BAT_PASSTEAL.TY
BAT/PSW.Agent.BD trojan (NOD32),
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
Dropped by other malware
This Trojan may be dropped by other malware.
It bypasses the Windows firewall. This allows the malware to perform its intended routine without being detected by an installed firewall.
TECHNICAL DETAILS
1,592 bytes
BAT
04 Jun 2014
Modifies files
Arrival Details
This Trojan may be dropped by the following malware:
- TSPY_PASSTEAL.TY
Installation
This Trojan creates the following folders:
- %All Users Profile%\Msn
- %All Users Profile%\Msn\Msn2
(Note: %All Users Profile% is the All Users or Common profile folder, which is C:\Documents and Settings\All Users in Windows 2000, XP, and Server 2003, and C:\ProgramData in Windows Vista and 7.)
Other System Modifications
This Trojan modifies the following registry entries to disable the Windows Firewall settings:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parametes\
FirewallPolicy\StandardProfile
Enable Firewall = "0"
(Note: The default value data of the said registry entry is "1".)
Drop Points
This Trojan uploads files to the following File Transfer Protocol (FTP) sites:
- {BLOCKED}f.{BLOCKED}3.com
- {BLOCKED}.{BLOCKED}h.com
NOTES:
This trojan renames files with extension .abc to .exe in current path folder.
It delete files with the following file extensions:
- *.001
- *.002
- *.003
- *.004
- *.005
- *.006
- *.007
- *.007
- *.008
- *.009
- *.010
- *.011
- *.012
- *.013
- *.014
- *.015
- *.016
- *.017
- *.018
- *.019
- *.020
- *.021
- *.022
- *.023
- *.024
- *.025
- *.026
- *.027
- *.028
- *.029
- *.030
- *.031
- *.032
- *.033
- *.jpe
- *.jpg
- *.jpeg
It executes other components of TSPY_PASSTEAL.TY.
It executes the following files with its command line parameters:
- images.exe wmsn.klb
- image.exe -f msn.klc
- picture viewer.exe -f wmsn.klc
- mdej.exe
- cogj.reg
It modifies the file attributes of files under the following folder to read only, archive, system and hidden.
- %All Users Profile%\Msn
- %All Users Profile%\Msn\Msn2
- %System Root%\users\public\Public Document
It renames the following files:
- msn.kla to PIC_{date-yyyyddmm}_{time}.16
- wmsn.klb to PIC_{date-yyyyddmm}_{time}.17
- msn.klc to 001_{date-yyyyddmm}_{time}.33
- wmsn.klb to 001_{date-yyyyddmm}_{time}.34
- msn.klc to 001_{date-yyyyddmm}_{time}.35
SOLUTION
9.700
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 BAT_PASSTEAL.TY. (Note: Please skip this step if the threat(s) listed below have already been removed.)
- TSPY_PASSTEAL.TY
Step 3
Restore this modified 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\SYSTEM\CurrentControlSet\Services\SharedAccess\Parametes\FirewallPolicy\StandardProfile
- From: Enable Firewall = "0"
To: Enable Firewall = "1"
- From: Enable Firewall = "0"
Step 4
Search and delete these folders
- %All Users Profile%\Msn
Step 5
Scan your computer with your Trend Micro product to delete files detected as BAT_PASSTEAL.TY. 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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