WORM_SWISYN.SMA

July 04, 2013
 ALIASES:

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)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • 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

File Size:

101,376 bytes

File Type:

EXE

Initial Samples Received Date:

30 Sep 2011

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

Minimum Scan Engine:

9.200

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

[ 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\policies\Explorer
    • Run

Step 3

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_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

[ 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.
  • %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

[ Learn More ]
There may be some component files 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.
  • %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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