module Size
nsignup.exe	%AppData%\nsignup.exe	663,552 bytes
[filename of the sample #1]	[file and pathname of the sample #1]	188,416 bytes

Registry Modifications

The following Registry Keys were created:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\signup
HKEY_CURRENT_USER\Software\niesignup

The newly created Registry Values are:

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

nsignup35 = "%AppData%\nsignup.exe"

so that nsignup.exe runs every time Windows starts

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

signup = "%AppData%\signup\nsignup.exe"

so that nsignup.exe runs every time Windows starts

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\signup]

DisplayIcon = "%AppData%\signup\nsudelete.exe,0"
DisplayName = "signup"
UninstallString = ""%AppData%\signup\nsudelete.exe""

[HKEY_CURRENT_USER\Software\niesignup]

User = "00CD1A40_127625711"
Partner = "dark1"

Other details

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

Republic of Korea

To mark the presence in the system, the following Mutex object was created:

nsignup_09876

The following Host Names were requested from a host database:

down.signup.kr
www.keymatch.co.kr

The following HTTP URLs were started reading:

http://www.keymatch.co.kr/app_new/install_new.php?u=dark1&a=00CD1A40_127625711&m=i&s=nsu0918&aff=signup
http://down.signup.kr/new_file/signup.dat

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