WORM_SWISYN.SMA
Trojan:Win32/Dursg.C (Microsoft); Swisyn.ai (McAfee); Trojan.Gen (Symantec); P2P-Worm.Win32.Agent.anx (Kaspersky); Trojan.Win32.Generic.pak!cobra (Sunbelt); Gen:Heur.IPZ.3 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This worm 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 worm 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 worm drops the following copies of itself into the affected system:
- %User Profile%\SystemProc\lsass.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.)
It creates the following folders:
- %Program Files%\Mozilla Firefox\
- %Program Files%\Mozilla Firefox\extensions\
- %Program Files%\Mozilla Firefox\extensions\{9CE11043-9A15-4207-A565-0C94C42D590D}\
- %Program Files%\Mozilla Firefox\extensions\{9CE11043-9A15-4207-A565-0C94C42D590D}\chrome\
- %Program Files%\Mozilla Firefox\extensions\{9CE11043-9A15-4207-A565-0C94C42D590D}\chrome\content\
- %User Profile%\Application Data\SystemProc
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %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 worm deletes the following files:
- {malware path and file name}
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
It adds the following registry entries:
HKEY_CURRENT_USER\Identities
KillSelf = "ok"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
RTHDBPL = "{malware path and file name}"
HKEY_CURRENT_USER\Identities
Curr version = "21"
HKEY_CURRENT_USER\Identities
First Start = "{malware path and file name}"
HKEY_CURRENT_USER\Identities
Last Date = "30-9-2011"
HKEY_CURRENT_USER\Identities
Send Inst = "ok"
HKEY_CURRENT_USER\Identities
Inst Date = "30-9-2011"
HKEY_CURRENT_USER\Identities
Popup count = "0"
HKEY_CURRENT_USER\Identities
Popup time = "0"
HKEY_CURRENT_USER\Identities
Popup date = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
RTHDBPL = "%User Profile%\SystemProc\lsass.exe"
Dropping Routine
This worm drops the following files:
- %Program Files%\Mozilla Firefox\extensions\{9CE11043-9A15-4207-A565-0C94C42D590D}\install.rdf
- %Program Files%\Mozilla Firefox\extensions\{9CE11043-9A15-4207-A565-0C94C42D590D}\chrome.manifest
- %Program Files%\Mozilla Firefox\extensions\{9CE11043-9A15-4207-A565-0C94C42D590D}\chrome\content\timer.xul
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
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
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer
- Run
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\Identities
- KillSelf="ok"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- RTHDBPL="{malware path and file name}"
- In HKEY_CURRENT_USER\Identities
- Curr version="21"
- In HKEY_CURRENT_USER\Identities
- First Start="{malware path and file name}"
- In HKEY_CURRENT_USER\Identities
- Last Date="30-9-2011"
- In HKEY_CURRENT_USER\Identities
- Send Inst="ok"
- In HKEY_CURRENT_USER\Identities
- Inst Date="30-9-2011"
- In HKEY_CURRENT_USER\Identities
- Popup count="0"
- In HKEY_CURRENT_USER\Identities
- Popup time="0"
- In HKEY_CURRENT_USER\Identities
- Popup date="0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- RTHDBPL="%User Profile%\SystemProc\lsass.exe"
Step 4
Search and delete these folders
- %Program Files%\Mozilla Firefox\
- %Program Files%\Mozilla Firefox\extensions\
- %Program Files%\Mozilla Firefox\extensions\{9CE11043-9A15-4207-A565-0C94C42D590D}\
- %Program Files%\Mozilla Firefox\extensions\{9CE11043-9A15-4207-A565-0C94C42D590D}\chrome\
- %Program Files%\Mozilla Firefox\extensions\{9CE11043-9A15-4207-A565-0C94C42D590D}\chrome\content\
- %User Profile%\Application Data\SystemProc
Step 5
Search and delete these files
- %Program Files%\Mozilla Firefox\extensions\{9CE11043-9A15-4207-A565-0C94C42D590D}\install.rdf
- %Program Files%\Mozilla Firefox\extensions\{9CE11043-9A15-4207-A565-0C94C42D590D}\chrome.manifest
- %Program Files%\Mozilla Firefox\extensions\{9CE11043-9A15-4207-A565-0C94C42D590D}\chrome\content\timer.xul
Step 6
Scan your computer with your Trend Micro product to delete files detected as WORM_SWISYN.SMA. 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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