TROJ_LURK.AC
TrojanSpy:Win32/Lurk.A (Microsoft); PWS-Zbot.gen.kx (McAfee); Trojan.Filurkes (Symantec); Trojan-Spy.Win32.Lurk.t (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.6451753 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
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.
It deletes itself after execution.
TECHNICAL DETAILS
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 deletes the following files:
- %System%\abc.dll
- %User Temp%\1.TMP
- %User Temp%\P28837~1.CMD
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.. %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.)
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
NetSh
1 = "%User Temp%\1.tmp"
(Note: The default value data of the said registry entry is ipmontr.dll.)
Dropping Routine
This Trojan drops the following files:
- %User Temp%\1.tmp
- %User Temp%\p2883746343.cmd
- %System%\mm.dll
- %System%\abc.dll
(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.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}nd.comsearch?{random characters}
It deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
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
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\NetSh
- From: 1 = "%User Temp%\1.tmp"
To: 1 = ""ipmontr.dll""
- From: 1 = "%User Temp%\1.tmp"
Step 3
Search and delete these files
- %User Temp%\1.tmp
- %User Temp%\p2883746343.cmd
- %System%\mm.dll
- %System%\abc.dll
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_LURK.AC. 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.
Step 5
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %System%\abc.dll
- %User Temp%\1.TMP
- %User Temp%\P28837~1.CMD
Did this description help? Tell us how we did.