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BKDR_SIMDA.USR

April 22, 2013
 Analysis by: Anthony Joe Melgarejo
 ALIASES:

BackDoor-FAMP!2A5BAB12C7A6 (McAfee), W32/Simda.B!tr (Fortinet), Backdoor.Win32.Simda.qjz (Kaspersky), Win32/Simda.B trojan (ESET), Win32/Simda.B trojan (VIPRE)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes commands from a remote malicious user, effectively compromising the affected system.

As of this writing, the said sites are inaccessible.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size:

656,384 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

18 Apr 2013

Payload:

Connects to URLs/IPs, Compromises system security, Downloads files

Arrival Details

This backdoor 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 backdoor drops the following files:

  • %Application Data%\{random name}.reg
  • %Application Data%\mcp.ico
  • %Desktop%\Computer.lnk
  • %User Temp%\{random name}.sys
  • %User Temp%\{random number}.tmp
  • %User Temp%\{random name}.exe

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It drops the following copies of itself into the affected system:

  • %Application Data%\ScanDisc.exe
  • %Application Data%\{random name}.exe
  • %User Temp%\{random number}.tmp

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
{random name} = "%Application Data%\{random name}.exe"

Other System Modifications

This backdoor adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
ConsentPromptBehaviorAdmin = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
ConsentPromptBehaviorUser = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
EnableLUA = "0"

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows
update = "shortcut"

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Download and execute arbitrary files
  • Remote shell

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • http://{BLOCKED}.{BLOCKED}.243.64/chrome/report.html
  • http://{BLOCKED}.{BLOCKED}.12.201
  • http://{BLOCKED}.{BLOCKED}.83.116
  • http://{BLOCKED}.{BLOCKED}.38.174
  • update.{pseudorandom}.com
  • report.{pseudorandom}.com

It posts the following information to its command and control (C&C) server:

  • OS information

Download Routine

This backdoor accesses the following websites to download files:

  • http://{BLOCKED}1.{BLOCKED}string.com/?controller=hash
  • http://{BLOCKED}1.{BLOCKED}string.com/?abbr=RTK&setupType=update&uid={random number}&ttl={random string}&controller=microinstaller&pid=3
  • http://{BLOCKED}1.{BLOCKED}string.com/update_c1eec.exe
  • http://{BLOCKED}1.{BLOCKED}main.com/?abbr=RTK&action=download&setupType=umx&setupFileName=process_64.exe

It saves the files it downloads using the following names:

  • %User Temp%\{random number}.exe
  • %System Root%\text.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

As of this writing, the said sites are inaccessible.

HOSTS File Modification

This backdoor modifies the system's HOSTS files to redirect users once the following Web site(s) are accessed:

  • www.google-analytics.com
  • ad-emea.doubleclick.net
  • www.statcounter.com

Other Details

This backdoor checks for the presence of the following process(es):

  • cv.exe
  • irise.exe
  • IrisSvc.exe
  • wireshark.exe
  • dumpcap.exe
  • ZxSniffer.exe
  • Aircrack-ng Gui.exe
  • observer.exe
  • tcpdump.exe
  • WinDump.exe
  • wspass.exe
  • Regshot.exe
  • ollydbg.exe
  • PEBrowseDbg.exe
  • windbg.exe
  • DrvLoader.exe
  • SymRecv.exe
  • Syser.exe
  • apis32.exe
  • VBoxService.exe
  • VBoxTray.exe
  • SbieSvc.exe
  • SbieCtrl.exe
  • SandboxieRpcSs.exe
  • SandboxieDcomLaunch.exe
  • SUPERAntiSpyware.exe
  • ERUNT.exe
  • ERDNT.exe
  • EtherD.exe
  • Sniffer.exe
  • CamtasiaStudio.exe
  • CamRecorder.exe

It deletes the initially executed copy of itself

NOTES:

It checks for the following registry entries:

