TROJ_DLOADR.KLI
Windows
![](/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 does not have any propagation routine.
As of this writing, the said sites are inaccessible.
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.
Installation
This Trojan drops the following copies of itself into the affected system:
- {All Users' My Music folder}\AcroRdInfo.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
ShStatEXE = "{All Users' My Music folder}\AcroRdInfo.exe"
Propagation
This Trojan does not have any propagation routine.
Download Routine
This Trojan accesses the following websites to download files:
- http://{BLOCKED}s.com/info/info.php
It saves the files it downloads using the following names:
- %User Temp%\Perf{random}.dat
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
As of this writing, the said sites are inaccessible.
NOTES:
It drops the following file as part of processing contents(decryption etc.) of 'Perf{random}.dat':
- %User Temp%\Perf{random}.b6
It drops the following final output file:
- %User Temp%\Perf{random}.exe -it execute this file if file type is executable by determining the header in its code
It will also delete the following files afterwards:
- %User Temp%\Perf{random}.b6
- %User Temp%\Perf{random}.dat
- %User Temp%\Perf{random}.exe -will be deleted if not executable by determining the header in its code
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
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
- ShStatEXE = "{All Users' My Music folder}\AcroRdInfo.exe"
- ShStatEXE = "{All Users' My Music folder}\AcroRdInfo.exe"
Step 4
Search and delete these files
- %User Temp%\Perf{random}.dat
- %User Temp%\Perf{random}.b6
- %User Temp%\Perf{random}.exe
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADR.KLI. 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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