ALIASES:

TrojanDownloader:Win32/Karagany.F (Microsoft); Trojan.Gen.2 (Symantec); Trojan-Downloader.Win32.Agent.tkyn (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); Gen:Variant.Kazy.41789 (FSecure)

 PLATFORM:

Windows 2000, Windows, XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size: 18,944 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 04 Nov 2011

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other System Modifications

This Trojan modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\advapi32.dll[MofResourceName] = "LowDateTime:-878345984,HighDateTime:29653303***Binary mof compiled successfully"

(Note: The default value data of the said registry entry is LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\ACPI.sys[ACPIMOFResource] = "LowDateTime:-1893836544,HighDateTime:29653288***Binary mof compiled successfully"

(Note: The default value data of the said registry entry is LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\mssmbios.sys[MofResource] = "LowDateTime:246686720,HighDateTime:29653305***Binary mof compiled successfully"

(Note: The default value data of the said registry entry is LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\intelppm.sys[PROCESSORWMI] = "LowDateTime:1716098048,HighDateTime:29653287***Binary mof compiled successfully"

(Note: The default value data of the said registry entry is LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\DRIVERS\ipnat.sys[IPNATMofResource] = "LowDateTime:741130752,HighDateTime:29653288***Binary mof compiled successfully"

(Note: The default value data of the said registry entry is LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\Drivers\HTTP.sys[UlMofResource] = "LowDateTime:-2038869248,HighDateTime:29653287***Binary mof compiled successfully"

(Note: The default value data of the said registry entry is LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\Imapi
LogSessionName = "stdout"

(Note: The default value data of the said registry entry is stdout.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\Imapi
Active = 1

(Note: The default value data of the said registry entry is 1.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\Imapi
ControlFlags = 1

(Note: The default value data of the said registry entry is 1.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\Imapi\ImapiSvc
Guid = "8107d8e9-e323-49f5-bba2-abc35c243dca"

(Note: The default value data of the said registry entry is 8107d8e9-e323-49f5-bba2-abc35c243dca.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Tracing\
Microsoft\Imapi\ImapiSvc
BitNames = " ImapiDebugError ImapiDebugWarning ImapiDebugTrace ImapiDebugInfo ImapiDebugX ImapiDebugSort"

(Note: The default value data of the said registry entry is ImapiDebugError ImapiDebugWarning ImapiDebugTrace ImapiDebugInfo ImapiDebugX ImapiDebugSort.)