  • Software\CommView
  • SYSTEM\CurrentControlSet\Services\IRIS5
  • Software\eEye Digital Security
  • Software\Microsoft\Windows\CurrentVersion\Uninstall\Wireshark
  • Software\Microsoft\Windows\CurrentVersion\App Paths\wireshark.exe
  • Software\ZxSniffer
  • Software\Cygwin
  • Software\B Labs\Bopup Observer
  • AppEvents\Schemes\Apps\Bopup Observer
  • Software\B Labs\Bopup Observer
  • Software\Microsoft\Windows\CurrentVersion\Uninstall\Win Sniffer_is1
  • Software\Win Sniffer
  • Software\Classes\PEBrowseDotNETProfiler.DotNETProfiler
  • Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start Menu2\Programs\Debugging Tools for Windows (x86)
  • SYSTEM\CurrentControlSet\Services\SDbgMsg
  • Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start Menu2\Programs\APIS32
  • Software\Syser Soft
  • Software\Microsoft\Windows\CurrentVersion\Uninstall\APIS32
  • Software\APIS32
  • Software\Microsoft\Windows\CurrentVersion\Uninstall\Oracle VM VirtualBox Guest Additions
  • SYSTEM\CurrentControlSet\Services\VBoxGuest
  • Software\Microsoft\Windows\CurrentVersion\Uninstall\Sandboxie
  • SYSTEM\CurrentControlSet\Services\SbieDrv
  • Software\Classes\Folder\shell\sandbox
  • Software\Classes\*\shell\sandbox
  • Software\SUPERAntiSpyware.com
  • Software\Classes\SUPERAntiSpywareContextMenuExt.SASCon.1
  • Software\SUPERAntiSpyware.com
  • Software\Microsoft\Windows\CurrentVersion\Uninstall\ERUNT_is1

If the said processes or registry entries are found, it will not continue to perform its intended routine.

The hosts file modification redirects the specified web sites to the following URL:

  • http://{BLOCKED}.{BLOCKED}.143.99

Here is the list of the domains and where they are redirected:

