TROJ_FAKEAV.YSXO
Trojan:Win32/Bulta!rfn (Microsoft); Trojan.Klovbot (Symantec); Trojan.Win32.Llac.jzsc (Kaspersky); Troj/Agent-ANTV (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Inject2.CJJZ (AVG)
Windows
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
1,772,032 bytes
EXE
No
12 Jul 2015
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:
- %User Profile%\Application Data\Internet Security
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\DC3_FEXEC
Dropping Routine
This Trojan drops the following files:
- %User Profile%\Internet Security\insecure.exe
- %User Profile%\Internet Security\insecure.bat
- %User Startup%\Internet Security.vbs
- %User Temp%\WENG.jpg
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %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.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
Other Details
This Trojan connects to the following possibly malicious URL:
- {BLOCKED}2.194.140
This report is generated via an automated analysis system.
SOLUTION
9.750
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
Delete this registry key
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
- DC3_FEXEC
Step 3
Search and delete these components
- %User Profile%\Internet Security\insecure.exe
- %User Profile%\Internet Security\insecure.bat
- %User Startup%\Internet Security.vbs
- %User Temp%\WENG.jpg
Step 4
Search and delete this folder
- %User Profile%\Application Data\Internet Security
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_FAKEAV.YSXO. 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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