TROJ_DLOADR.XRI
Mal/EncPk-ZC(Sophos), W32/DLOADR.XRI!tr(Fortinet), Trojan.Win32.Spy(Ikarus)
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: 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 executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system. As of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
20,480 bytes
EXE
Yes
11 Mar 2014
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 non-malicious file:
- %Application Data%\NetworkWorkshop\K_5dwd556.n1s
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It creates the following folders:
- %Application Data%\Business Objects
- %Application Data%\NetworkWorkshop
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- ifuckjp10hkk0
Download Routine
This Trojan accesses the following websites to download files:
- kerch.{BLOCKED}i.com/_ktin_si/index.htm
- kerch.{BLOCKED}i.com/_ktin_si/or.txt
It saves the files it downloads using the following names:
- %Application Data%\Business Objects\index.txt
- %Application Data%\Business Objects\or.exe
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
As of this writing, the said sites are inaccessible.
NOTES:
This Trojan reads the content of the downloaded file %Application Data%\Business Objects\index.txt. It then looks for the following strings:
- httennnnntion
- ktteeeempts
It also decrypts and executes the file %Application Data%\Business Objects\or.exe.
SOLUTION
9.700
10.658.03
11 Mar 2014
10.659.00
12 Mar 2014
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_DLOADR.XRI
Step 3
Terminate a process file/s detected as TROJ_DLOADR.XRI
*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.
Step 4
Search and delete these folders
- %Application Data%\Business Objects
- %Application Data%\NetworkWorkshop
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADR.XRI. 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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