TROJ_AGENTE.DXEN
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.
It does not have any propagation routine.
It does not have any backdoor routine.
It does not have any downloading capability.
It does not have any information-stealing capability.
TECHNICAL DETAILS
36864 bytes
EXE
No
26 Nov 2012
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 files:
- %Windows%\setupa.tmp
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
It creates the following folders:
- %Windows%\$NtUninstallKB09527$
- %Windows%\$NtUninstallKB09527$\spuninst
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
Autostart Technique
This Trojan registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\DirectX Extended
Propagation
This Trojan does not have any propagation routine.
Backdoor Routine
This Trojan does not have any backdoor routine.
Download Routine
This Trojan does not have any downloading capability.
Information Theft
This Trojan does not have any information-stealing capability.
NOTES:
This Trojan retrieves its settings from the following configuration file:
- %Current%\cfg.dat
It monitors for removable drives inserted in the affected system. Once triggered, it will copy user files with pre-defined file names and specific file types.
The file name and type depends on its configuration file.
The file name is determined by the F1 - F100 keys under [FILE] section of the configuration file.
By default, it copies .ppt and .doc user files and saves them to the following folder:
- %Windows%\$NtUninstallKB09527$\
If it fails to do so, it will try to save the copied file to the following folder:
- %Windows%\$NtUninstallKB09527$\spuninst
It renames the copied files by changing the last letter of the file extension to '-'. (e.g.
Then, it will log the properties of the copied files to %Windows%\setupa.tmp.
The said .tmp file also contains the following strings on the start and end of the file, respectively:
- *************start********************
- *************stop*********************
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
9.300
9.554.02
26 Nov 2012
9.555.00
27 Nov 2012
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Scan your computer with your Trend Micro product and note files detected as TROJ_AGENTE.DXEN
Step 3
Delete this registry key
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- DirectX Extended
- DirectX Extended
Step 4
Search and delete this folder
- %Windows%\$NtUninstallKB09527$
Step 5
Search and delete this file
- %Windows%\setupa.tmp
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENTE.DXEN. 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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