TSPY_KEYLOGGER.YAC
PWS:Win32/Dyzap.X [non_writable_container] (Microsoft); Trojan.Gen.2 (Symantec); Trojan-Spy.Win32.Recam.aeui (Kaspersky); Troj/Fareit-CGB (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Inject3.CNZI (AVG)
Windows
Threat Type: Spyware
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Spyware 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
Arrival Details
This Spyware 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 Spyware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{malware file name} = "%User Profile%\Application Data\ASound.exe"
Other System Modifications
This Spyware deletes the following files:
- %System Root%\aspr_keys.ini
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Intel\
Indeo\5.0
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Intel\
Indeo\5.0
EnabledAccessKey = "0"
HKEY_CURRENT_USER\Software\Intel\
Indeo\5.0
AccessKey = "0"
HKEY_CURRENT_USER\Software\Intel\
Indeo\5.0
MinViewportWidth = "0"
HKEY_CURRENT_USER\Software\Intel\
Indeo\5.0
MinViewportHeight = "0"
HKEY_CURRENT_USER\Software\Intel\
Indeo\5.0
Transparency = "1"
HKEY_CURRENT_USER\Software\Intel\
Indeo\5.0
QuickCompress = "0"
HKEY_CURRENT_USER\Software\Intel\
Indeo\5.0
Scalability = "0"
Dropping Routine
This Spyware drops the following files:
- %System%\.Identifier
- %User Startup%\ABsound.exe
(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %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 Spyware connects to the following possibly malicious URL:
- {BLOCKED}0.1
- {BLOCKED}.125.119
This report is generated via an automated analysis system.
SOLUTION
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 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\Intel\Indeo
- 5.0
Step 4
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
- {malware file name} = "%User Profile%\Application Data\ASound.exe"
- In HKEY_CURRENT_USER\Software\Intel\Indeo\5.0
- EnabledAccessKey = "0"
- In HKEY_CURRENT_USER\Software\Intel\Indeo\5.0
- AccessKey = "0"
- In HKEY_CURRENT_USER\Software\Intel\Indeo\5.0
- MinViewportWidth = "0"
- In HKEY_CURRENT_USER\Software\Intel\Indeo\5.0
- MinViewportHeight = "0"
- In HKEY_CURRENT_USER\Software\Intel\Indeo\5.0
- Transparency = "1"
- In HKEY_CURRENT_USER\Software\Intel\Indeo\5.0
- QuickCompress = "0"
- In HKEY_CURRENT_USER\Software\Intel\Indeo\5.0
- Scalability = "0"
Step 5
Search and delete these components
- %System%\.Identifier
- %User Startup%\ABsound.exe
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_KEYLOGGER.YAC. 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%\aspr_keys.ini
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