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Threat Encyclopedia

BKDR_EVILOGE.SM


ALIASES:

W32/Wmonder.A!tr (Fortinet),

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:
INFORMATION EXPOSURE:

  • Threat Type:Backdoor

  • Destructiveness:No

  • Encrypted: Yes

  • In the wild: Yes

OVERVIEW

Infection Channel:

Dropped by other malware


This malware was used in the EvilGrab campaign, which targets victims in Japan and China.

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. It connects to a website to send and receive information.

It retrieves specific information from the affected system.

It deletes the initially executed copy of itself.

TECHNICAL DETAILS

File Size:

Varies

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

02 Aug 2013

Payload:

Steals information, Terminates processes, Collects system information

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 copies of itself into the affected system:

  • %Application Data%\360\Live360.exe
  • %Application Data%\temp\temp1.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.)

It adds the following processes:

  • svchost.exe

It creates the following folders:

  • %Application Data%\360
  • %Application Data%\temp

(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.)

It stays memory-resident by injecting codes into the following processes:

  • svchost.exe

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\Run
UKey = "%Application Data%\360\Live360.exe"

Other System Modifications

This backdoor adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\rar

HKEY_CURRENT_USER\Software\rar

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\rar
data = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\rar
s = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\rar
ActiveSettings = "{random characters}"

Backdoor Routine

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

  • Log keystrokes
  • Download and execute file(s)
  • Manipulate files
  • Manipulate directories
  • Steals user credentials such as user name and passwords, which are related to the following applications:
    • Internet Explorer Password-Protected sites
    • Microsoft Outlook
    • HTTP
    • IMAP
    • Protected Storage
    • POP3
    • SMTP
    • HTTPMail
    • Windows Messaging

It connects to the following websites to send and receive information:

  • http://www.{BLOCKED}k.hk

Process Termination

This backdoor terminates processes or services that contain any of the following strings if found running in the affected system's memory:

  • 360Safe
  • 360safe.exe
  • 360sd.exe
  • 360tray.exe
  • AVGIDSMonitor.exe
  • Avast
  • FProt
  • FProtTray.exe
  • FrzState2K.exe
  • KAVsvc.exe
  • KSafeTray.exe
  • KVwsc.exe
  • LiveUpdate360
  • MPMon.exe
  • Mcafee
  • Mcshield.exe
  • NOD32
  • RavMon.exe
  • RavMonD.exe
  • RsTray.exe
  • SfCtlCom.exe
  • UfNavi.exe
  • UfSeAgnt.exe
  • WinMe
  • ZhuDongFangYu.exe
  • ashServ.exe
  • avgrsx.exe
  • avp.exe
  • ccSvcHst.exe
  • ekrn.exe
  • explorer.exe
  • kav.exe
  • kwstray.exe
  • kxetray
  • nod32krn.exe
  • nscsrvce.exe
  • ravtask.exe
  • rising.exe
  • rtvscan.exe
  • ESET Filter Service
  • ESET5

Dropping Routine

This backdoor drops the following file(s), which it uses for its keylogging routine:

  • %User Profile%\users.bin - Contains keystroke logs

(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.)

Information Theft

This backdoor retrieves the following information from the affected system:

  • Local IP address
  • Operating system
  • Computer name
  • User name
  • Processor information

Other Details

This backdoor deletes the initially executed copy of itself

NOTES:

It decrypts two .DLL files in memory which it injects to its created instance of svchost.exe.

It attempts to steal all memory related to Tencent QQ, a Chinese instant messaging application. This includes conversations of the user's contacts in QQ.

SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.192.06

FIRST VSAPI PATTERN DATE:

02 Aug 2013

VSAPI OPR PATTERN File:

10.193.00

VSAPI OPR PATTERN Date:

03 Aug 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

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_CURRENT_USER\Software
    • rar
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • rar

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\Run
    • UKey = "%Application Data%\360\Live360.exe"

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.
  • %Application Data%\360
  • %Application Data%\temp

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.
  • %User Profile%\users.bin

Step 7

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