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TSPY_DYRE.AATZ

December 20, 2014
 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

File Size:

384,512 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

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