TROJ_DLOADR.BUO
Backdoor:Win32/Kelihos.F (Microsoft), Trojan-PSW.Win32.Tepfer.qolu (Kaspersky)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
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
835,072 bytes
EXE
Yes
24 Sep 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.
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\Run
NetworkVerifyer = "{Original File Path}\{Original File Name}.exe"
Other System Modifications
This Trojan adds the following registry entries:
HKEY_CURRENT_USER\Software\{Chosen Registry Key}\
{Chosen Registry Subkey}
DBSavedUse = "{Random Hex Values}"
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}c.biz
- http://{BLOCKED}g.cc
- http://{BLOCKED}c.in
NOTES:
It hides itself after execution.
SOLUTION
9.300
10.320.06
24 Sep 2013
10.321.00
25 Sep 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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- NetworkVerifyer = "{Original File Path}\{Original File Name}.exe"
- NetworkVerifyer = "{Original File Path}\{Original File Name}.exe"
- In HKEY_CURRENT_USER\Software\{Chosen Registry Key}\{Chosen Registry Subkey}
- DBSavedUse = "{Random Hex Values}"
- DBSavedUse = "{Random Hex Values}"
Step 4
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DLOADR.BUO. 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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