TROJ_PROXYCHANGER.AD
Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Downloader.Banload.CNKV (AVG)
Windows 2000, Windows XP, Windows Server 2003
![](/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
622,080 bytes
EXE
Yes
07 Jun 2013
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.
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
SkypeAutoConect.exe = "%Windows%\SkypeAutoConect.exe"
Other System Modifications
This Trojan deletes the following files:
- %System Root%\sxe1.tmp
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
AutoConfigUrl = "http://{BLOCKED}.93.23/U9E4917029UN610ZXVC4.pac"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
AntiVirusDisableNotify = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
FirewallDisableNotify = "1"
Dropping Routine
This Trojan drops the following files:
- %System Root%\sxe3.tmp
- %System Root%\sxe7.tmp
- %Windows%\Active.bat
- %Windows%\SkypeAutoConect.log
- %Windows%\SkypeAutoConect.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Windows% is the Windows folder, which is usually C:\Windows.)
This report is generated via an automated analysis system.
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
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
- SkypeAutoConect.exe = "%Windows%\SkypeAutoConect.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
- AutoConfigUrl = "http://{BLOCKED}.93.23/U9E4917029UN610ZXVC4.pac"
Step 4
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- AntiVirusDisableNotify = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- FirewallDisableNotify = "1"
Step 5
Search and delete these components
- %System Root%\sxe3.tmp
- %System Root%\sxe7.tmp
- %Windows%\Active.bat
- %Windows%\SkypeAutoConect.log
- %Windows%\SkypeAutoConect.exe
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_PROXYCHANGER.AD. 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 7
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%\sxe1.tmp
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