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Threat Encyclopedia

TROJ_STASER.AB


PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

OVERALL RISK RATING:
DAMAGE POTENTIAL:
DISTRIBUTION POTENTIAL:
REPORTED INFECTION:

  • 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

File Size:

825,920 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

13 Sep 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.

Installation

This Trojan creates the following folders:

  • %User Profile%\Application Data\eSafe
  • %User Profile%\eSafe\log

(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 registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\EventLog\Application\
WsysSvc

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WsysControl

HKEY_LOCAL_MACHINE\SOFTWARE\eSafeSecControl

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WsysControl
DisplayName = "Wsys Control 10.2.1.2634"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WsysControl
DisplayVersion = "10.2.1.2634"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WsysControl
publisher = "Wsys Co., Ltd."

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WsysControl
UninstallString = "%User Profile%\eSafe\eGdpSvc.exe -unsvc"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WsysControl
DisplayIcon = "%User Profile%\eSafe\eGdpSvc.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\eSafeSecControl
sid = "eGdp"

HKEY_LOCAL_MACHINE\SOFTWARE\eSafeSecControl
channel = "eGdp"

HKEY_LOCAL_MACHINE\SOFTWARE\eSafeSecControl
pid = "eSafe"

HKEY_LOCAL_MACHINE\SOFTWARE\eSafeSecControl
ver = "10.2.1.2634"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
WsysSvc
EventMessageFile = "%User Profile%\eSafe\eGdpSvc.exe"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Eventlog\Application\
WsysSvc
TypesSupported = "7"

Dropping Routine

This Trojan drops the following files:

  • %User Profile%\eSafe\eGdpSvc.exe
  • %User Profile%\eSafe\eDelayinfo.edb

(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.)

This report is generated via an automated analysis system.

SOLUTION

Minimum Scan Engine:

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

[ Learn More ]

Step 3

Delete this registry key

[ Learn More ]

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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\EventLog\Application
    • WsysSvc
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
    • WsysControl
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • eSafeSecControl

Step 4

Delete this registry value

[ Learn More ]

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WsysControl
    • DisplayName = "Wsys Control 10.2.1.2634"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WsysControl
    • DisplayVersion = "10.2.1.2634"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WsysControl
    • publisher = "Wsys Co., Ltd."
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WsysControl
    • UninstallString = "%User Profile%\eSafe\eGdpSvc.exe -unsvc"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WsysControl
    • DisplayIcon = "%User Profile%\eSafe\eGdpSvc.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\eSafeSecControl
    • sid = "eGdp"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\eSafeSecControl
    • channel = "eGdp"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\eSafeSecControl
    • pid = "eSafe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\eSafeSecControl
    • ver = "10.2.1.2634"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\WsysSvc
    • EventMessageFile = "%User Profile%\eSafe\eGdpSvc.exe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\WsysSvc
    • TypesSupported = "7"

Step 5

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %User Profile%\eSafe\eGdpSvc.exe
  • %User Profile%\eSafe\eDelayinfo.edb

Step 6

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %User Profile%\Application Data\eSafe
  • %User Profile%\eSafe\log

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_STASER.AB. 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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