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TROJ_MEGAD

July 22, 2013
 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: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Spammed via email

MEGAD is also known as the Mega-D botnet or Ozdok. This botnet is responsible for sending spammed messages related to ads on male enhancement pills and replica watches.

  TECHNICAL DETAILS

Memory Resident:

Yes

Payload:

Sends spammed messages, Connects to URLs/IPs

Installation

This Trojan drops the following copies of itself into the affected system:

  • %System%:svchost.exe
  • %System%\icf.exe
  • %System%\svchost.exe:exe.exe
  • %System%\svchost.exe:ext.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It drops the following non-malicious file:

  • {malware path}\{random}.bat

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\ICF
Type = "110"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ICF
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ICF
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ICF
ImagePath = "%System%:svchost.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ICF
ImagePath = "%System%\svchost.exe:exe.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ICF
ImagePath = "%System%\svchost.exe:ext.exe"

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

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ICF
Group = "TDI"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ICF
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ICF\Security
Security = "{hex values}"

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
icf = "%System%\icf.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
icf = "%System%\icf.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\ICF

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ICF\Security

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}e.info
  • {BLOCKED}a.info
  • {BLOCKED}q.biz
  • {BLOCKED}nloxajz.com
  • {BLOCKED}hazz.com
  • {BLOCKED}dk.0rg
  • {BLOCKED}ndream.org
  • {BLOCKED}ebird.biz
  • {BLOCKED}airnv.biz
  • {BLOCKED}smotors.gs
  • {BLOCKED}ster.neustar
  • {BLOCKED}kalar.info
  • {BLOCKED}dream.info
  • {BLOCKED}razania.net
  • {BLOCKED}kianfuker.com
  • {BLOCKED}zorada.biz
  • {BLOCKED}ttikrak.info
  • {BLOCKED}juq.biz
  • {BLOCKED}rkazana.biz
  • {BLOCKED}yachts.cn
  • {BLOCKED}nora.com
  • {BLOCKED}sa.com
  • {BLOCKED}ngty.info
  • www.{BLOCKED}it.info
  • {BLOCKED}eam.info