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TROJ_AVRECON.A

April 08, 2015
 Analysis by: Miguel Carlo Ang
 ALIASES:

Trojan.Win32.Yakes.kfna(Kaspersky);TrojanDropper:Win32/Evotob.A(Microsoft);Trojan.GenericKD.2268732(BitDefender)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan 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:

209,408 bytes

File Type:

EXE

Memory Resident:

Yes

Arrival Details

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

  • %Application Data%\Mozilla\svchoste.exe

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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 Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Generic Host Process = %Application Data%\Mozilla\svchoste.exe

Other System Modifications

This Trojan adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Extensions
*.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Extensions
*.dll = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Extensions
*.tmp = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
afwqs.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
rgjdu.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
explorer.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
spoolsv.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
rundll32.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
consent.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
svchost.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Extensions
*.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Extensions
*.dll = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Extensions
*.tmp = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
afwqs.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
rgjdu.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
explorer.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
spoolsv.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
rundll32.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
consent.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
svchost.exe = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion
wowsys64datecheck = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion
ZonesSecurityTestUpgrade = 1

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\publicprofile
EnableFirewall = 0

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\publicprofile
DoNotAllowExceptions = 0

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\publicprofile
DisableNotifications = 1

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile
DoNotAllowExceptions = 0

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile
DisableNotifications = 1

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DoNotAllowExceptions = 0

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = 1

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
EnableFirewall = 0

(Note: The default value data of the said registry entry is 1.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://up.{BLOCKED}nect.cc/common/up.php
  • http://{BLOCKED}onized2.cc/lost.dat