Analysis by: John Karlo Agon
ALIASES:

Backdoor.Win32.SdBot.epw (Kaspersky), W32/Sdbot.worm (McAfee), Worm:Win32/Pushbot.FO (Microsoft), Backdoor.Sdbot (Symantec), Agent.WRH (AVG)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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.

  TECHNICAL DETAILS

File Size: 36,586 bytes
File Type: EXE
Initial Samples Received Date: 24 Jul 2015

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:

  • %Windows%\msavc32.exe

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

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Microsoft Anti Virus Controller = msavc32.exe

Other Details

This backdoor connects to the following possibly malicious URL:

  • www.{BLOCKED}s.com