  • google.co.nz.={BLOCKED}.{BLOCKED}.87.103
  • www.google.co.nz.={BLOCKED}.{BLOCKED}.87.147
  • google.pl.={BLOCKED}.{BLOCKED}.87.103
  • www.google.pl.={BLOCKED}.{BLOCKED}.87.147
  • google.se.={BLOCKED}.{BLOCKED}.87.103
  • www.google.se.={BLOCKED}.{BLOCKED}.87.147
  • google.co.uk.={BLOCKED}.{BLOCKED}.87.103
  • www.google.co.uk.={BLOCKED}.{BLOCKED}.87.147
  • google.co.za.={BLOCKED}.{BLOCKED}.87.103
  • www.google.co.za.={BLOCKED}.{BLOCKED}.87.147
  • google.gr.={BLOCKED}.{BLOCKED}.87.103
  • www.google.gr.={BLOCKED}.{BLOCKED}.87.147
  • google.ro.={BLOCKED}.{BLOCKED}.87.103
  • www.google.ro.={BLOCKED}.{BLOCKED}.87.147
  • google.pt.={BLOCKED}.{BLOCKED}.87.103
  • www.google.pt.={BLOCKED}.{BLOCKED}.87.147
  • google.es.={BLOCKED}.{BLOCKED}.87.103
  • www.google.es.={BLOCKED}.{BLOCKED}.87.147
  • google.es.={BLOCKED}.{BLOCKED}.87.103
  • www.google.es.={BLOCKED}.{BLOCKED}.87.147
  • google.com.tr.={BLOCKED}.{BLOCKED}.87.103
  • www.google.com.tr.={BLOCKED}.{BLOCKED}.87.147
  • google.com.tr.={BLOCKED}.{BLOCKED}.87.103
  • www.google.com.tr.={BLOCKED}.{BLOCKED}.87.147
  • google.hu.={BLOCKED}.{BLOCKED}.87.103
  • www.google.hu.={BLOCKED}.{BLOCKED}.87.147
  • google.cz.={BLOCKED}.{BLOCKED}.87.103
  • www.google.cz.={BLOCKED}.{BLOCKED}.87.147
  • google.at.={BLOCKED}.{BLOCKED}.87.103
  • www.google.at.={BLOCKED}.{BLOCKED}.87.147
  • google.fi.={BLOCKED}.{BLOCKED}.87.103
  • www.google.fi.={BLOCKED}.{BLOCKED}.87.147
  • google.co.in.={BLOCKED}.{BLOCKED}.87.103
  • www.google.co.in.={BLOCKED}.{BLOCKED}.87.147
  • google.com.ar.={BLOCKED}.{BLOCKED}.87.103
  • www.google.com.ar.={BLOCKED}.{BLOCKED}.87.147
  • www.google.com.co.={BLOCKED}.{BLOCKED}.87.147
  • google.com.co.={BLOCKED}.{BLOCKED}.87.147
  • www.google.com.mx.={BLOCKED}.{BLOCKED}.87.147
  • google.com.mx.={BLOCKED}.{BLOCKED}.87.147
  • www.google.com.pe.={BLOCKED}.{BLOCKED}.87.147
  • google.com.pe.={BLOCKED}.{BLOCKED}.87.147
  • www.google.cl.={BLOCKED}.{BLOCKED}.87.147
  • google.cl.={BLOCKED}.{BLOCKED}.87.147
  • www.google.co.ve.={BLOCKED}.{BLOCKED}.87.147
  • google.co.ve.={BLOCKED}.{BLOCKED}.87.147
  • www.google.com.my.={BLOCKED}.{BLOCKED}.87.147
  • google.com.my.={BLOCKED}.{BLOCKED}.87.147
  • www.google.com.vn.={BLOCKED}.{BLOCKED}.87.147
  • google.com.vn.={BLOCKED}.{BLOCKED}.87.147
  • www.google.co.id.={BLOCKED}.{BLOCKED}.87.147
  • google.co.id.={BLOCKED}.{BLOCKED}.87.147
  • www.google.co.com.={BLOCKED}.{BLOCKED}.87.147
  • google.co.com.={BLOCKED}.{BLOCKED}.87.147
  • www.google.com.ph.={BLOCKED}.{BLOCKED}.87.147
  • google.com.ph.={BLOCKED}.{BLOCKED}.87.147
  • www.google.co.il.={BLOCKED}.{BLOCKED}.87.147
  • google.co.il.={BLOCKED}.{BLOCKED}.87.147
  • www.google.sk.={BLOCKED}.{BLOCKED}.87.147
  • google.sk.={BLOCKED}.{BLOCKED}.87.147
  • www.google.com.pr.={BLOCKED}.{BLOCKED}.87.147
  • google.com.pr.={BLOCKED}.{BLOCKED}.87.147
  • www.google.co.th.={BLOCKED}.{BLOCKED}.87.147
  • google.co.th.={BLOCKED}.{BLOCKED}.87.147
  • www.google.ba.={BLOCKED}.{BLOCKED}.87.147
  • google.ba.={BLOCKED}.{BLOCKED}.87.147
  • www.google.lt.={BLOCKED}.{BLOCKED}.87.147
  • google.lt.={BLOCKED}.{BLOCKED}.87.147
  • www.google.com.sa.={BLOCKED}.{BLOCKED}.87.147
  • google.com.sa.={BLOCKED}.{BLOCKED}.87.147
  • www.google.rs.={BLOCKED}.{BLOCKED}.87.147
  • google.rs.={BLOCKED}.{BLOCKED}.87.147
  • www.google.hr.={BLOCKED}.{BLOCKED}.87.147
  • google.hr.={BLOCKED}.{BLOCKED}.87.147
  • www.google.com.sg.={BLOCKED}.{BLOCKED}.87.147
  • google.com.sg.={BLOCKED}.{BLOCKED}.87.147
  • www.google.bg.={BLOCKED}.{BLOCKED}.87.147
  • google.bg.={BLOCKED}.{BLOCKED}.87.147
  • www.google.si.={BLOCKED}.{BLOCKED}.87.147
  • google.si.={BLOCKED}.{BLOCKED}.87.147
  • www.google.ae.={BLOCKED}.{BLOCKED}.87.147
  • google.ae.={BLOCKED}.{BLOCKED}.87.147
  • www.google.ee.={BLOCKED}.{BLOCKED}.87.147
  • google.ee.={BLOCKED}.{BLOCKED}.87.147
  • www.google.com.ec.={BLOCKED}.{BLOCKED}.87.147
  • google.com.ec.={BLOCKED}.{BLOCKED}.87.147
  • www.google.com.za.={BLOCKED}.{BLOCKED}.87.147
  • google.com.za.={BLOCKED}.{BLOCKED}.87.147
  • www.google.sn.={BLOCKED}.{BLOCKED}.87.147
  • google.sn.={BLOCKED}.{BLOCKED}.87.147
  • www.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • bing.com.={BLOCKED}.{BLOCKED}.68.97
  • gr.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • ir.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • gb.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • dk.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • au.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • ro.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • ca.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • pt.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • it.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • de.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • es.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • tr.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • hu.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • br.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • cz.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • ie.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • ch.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • nl.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • se.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • no.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • at.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • fi.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • fr.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • pl.bing.com.={BLOCKED}.{BLOCKED}.68.97
  • search.yahoo.com.={BLOCKED}.{BLOCKED}.186.249
  • www.search.yahoo.com.={BLOCKED}.{BLOCKED}.186.249
  • gr.uk.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • ir.uk.search.yahoo.com.={BLOCKED}.{BLOCKED}.239.84
  • uk.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • dk.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • au.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • ro.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • ca.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • pt.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • it.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • de.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • es.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • tr.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • hu.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • br.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • cz.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • ie.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • ch.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • nl.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • se.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • no.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • fr.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • pl.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • mx.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • search.yahoo.co.jp.={BLOCKED}.{BLOCKED}.112.8
  • gr.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • malaysia.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • vn.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • cl.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • id.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • in.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • co.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • ph.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • nz.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • ve.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • ar.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • fi.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • th.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • sg.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • ch.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • at.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • za.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • cn.search.yahoo.com.={BLOCKED}.{BLOCKED}.112.8
  • www.google-analytics.com.={BLOCKED}.{BLOCKED}.87.101
  • google-analytics.com.={BLOCKED}.{BLOCKED}.87.101
  • ad-emea.doubleclick.net.={BLOCKED}.{BLOCKED}.87.101
  • www.statcounter.com.={BLOCKED}.{BLOCKED}.87.101
  • www.google-analytics.com.={BLOCKED}.{BLOCKED}.87.101
  • ad-emea.doubleclick.net.={BLOCKED}.{BLOCKED}.87.101
  • www.statcounter.com.={BLOCKED}{BLOCKED}.87.101

