TROJ_KULUOZ.PYR
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
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 connects to a website to send and receive information.
It deletes itself after execution.
TECHNICAL DETAILS
40,960 bytes
EXE
Yes
18 Apr 2013
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 drops a copy of itself in the following folders using different file names:
- %AppDataLocal%\{random file name}.exe
(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local on Windows Vista and 7.)
It leaves the following text files:
- {Malware Path and Filename}.txt
It injects threads into the following normal process(es):
- svchost.exe
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = %AppDataLocal%\{random file name}.exe"
Backdoor Routine
This Trojan connects to the following websites to send and receive information:
- http://{BLOCKED}.134.239:8080
- http://{BLOCKED}.58.68:8080
- http://{BLOCKED}.25.10:8080
- http://{BLOCKED}.139.235:8080
- http://{BLOCKED}.199.40:8080
Other Details
This Trojan deletes itself after execution.
SOLUTION
9.300
9.864.07
18 Apr 2013
9.865.00
19 Apr 2013
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {random} = "%AppDataLocal%\{random file name}.exe"
- {random} = "%AppDataLocal%\{random file name}.exe"
Step 4
Search and delete these components
- {Malware Path and Filename}.txt
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_KULUOZ.PYR. 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 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_KULUOZ.PYR. 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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