TROJ_SIREFEF.IU

October 13, 2012

ALIASES:

Trojan:Win32/Sirefef.V (Microsoft); ZeroAccess.aq (McAfee); Trojan.Gen (Symantec); Trojan.Win32.Diple.eklp, Trojan.Win32.Diple.eklp (Kaspersky); Trojan.Win32.Diple.eklp (v) (Sunbelt); Gen:Variant.Barys.629 (FSecure)

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.

It modifies files, disabling programs and applications from properly running.

TECHNICAL DETAILS

File Size:

942,080 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

13 Aug 2012

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\68AD0
%Program Files%\LP
%Program Files%\LP\2186
%User Profile%\Application Data\xg2dxlhfykiqo1fkgky3bbplqzu3qxg2

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /e"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /J"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /m"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /n"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /T"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /a"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /Z"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /l"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /P"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /j"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /N"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /Y"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /D"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /q"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /y"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /R"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /E"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /k"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /r"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /S"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /W"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /h"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /u"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /H"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /g"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /L"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /U"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /b"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /i"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /c"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /C"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /t"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /v"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /A"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /B"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /X"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /K"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /f"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /M"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /s"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /Q"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /G"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /x"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /F"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /d"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /V"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /I"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /z"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /O"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
piayoo = "%User Profile%\piayoo.exe /w"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
056.exe = "%Program Files%\LP\2186\056.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Windows Init = "%User Profile%\xg2dxlhfykiqo1fkgky3bbplqzu3qxg22\svcnost.exe"

It 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\.mrxsmb

Other System Modifications

This Trojan modifies the following files:

%System%\drivers\etc\hosts

(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

It deletes the following files:

%User Profile%\2eaj.exe
%System%\drivers\etc\hosts

It deletes the following folders:

%User Profile%\My Documents\My Pictures
%Start Menu%\Programs\Administrative Tools

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\WinRAR

HKEY_LOCAL_MACHINE\Software\Classes\
Interface\{58633341-5816-2bc7-2251-cb7edbdd0cf8}

HKEY_CURRENT_USER\Software\223f9631

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Internet Explorer\LowRegistry

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\WindowsUpdate\
AU
NoAutoUpdate = "1"

HKEY_CURRENT_USER\Software\WinRAR
HWID = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{58633341-5816-2bc7-2251-cb7edbdd0cf8}
u = "bc"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\.mrxsmb
Type = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\.mrxsmb
Start = "3"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\.mrxsmb
ImagePath = "\?"

HKEY_CURRENT_USER\Software\223f9631
u = "bc"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Profile%\xg2dxlhfykiqo1fkgky3bbplqzu3qxg22\svcnost.exe = "{random characters}"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\LowRegistry
SavedLegacySettingsML = "{random values}"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\wscsvc
Start = "3"

(Note: The default value data of the said registry entry is 2.)

Dropping Routine

This Trojan drops the following files:

%User Profile%\html.html
%Program Files%\LP\2186\2.tmp
%Program Files%\LP\2186\056.exe
%User Temp%\ieA643.tmp
U
L
ACPI#PNP0303#2&da1a3ff&0\L\enixkeeo
ACPI#PNP0303#2&da1a3ff&0\@
@
X
%Desktop%.ini
%User Profile%\Application Data\ntuser.dat

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.. %Program Files% is the default Program Files folder, usually C:\Program Files.. %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.. %Desktop% is the current user's desktop, which is usually C:\Windows\Profiles\{user name}\Desktop on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Desktop on Windows NT, and C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003.)

Other Details

This Trojan connects to the following possibly malicious URL:

http://com9.{BLOCKED}s.to/stream

This report is generated via an automated analysis system.

SOLUTION

Minimum Scan Engine:

9.200

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

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
- .mrxsmb

In HKEY_CURRENT_USER\Software
- WinRAR

In HKEY_LOCAL_MACHINE\Software\Classes\Interface
- {58633341-5816-2bc7-2251-cb7edbdd0cf8}

In HKEY_CURRENT_USER\Software
- 223f9631

In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer
- LowRegistry

Step 4

Delete this registry value

[ Learn More ]

