Analysis by: David John Agni
ALIASES:

Infostealer.Dyranges (Symantec), PWS:Win32/Dyzap (Microsoft), Trojan.Win32.Staser.artq (Kaspersky)

 PLATFORM:

Windows

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

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This spyware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

Tamaño del archivo 384,512 bytes
Tipo de archivo EXE
Residente en memoria Yes
Fecha de recepción de las muestras iniciales 19 Dec 2014

Arrival Details

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

  • %Windows%\{Random Filename}.exe - (Windows XP)
  • %AppDataLocal%\{Random Filename}.exe - (Windows Vista and Higher)

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run - (For Windows Vista and Higher)
(Default) = "%AppDataLocal%\{Random Filename}.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\googleupdate - (For Windows XP)
DisplayName = Google Update Service

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\googleupdate - (For Windows XP)
ImagePath = "%Windows%\{Random Filename}.exe"

Other Details

This spyware connects to the following possibly malicious URL:

  • http://{BLOCKED}8.{BLOCKED}5.210.181:443
  • http://{BLOCKED}4.{BLOCKED}3.61.172:4443
  • http://{BLOCKED}4.{BLOCKED}3.195.148:4443
  • http://{BLOCKED}4.{BLOCKED}3.25.93:443
  • http://{BLOCKED}4.{BLOCKED}3.61.172:443
  • http://{BLOCKED}5.{BLOCKED}1.199.37:443
  • http://{BLOCKED}8.{BLOCKED}5.210.181:4443
  • http://{BLOCKED}4.{BLOCKED}.25.93:4443
  • http://{BLOCKED}5.{BLOCKED}1.199.37:4443
  • http://{BLOCKED}4.{BLOCKED}0.19.202:443
  • http://{BLOCKED}9.{BLOCKED}0.104.136:443
  • http://{BLOCKED}4.{BLOCKED}3.25.93:443

It deletes the initially executed copy of itself