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\~!#1.tmp
  • %User Temp%\~!#2.tmp
  • %User Temp%\~!#3.tmp
  • %User Temp%\~!#4.tmp
  • %User Temp%\~!#5.tmp
  • %User Temp%\~!#6.tmp
  • %User Temp%\~!#7.tmp
  • %User Temp%\~!#8.tmp
  • %User Temp%\~!#9.tmp
  • %User Temp%\~!#A.tmp
  • %User Temp%\~!#B.tmp
  • %User Temp%\~!#C.tmp
  • %User Temp%\~!#D.tmp
  • %User Temp%\~!#E.tmp
  • %User Temp%\~!#F.tmp
  • %User Temp%\~!#10.tmp
  • %User Temp%\~!#11.tmp
  • %User Temp%\~!#12.tmp
  • %User Temp%\~!#13.tmp
  • %User Temp%\~!#14.tmp
  • %User Temp%\~!#15.tmp
  • %User Temp%\~!#16.tmp
  • %User Temp%\~!#17.tmp
  • %User Temp%\~!#18.tmp
  • %User Temp%\~!#19.tmp
  • %User Temp%\~!#1A.tmp
  • %User Temp%\~!#1B.tmp
  • %User Temp%\~!#1C.tmp
  • %User Temp%\~!#1D.tmp
  • %User Temp%\~!#1E.tmp
  • %User Temp%\~!#1F.tmp
  • %User Temp%\~!#20.tmp
  • %User Temp%\~!#21.tmp
  • %User Temp%\~!#22.tmp
  • %User Temp%\~!#23.tmp
  • %User Temp%\~!#24.tmp
  • %User Temp%\~!#25.tmp
  • %User Temp%\~!#26.tmp
  • %User Temp%\~!#27.tmp
  • %User Temp%\~!#28.tmp
  • %User Temp%\~!#29.tmp
  • %User Temp%\~!#2A.tmp
  • %User Temp%\~!#2B.tmp
  • %User Temp%\~!#2C.tmp
  • %User Temp%\~!#2D.tmp
  • %User Temp%\~!#2E.tmp
  • %User Temp%\~!#2F.tmp
  • %User Temp%\~!#30.tmp
  • %User Temp%\~!#31.tmp
  • %User Temp%\~!#32.tmp
  • %User Temp%\~!#33.tmp
  • %User Temp%\~!#34.tmp
  • %User Temp%\~!#35.tmp
  • %User Temp%\~!#36.tmp
  • %User Temp%\~!#37.tmp
  • %User Temp%\~!#38.tmp
  • %User Temp%\~!#39.tmp
  • %User Temp%\~!#3A.tmp
  • %User Temp%\~!#3B.tmp
  • %User Temp%\~!#3C.tmp
  • %User Temp%\~!#3D.tmp
  • %User Temp%\~!#3E.tmp
  • %User Temp%\~!#3F.tmp
  • %User Temp%\~!#40.tmp
  • %User Temp%\~!#41.tmp
  • %User Temp%\~!#42.tmp
  • %User Temp%\~!#43.tmp
  • %User Temp%\~!#44.tmp
  • %User Temp%\~!#45.tmp
  • %User Temp%\~!#46.tmp
  • %User Temp%\~!#47.tmp
  • %User Temp%\~!#48.tmp
  • %User Temp%\~!#49.tmp
  • %User Temp%\~!#4A.tmp
  • %User Temp%\~!#4B.tmp
  • %User Temp%\~!#4C.tmp
  • %User Temp%\~!#4D.tmp
  • %User Temp%\~!#4E.tmp
  • %User Temp%\~!#4F.tmp
  • %User Temp%\~!#50.tmp
  • %User Temp%\~!#51.tmp
  • %User Temp%\~!#52.tmp
  • %User Temp%\~!#53.tmp
  • %User Temp%\~!#54.tmp
  • %User Temp%\~!#55.tmp
  • %User Temp%\~!#56.tmp
  • %User Temp%\~!#57.tmp
  • %User Temp%\~!#58.tmp
  • %User Temp%\~!#59.tmp
  • %User Temp%\~!#5A.tmp
  • %User Temp%\~!#5B.tmp
  • %User Temp%\~!#5C.tmp
  • %User Temp%\~!#5D.tmp
  • %User Temp%\~!#5E.tmp
  • %User Temp%\~!#5F.tmp
  • %User Temp%\~!#60.tmp
  • %User Temp%\~!#61.tmp
  • %User Temp%\~!#62.tmp
  • %User Temp%\~!#63.tmp
  • %User Temp%\~!#64.tmp
  • %User Temp%\~!#65.tmp
  • %User Temp%\~!#66.tmp
  • %User Temp%\~!#67.tmp
  • %User Temp%\~!#68.tmp
  • %User Temp%\~!#69.tmp
  • %User Temp%\~!#6A.tmp
  • %User Temp%\~!#6B.tmp
  • %User Temp%\~!#6C.tmp
  • %User Temp%\~!#6D.tmp
  • %User Temp%\~!#6E.tmp
  • %User Temp%\~!#6F.tmp
  • %User Temp%\~!#70.tmp
  • %User Temp%\~!#71.tmp
  • %User Temp%\~!#72.tmp
  • %User Temp%\~!#73.tmp
  • %User Temp%\~!#74.tmp
  • %User Temp%\~!#75.tmp
  • %User Temp%\~!#76.tmp
  • %User Temp%\~!#77.tmp
  • %Temp%\gnh1k0rc.TMP

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://poppers.{BLOCKED}x.am/showthread.php?t=852467