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /e"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /J"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /m"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /n"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /T"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /a"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /Z"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /l"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /P"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /j"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /N"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /Y"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /D"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /q"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /y"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /R"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /E"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /k"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /r"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /S"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /W"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /h"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /u"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /H"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /g"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /L"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /U"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /b"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /i"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /c"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /C"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /t"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /v"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /A"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /B"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /X"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /K"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /f"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /M"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /s"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /Q"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /G"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /x"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /F"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /d"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /V"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /I"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /z"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /O"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- piayoo = "%User Profile%\piayoo.exe /w"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- 056.exe = "%Program Files%\LP\2186\056.exe"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Windows Init = "%User Profile%\xg2dxlhfykiqo1fkgky3bbplqzu3qxg22\svcnost.exe"

In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- ShowSuperHidden = "0"

In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU
- NoAutoUpdate = "1"

In HKEY_CURRENT_USER\Software\WinRAR
- HWID = "{random values}"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{58633341-5816-2bc7-2251-cb7edbdd0cf8}
- u = "bc"

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\.mrxsmb
- Type = "1"

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\.mrxsmb
- Start = "3"

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\.mrxsmb
- ImagePath = "\?"

In HKEY_CURRENT_USER\Software\223f9631
- u = "bc"

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- %User Profile%\xg2dxlhfykiqo1fkgky3bbplqzu3qxg22\svcnost.exe = "{random characters}"

In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\LowRegistry
- SavedLegacySettingsML = "{random values}"

To delete the registry value this malware/grayware created:

Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Run
In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /e"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /J"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /m"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /n"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /T"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /a"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /Z"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /l"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /P"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /j"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /N"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /Y"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /D"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /q"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /y"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /R"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /E"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /k"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /r"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /S"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /W"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /h"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /u"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /H"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /g"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /L"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /U"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /b"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /i"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /c"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /C"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /t"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /v"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /A"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /B"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /X"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /K"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /f"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /M"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /s"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /Q"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /G"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /x"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /F"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /d"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /V"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /I"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /z"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /O"
Again In the right panel, locate and delete the entry:
piayoo = "%User Profile%\piayoo.exe /w"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Run
In the right panel, locate and delete the entry:
056.exe = "%Program Files%\LP\2186\056.exe"
Again In the right panel, locate and delete the entry:
Windows Init = "%User Profile%\xg2dxlhfykiqo1fkgky3bbplqzu3qxg22\svcnost.exe"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Windows>CurrentVersion>Explorer>Advanced
In the right panel, locate and delete the entry:
ShowSuperHidden = "0"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Policies>Microsoft>Windows>WindowsUpdate>AU
In the right panel, locate and delete the entry:
NoAutoUpdate = "1"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>WinRAR
In the right panel, locate and delete the entry:
HWID = "{random values}"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Interface>{58633341-5816-2bc7-2251-cb7edbdd0cf8}
In the right panel, locate and delete the entry:
u = "bc"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>Services>.mrxsmb
In the right panel, locate and delete the entry:
Type = "1"
Again In the right panel, locate and delete the entry:
Start = "3"
Again In the right panel, locate and delete the entry:
ImagePath = "\?"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>223f9631
In the right panel, locate and delete the entry:
u = "bc"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SYSTEM>ControlSet001>Services>SharedAccess>Parameters>FirewallPolicy>StandardProfile>AuthorizedApplications>List
In the right panel, locate and delete the entry:
%User Profile%\xg2dxlhfykiqo1fkgky3bbplqzu3qxg22\svcnost.exe = "{random characters}"
In the left panel, double-click the following:
HKEY_CURRENT_USER>Software>Microsoft>Internet Explorer>LowRegistry
In the right panel, locate and delete the entry:
SavedLegacySettingsML = "{random values}"
Close Registry Editor.

Step 5

Restore this modified registry value

[ Learn More ]

In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\wscsvc
- From: Start = "3"
  To: Start = ""2""

Step 6

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.

%User Profile%\html.html
%Program Files%\LP\2186\2.tmp
%Program Files%\LP\2186\056.exe
%User Temp%\ieA643.tmp
U
L
ACPI#PNP0303#2&da1a3ff&0\L\enixkeeo
ACPI#PNP0303#2&da1a3ff&0\@
@
X
%Desktop%.ini
%User Profile%\Application Data\ntuser.dat

Step 7

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\68AD0
%Program Files%\LP
%Program Files%\LP\2186
%User Profile%\Application Data\xg2dxlhfykiqo1fkgky3bbplqzu3qxg2

Step 8

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

Step 9

Restore deleted/modified files and/or registry entries from backup

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

%System%\drivers\etc\hosts

Step 10

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.

%User Profile%\2eaj.exe
%System%\drivers\etc\hosts

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