TROJ_HARNIG.EZ
TrojanDownloader:Win32/Harnig.gen!P, Trojan:Win32/Alureon.CT, HackTool:Win32/Keygen (Microsoft); [UPDATE.EXE]:Generic Downloader.x!ckb, [AAC201~1.EXE]:Generic KeyGen. (McAfee); Backdoor.Trojan (Symantec); ARC:CAB, ARC:[update.exe]:CAB, [update.exe/update1.exe]:Packed.Win32.Krap.x, [update.exe/update2.exe (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); Dropped:Trojan.Generic.2924420 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
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
328,192 bytes
EXE
Yes
14 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.
Installation
This Trojan creates the following folders:
- %User Temp%\IXP000.TMP
- %User Temp%\IXP001.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.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunOnce
wextract_cleanup0 = "rundll32.exe %System%\advpack.dll,DelNodeRunDLL32 "%User Temp%\IXP000.TMP\""
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunOnce
wextract_cleanup1 = "rundll32.exe %System%\advpack.dll,DelNodeRunDLL32 "%User Temp%\IXP001.TMP\""
Dropping Routine
This Trojan drops the following files:
- %User Temp%\IXP000.TMP\TMP4351$.TMP
- %User Temp%\IXP000.TMP\update.exe
- %User Temp%\IXP000.TMP\AAC201~1.EXE
- %User Temp%\IXP001.TMP\TMP4351$.TMP
- %User Temp%\IXP001.TMP\update1.exe
- %User Temp%\IXP001.TMP\update2.exe
(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.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}er.com/tdfpmmn/irxhiiffp.php?adv=adv462
- http://{BLOCKED}er.com/tdfpmmn/ohnbbyyif.php?adv=adv462
This report is generated via an automated analysis system.
SOLUTION
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
Restart in Safe Mode
Step 3
Delete this registry value
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\Windows\CurrentVersion\RunOnce
- wextract_cleanup0="rundll32.exe %System%\advpack.dll,DelNodeRunDLL32 "%User Temp%\IXP000.TMP\""
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce
- wextract_cleanup1="rundll32.exe %System%\advpack.dll,DelNodeRunDLL32 "%User Temp%\IXP001.TMP\""
Step 4
Search and delete these folders
- %User Temp%\IXP000.TMP
- %User Temp%\IXP001.TMP
Step 5
Search and delete these files
- %User Temp%\IXP000.TMP\TMP4351$.TMP
- %User Temp%\IXP000.TMP\update.exe
- %User Temp%\IXP000.TMP\AAC201~1.EXE
- %User Temp%\IXP001.TMP\TMP4351$.TMP
- %User Temp%\IXP001.TMP\update1.exe
- %User Temp%\IXP001.TMP\update2.exe
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_HARNIG.EZ. 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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