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.200

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Restore this modified registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • From: %System%\advapi32.dll[MofResourceName]="LowDateTime:-878345984,HighDateTime:29653303***Binary mof compiled successfully"
      To: %System%\advapi32.dll[MofResourceName]=LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • From: %System%\DRIVERS\ACPI.sys[ACPIMOFResource]="LowDateTime:-1893836544,HighDateTime:29653288***Binary mof compiled successfully"
      To: %System%\DRIVERS\ACPI.sys[ACPIMOFResource]=LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • From: %System%\DRIVERS\mssmbios.sys[MofResource]="LowDateTime:246686720,HighDateTime:29653305***Binary mof compiled successfully"
      To: %System%\DRIVERS\mssmbios.sys[MofResource]=LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • From: %System%\DRIVERS\intelppm.sys[PROCESSORWMI]="LowDateTime:1716098048,HighDateTime:29653287***Binary mof compiled successfully"
      To: %System%\DRIVERS\intelppm.sys[PROCESSORWMI]=LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • From: %System%\DRIVERS\ipnat.sys[IPNATMofResource]="LowDateTime:741130752,HighDateTime:29653288***Binary mof compiled successfully"
      To: %System%\DRIVERS\ipnat.sys[IPNATMofResource]=LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\WDM
    • From: %System%\Drivers\HTTP.sys[UlMofResource]="LowDateTime:-2038869248,HighDateTime:29653287***Binary mof compiled successfully"
      To: %System%\Drivers\HTTP.sys[UlMofResource]=LowDateTime:-1618731008,HighDateTime:29653597***Binary mof compiled successfully
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\Imapi
    • From: LogSessionName="stdout"
      To: LogSessionName=stdout
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\Imapi
    • From: Active=1
      To: Active=1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\Imapi
    • From: ControlFlags=1
      To: ControlFlags=1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\Imapi\ImapiSvc
    • From: Guid="8107d8e9-e323-49f5-bba2-abc35c243dca"
      To: Guid=8107d8e9-e323-49f5-bba2-abc35c243dca
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Tracing\Microsoft\Imapi\ImapiSvc
    • From: BitNames=" ImapiDebugError ImapiDebugWarning ImapiDebugTrace ImapiDebugInfo ImapiDebugX ImapiDebugSort"
      To: BitNames= ImapiDebugError ImapiDebugWarning ImapiDebugTrace ImapiDebugInfo ImapiDebugX ImapiDebugSort

