TROJ_UPATRE.BF
None as of 10/24/2013
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
Downloaded from the Internet, Dropped by other malware
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.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
TCP Port 443
21,504 bytes
EXE
No
24 Oct 2013
Connects to URLs/IPs, Downloads files
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 copies of itself into the affected system and executes them:
- %User Temp%\kier.exe
(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.)
Other System Modifications
This Trojan modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
MigrateProxy = "1"
(Note: The default value data of the said registry entry is "0".)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
ProxyEnable = "0" - Modifies if previous value is "1".
(Note: The default value data of the said registry entry is "0" .)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
ZoneMap
ProxyBypass = "1"
(Note: The default value data of the said registry entry is "0".)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
ZoneMap
IntranetName = "1"
(Note: The default value data of the said registry entry is "0".)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
ZoneMap
UNCAsIntranet = "1"
(Note: The default value data of the said registry entry is "0".)
Download Routine
This Trojan connects to the following website(s) to download and execute a malicious file:
- https://{BLOCKED}inetenerife.com
It saves the files it downloads using the following names:
- %User Temp%\kinas.exe - detected as TSPY_ZBOT.SMC3
(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.)
It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.
Other Details
This Trojan deletes the initially executed copy of itself
NOTES:
It downloads TSPY_ZBOT.SMC3 through a HTTPS connection.
SOLUTION
9.300
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
Restart in Safe Mode
Step 3
Search and delete these files
- %User Temp%\kier.exe
Step 4
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
- From: MigrateProxy = "1"
To: MigrateProxy = "0"
- From: MigrateProxy = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
- From: ProxyEnable = "0"
To: ProxyEnable = "0" - restore to 1 if previous value is 1.
- From: ProxyEnable = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap
- From: ProxyBypass = "1"
To: ProxyBypass = "0"
- From: ProxyBypass = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap
- From: IntranetName = "1"
To: IntranetName = "0"
- From: IntranetName = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap
- From: UNCAsIntranet = "1"
To: UNCAsIntranet = "0"
- From: UNCAsIntranet = "1"
Step 5
Remove malware/grayware files dropped/downloaded by TROJ_UPATRE.BF
- TSPY_ZBOT.SMC3
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_UPATRE.BF. 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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