BKDR_ZEGOST.TPAK

May 15, 2014
 Modified by: RonJay Kristoffer Caragay
 ALIASES:

Backdoor:Win32/Zegost.BZ (Microsoft); Trojan.Win32.Redosdru.C (v) (Sunbelt); Trojan horse BackDoor.Generic_r.ESH (AVG)

 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:

  • 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:

266,345 bytes

File Type:

EXE

Initial Samples Received Date:

14 May 2014

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:

  • {malware path}\{random filename}
  • %All User Profile%\¡¸¿ªÊ¼¡¹²Ëµ¥\³ÌÐò\Æô¶¯\jing.exe
  • C:\Documents and Settings\All Users\Start Menu\Programs\Startup\jing.exe
  • C:\Users\Administrator\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\jing.exe

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
jing = "{malware path and file name}"

Other Details

This backdoor connects to the following possibly malicious URL:

  • {BLOCKED}13.{BLOCKED}p.cn