Step 3

Search and delete these files

[ Learn More ]
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Temp%\~!#1.tmp
  • %User Temp%\~!#2.tmp
  • %User Temp%\~!#3.tmp
  • %User Temp%\~!#4.tmp
  • %User Temp%\~!#5.tmp
  • %User Temp%\~!#6.tmp
  • %User Temp%\~!#7.tmp
  • %User Temp%\~!#8.tmp
  • %User Temp%\~!#9.tmp
  • %User Temp%\~!#A.tmp
  • %User Temp%\~!#B.tmp
  • %User Temp%\~!#C.tmp
  • %User Temp%\~!#D.tmp
  • %User Temp%\~!#E.tmp
  • %User Temp%\~!#F.tmp
  • %User Temp%\~!#10.tmp
  • %User Temp%\~!#11.tmp
  • %User Temp%\~!#12.tmp
  • %User Temp%\~!#13.tmp
  • %User Temp%\~!#14.tmp
  • %User Temp%\~!#15.tmp
  • %User Temp%\~!#16.tmp
  • %User Temp%\~!#17.tmp
  • %User Temp%\~!#18.tmp
  • %User Temp%\~!#19.tmp
  • %User Temp%\~!#1A.tmp
  • %User Temp%\~!#1B.tmp
  • %User Temp%\~!#1C.tmp
  • %User Temp%\~!#1D.tmp
  • %User Temp%\~!#1E.tmp
  • %User Temp%\~!#1F.tmp
  • %User Temp%\~!#20.tmp
  • %User Temp%\~!#21.tmp
  • %User Temp%\~!#22.tmp
  • %User Temp%\~!#23.tmp
  • %User Temp%\~!#24.tmp
  • %User Temp%\~!#25.tmp
  • %User Temp%\~!#26.tmp
  • %User Temp%\~!#27.tmp
  • %User Temp%\~!#28.tmp
  • %User Temp%\~!#29.tmp
  • %User Temp%\~!#2A.tmp
  • %User Temp%\~!#2B.tmp
  • %User Temp%\~!#2C.tmp
  • %User Temp%\~!#2D.tmp
  • %User Temp%\~!#2E.tmp
  • %User Temp%\~!#2F.tmp
  • %User Temp%\~!#30.tmp
  • %User Temp%\~!#31.tmp
  • %User Temp%\~!#32.tmp
  • %User Temp%\~!#33.tmp
  • %User Temp%\~!#34.tmp
  • %User Temp%\~!#35.tmp
  • %User Temp%\~!#36.tmp
  • %User Temp%\~!#37.tmp
  • %User Temp%\~!#38.tmp
  • %User Temp%\~!#39.tmp
  • %User Temp%\~!#3A.tmp
  • %User Temp%\~!#3B.tmp
  • %User Temp%\~!#3C.tmp
  • %User Temp%\~!#3D.tmp
  • %User Temp%\~!#3E.tmp
  • %User Temp%\~!#3F.tmp
  • %User Temp%\~!#40.tmp
  • %User Temp%\~!#41.tmp
  • %User Temp%\~!#42.tmp
  • %User Temp%\~!#43.tmp
  • %User Temp%\~!#44.tmp
  • %User Temp%\~!#45.tmp
  • %User Temp%\~!#46.tmp
  • %User Temp%\~!#47.tmp
  • %User Temp%\~!#48.tmp
  • %User Temp%\~!#49.tmp
  • %User Temp%\~!#4A.tmp
  • %User Temp%\~!#4B.tmp
  • %User Temp%\~!#4C.tmp
  • %User Temp%\~!#4D.tmp
  • %User Temp%\~!#4E.tmp
  • %User Temp%\~!#4F.tmp
  • %User Temp%\~!#50.tmp
  • %User Temp%\~!#51.tmp
  • %User Temp%\~!#52.tmp
  • %User Temp%\~!#53.tmp
  • %User Temp%\~!#54.tmp
  • %User Temp%\~!#55.tmp
  • %User Temp%\~!#56.tmp
  • %User Temp%\~!#57.tmp
  • %User Temp%\~!#58.tmp
  • %User Temp%\~!#59.tmp
  • %User Temp%\~!#5A.tmp
  • %User Temp%\~!#5B.tmp
  • %User Temp%\~!#5C.tmp
  • %User Temp%\~!#5D.tmp
  • %User Temp%\~!#5E.tmp
  • %User Temp%\~!#5F.tmp
  • %User Temp%\~!#60.tmp
  • %User Temp%\~!#61.tmp
  • %User Temp%\~!#62.tmp
  • %User Temp%\~!#63.tmp
  • %User Temp%\~!#64.tmp
  • %User Temp%\~!#65.tmp
  • %User Temp%\~!#66.tmp
  • %User Temp%\~!#67.tmp
  • %User Temp%\~!#68.tmp
  • %User Temp%\~!#69.tmp
  • %User Temp%\~!#6A.tmp
  • %User Temp%\~!#6B.tmp
  • %User Temp%\~!#6C.tmp
  • %User Temp%\~!#6D.tmp
  • %User Temp%\~!#6E.tmp
  • %User Temp%\~!#6F.tmp
  • %User Temp%\~!#70.tmp
  • %User Temp%\~!#71.tmp
  • %User Temp%\~!#72.tmp
  • %User Temp%\~!#73.tmp
  • %User Temp%\~!#74.tmp
  • %User Temp%\~!#75.tmp
  • %User Temp%\~!#76.tmp
  • %User Temp%\~!#77.tmp
  • %Temp%\gnh1k0rc.TMP

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_KRYPTIK.JOB. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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