TROJ_INJEBER.A
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.
It deletes itself after execution.
TECHNICAL DETAILS
1,507,328 bytes
EXE
Yes
30 Nov 2016
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:
- %User Profile%\Application Data\skjxjkbyht.exe
(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.)
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
skjxjkbyht = "%User Profile%\Application Data\skjxjkbyht.exe"
Other System Modifications
This Trojan deletes the following files:
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.1996.444265
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.1996.444281
- %User Profile%\v2.0.50727.42\security.config.cch.1996.444437
- {malware path and file name}:zone.identifier
(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %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.)
Dropping Routine
This Trojan drops the following files:
- %User Startup%\skjxjkbyht.vbs
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)
Other Details
This Trojan connects to the following possibly malicious URL:
- 78.47.139.102
- 127.0.0.1
It deletes itself after execution.
This report is generated via an automated analysis system.
SOLUTION
9.8
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
- skjxjkbyht = "%User Profile%\Application Data\skjxjkbyht.exe"
Step 4
Search and delete this file
- %User Startup%\skjxjkbyht.vbs
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_INJEBER.A. 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 6
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.
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.1996.444265
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.1996.444281
- %User Profile%\v2.0.50727.42\security.config.cch.1996.444437
- {malware path and file name}:zone.identifier
Did this description help? Tell us how we did.