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Virus:TR/Krypt.ehl.228352
Date discovered:18/05/2010
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:228.352 Bytes
MD5 checksum:6942724549097e9ddd95a338b998a433
IVDF version:7.10.07.130 - Tuesday, May 18, 2010

 General Aliases:
   •  Sophos: Mal/Agent-AS
   •  Bitdefender: Trojan.Generic.KD.12471
   •  Panda: W32/Pinit.L.worm
   •  Eset: Win32/Pinit.AF


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Downloads malicious files
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following location:
   • %SYSDIR%\cooper.mine



It deletes the following file:
   • %SYSDIR%\pgxahdwvzy



The following files are created:

%SYSDIR%\user32.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Patched.Gen2

%SYSDIR%\agzrngg Further investigation pointed out that this file is malware, too. Detected as: TR/Patched.Gen2

%SYSDIR%\dllcache\user32.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Patched.Gen2

%SYSDIR%\pgxahdwvzy Further investigation pointed out that this file is malware, too. Detected as: TR/Patched.Gen2

%SYSDIR%\h7t.wt
%SYSDIR%\hgtd.ruy
%temporary internet files%\r[1].php
%SYSDIR%\nmklo.dll



It tries to download some files:

– The location is the following:
   • http://polujopa.com/tpsa/gate/**********


– The location is the following:
   • http://adobecompany.co.uk/tpsa/**********


– The location is the following:
   • http://adobecompany.co.uk/tpsa/**********




It tries to executes the following file:

– Filename:
   • "%SYSDIR%\Wbem\wmic.exe" path win32_terminalservicesetting where (__Class!="") call setallowtsconnections 1

 Registry The following registry keys are added:

– [HKLM\SOFTWARE\9]
   • "31897356954C2CD3D41B221E3F24F99BBA"=dword:0x00bbdf19
   • "31AC70412E939D72A9234CDEBB1AF5867B"="%character string%"
   • "31C2E1E4D78E6A11B88DFA803456A1FFA5"=dword:0x00000000

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion]
   • "MID"="F0998D6076FC4887B1F92F247CE0EE8CF48D83CDBA1B4A5E9FFBA78C9F0142E9"

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows]
   • "Appisqt_Dlls"="nmklo"

– [HKLM\SOFTWARE\1]
   • "31897356954C2CD3D41B221E3F24F99BBA"=dword:0x00bbdf19
   • "31AC70412E939D72A9234CDEBB1AF5867B"="%character string%"
   • "31C2E1E4D78E6A11B88DFA803456A1FFA5"=dword:0x00000000

– [HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\
   Licensing Core]
   • "EnableConcurrentSessions"=dword:0x00000001



The following registry key is changed:

– [HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server]
   New value:
   • "fDenyTSConnections"=dword:0x00000000

 Backdoor The following ports are opened:

– 174.36.1**********.1********** on TCP port 4521
– 174.36.1**********.1********** on TCP port 55039
– 174.36.1**********.1********** on TCP port 51534

 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Petre Galan on Wednesday, July 14, 2010
Description updated by Petre Galan on Tuesday, July 20, 2010

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