TROJ_SCAR.NXAA
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
435,788 bytes
EXE
No
02 Jun 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 creates the following folders:
- %User Profile%\Application Data\85A7F
(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 deletes the following files:
- %User Profile%\S-1-5-21-1645522239-1292428093-682003330-1003\371f15c467fd3ea50326e6d328ac6180_6abce574-4afc-42c5-8ab9-5739a84d8a8b
(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.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_BROWSER_EMULATION
HKEY_LOCAL_MACHINE\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_BROWSER_EMULATION
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Policies\Microsoft\Windows\
CurrentVersion\Internet Settings\Security_HKLM_only
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\CurrentVersion\
Internet Settings\Security_HKLM_only
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_ENABLE_CLIPCHILDREN_OPTIMIZATION
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_AJAX_CONNECTIONEVENTS
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_GPU_RENDERING
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_WEBOC_DOCUMENT_ZOOM
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_ALIGNED_TIMERS
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_DISABLE_NAVIGATION_SOUNDS
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_NINPUT_LEGACYMODE
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_DISABLE_MK_PROTOCOL
HKEY_CURRENT_USER\Software\98Soft\
Software
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_BROWSER_EMULATION
7FF09.exe = "1f4"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_BROWSER_EMULATION
7FF09.exe = "1f4"
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Policies\Microsoft\Windows\
CurrentVersion\Internet Settings\Security_HKLM_only
7FF09.exe = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\CurrentVersion\
Internet Settings\Security_HKLM_only
7FF09.exe = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_ENABLE_CLIPCHILDREN_OPTIMIZATION
7FF09.exe = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_AJAX_CONNECTIONEVENTS
7FF09.exe = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_GPU_RENDERING
7FF09.exe = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_WEBOC_DOCUMENT_ZOOM
7FF09.exe = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_ALIGNED_TIMERS
7FF09.exe = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_DISABLE_NAVIGATION_SOUNDS
7FF09.exe = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_NINPUT_LEGACYMODE
7FF09.exe = "0"
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main\FeatureControl\
FEATURE_DISABLE_MK_PROTOCOL
7FF09.exe = "0"
HKEY_CURRENT_USER\Software\98Soft\
Software
id = "10110242"
Other Details
This Trojan connects to the following possibly malicious URL:
- {BLOCKED}.77.246
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
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\Microsoft\Internet Explorer\Main\FeatureControl
- FEATURE_BROWSER_EMULATION
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Main\FeatureControl
- FEATURE_BROWSER_EMULATION
- In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Policies\Microsoft\Windows\CurrentVersion\Internet Settings
- Security_HKLM_only
- In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\CurrentVersion\Internet Settings
- Security_HKLM_only
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl
- FEATURE_ENABLE_CLIPCHILDREN_OPTIMIZATION
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl
- FEATURE_AJAX_CONNECTIONEVENTS
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl
- FEATURE_GPU_RENDERING
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl
- FEATURE_WEBOC_DOCUMENT_ZOOM
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl
- FEATURE_ALIGNED_TIMERS
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl
- FEATURE_DISABLE_NAVIGATION_SOUNDS
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl
- FEATURE_NINPUT_LEGACYMODE
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl
- FEATURE_DISABLE_MK_PROTOCOL
- In HKEY_CURRENT_USER\98Soft
- Software
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\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION
- 7FF09.exe = "1f4"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION
- 7FF09.exe = "1f4"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Security_HKLM_only
- 7FF09.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Security_HKLM_only
- 7FF09.exe = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_ENABLE_CLIPCHILDREN_OPTIMIZATION
- 7FF09.exe = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_AJAX_CONNECTIONEVENTS
- 7FF09.exe = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_GPU_RENDERING
- 7FF09.exe = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_WEBOC_DOCUMENT_ZOOM
- 7FF09.exe = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_ALIGNED_TIMERS
- 7FF09.exe = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_DISABLE_NAVIGATION_SOUNDS
- 7FF09.exe = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_NINPUT_LEGACYMODE
- 7FF09.exe = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_DISABLE_MK_PROTOCOL
- 7FF09.exe = "0"
- In HKEY_CURRENT_USER\Software\98Soft\Software
- id = "10110242"
Step 4
Search and delete this folder
- %User Profile%\Application Data\85A7F
Step 5
Scan your computer with your Trend Micro product to delete files detected as TROJ_SCAR.NXAA. 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.
- %User Profile%\S-1-5-21-1645522239-1292428093-682003330-1003\371f15c467fd3ea50326e6d328ac6180_6abce574-4afc-42c5-8ab9-5739a84d8a8b
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