TROJ_COSSTA.SZT
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/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.
TECHNICAL DETAILS
184,320 bytes
EXE
No
30 May 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 creates the following folders:
- %System Root%\config
- %System Root%\config\ref
- %User Temp%\temp_log
- %User Temp%\temp_log\chat
- %User Temp%\temp_log\tmp
- %User Temp%\plugins
- %User Temp%\pls
- %User Temp%\goo
- %User Temp%\vyq80f37ae00d1e159a3dea89
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Other System Modifications
This Trojan deletes the following files:
- %System Root%\strings.txt
- %System Root%\AUTOEXEC.BAT
- %System Root%\config\tm.t
- %System Root%\config\script.txt
- %System Root%\config\update.txt
- %System Root%\config\configure
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It deletes the following folders:
- %User Temp%\Microsoft .NET Framework 4 Setup_4.0.30319
- %User Temp%\Microsoft Visual C++ 2010 x86 Redistributable Setup_10.0.30319
- %User Temp%\{835818DD-220C-4ABD-946E-0D8660B95E29}
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Dropping Routine
This Trojan drops the following files:
- %User Startup%\{malware file name}.lnk
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://www.{BLOCKED}o.hu/portal/actions/admin/perm/.../strings.txt
- http://{BLOCKED}inemax.net/js/info/strings.txt
- http://www.{BLOCKED}lm.com.ua/forum/files/.../strings.txt
- http://www.{BLOCKED}e.com.br
- http://www.{BLOCKED}o.com
- http://www.{BLOCKED}n.com
- http://www.{BLOCKED}a.com.br
- http://www.{BLOCKED}ess.com
- {BLOCKED}.36.61
- {BLOCKED}202.89
- {BLOCKED}.4.62
- {BLOCKED}0.1
- {BLOCKED}.228.223
- {BLOCKED}.183.24
- {BLOCKED}2.82.163
- {BLOCKED}3.13.21
- {BLOCKED}.244.116
- {BLOCKED}.228.215
This report is generated via an automated analysis system.
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
Search and delete this file
- %User Startup%\{malware file name}.lnk
Step 3
Search and delete these folders
- %System Root%\config
- %System Root%\config\ref
- %User Temp%\temp_log
- %User Temp%\temp_log\chat
- %User Temp%\temp_log\tmp
- %User Temp%\plugins
- %User Temp%\pls
- %User Temp%\goo
- %User Temp%\vyq80f37ae00d1e159a3dea89
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_COSSTA.SZT. 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.
Step 5
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %System Root%\strings.txt
- %System Root%\AUTOEXEC.BAT
- %System Root%\config\tm.t
- %System Root%\config\script.txt
- %System Root%\config\update.txt
- %System Root%\config\configure
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