It also redirects to the following URL when the user attemps to search using the domains specified in the list:

  • http://{BLOCKED}la.com/?&uid=%d&q={searchTerms}

It also attempts to open the file %System Root%\cgvi5r6i\vgdgfd.72g.

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.866.04

FIRST VSAPI PATTERN DATE:

19 Apr 2013

VSAPI OPR PATTERN File:

9.867.00

VSAPI OPR PATTERN Date:

19 Apr 2013

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

Scan your computer with your Trend Micro product and note files detected as BKDR_SIMDA.USR

Step 3

Restart in Safe Mode

[ Learn More ]

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
    • {random name} = "%Application Data%\{random name}.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
    • ConsentPromptBehaviorAdmin = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
    • ConsentPromptBehaviorUser = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
    • EnableLUA = "0"
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows
    • update = "shortcut"

Step 5

Search and delete the file detected as BKDR_SIMDA.USR

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files in the search result.

Step 6

Search and delete these files

[ Learn More ]
There may be some 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.
  • %Application Data%\{random name}.reg
  • %Application Data%\mcp.ico
  • %Desktop%\Computer.lnk
  • %User Temp%\{random name}.sys
  • %User Temp%\{random number}.tmp
  • %User Temp%\{random name}.exe
  • %User Temp%\{random number}.exe
  • %System Root%\text.exe

Step 7

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