X2KM_MDROP.A
Windows
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
TECHNICAL DETAILS
Arrival Details
This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKCU\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
My App = "%User Profile%\NTUSER.dat{random GUID}.exe"
Dropping Routine
This Trojan drops the following files:
- %User Profile%\NTUSER.dat{random GUID}.exe - BKDR_SWRORT.CP
- %User Profile%\tmp.bat
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.
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
Remove the malware/grayware file dropped/downloaded by X2KM_MDROP.A. (Note: Please skip this step if the threat(s) listed below have already been removed.)
- BKDR_SWRORT.CP
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
- My App = "%User Profile%\NTUSER.dat{random GUID}.exe"
- My App = "%User Profile%\NTUSER.dat{random GUID}.exe"
Step 4
Search and delete these components
Step 5
Scan your computer with your Trend Micro product to delete files detected as X2KM_MDROP.A. 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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