ALIASES:

Worm:Win32/Ainslot.A (Microsoft); Generic BackDoor.aaj (McAfee); Trojan.Gen (Symantec); Trojan.Win32.Jorik.Shakblades.hhe (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • 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

Tamaño del archivo 216,064 bytes
Tipo de archivo EXE
Residente en memoria Yes
Fecha de recepción de las muestras iniciales 12 Dec 2012

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.

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
Windows Defender = "%User Profile%\Application Data\T0NOLRQ1DJ.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Windows Defender = "%User Profile%\Application Data\T0NOLRQ1DJ.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{B731FFEE-1EB6-4DAD-D2D5-EEAA2F6BFFCF}
StubPath = "%User Profile%\Application Data\T0NOLRQ1DJ.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Active Setup\Installed Components\{B731FFEE-1EB6-4DAD-D2D5-EEAA2F6BFFCF}
StubPath = "%User Profile%\Application Data\T0NOLRQ1DJ.exe"

Other System Modifications

This Trojan deletes the following files:

  • zbciAdrxA3QNW4iNmgS

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\run

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{B731FFEE-1EB6-4DAD-D2D5-EEAA2F6BFFCF}

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Active Setup\Installed Components\{B731FFEE-1EB6-4DAD-D2D5-EEAA2F6BFFCF}

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
SrvID\ID

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\run
Windows Defender = "%User Profile%\Application Data\T0NOLRQ1DJ.exe"

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
SrvID\ID
SIYQ8SU0GX = "niko777's Bot"

This report is generated via an automated analysis system.

  SOLUTION

Motor de exploración mínimo 9.300

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry key

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer
    • run
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components
    • {B731FFEE-1EB6-4DAD-D2D5-EEAA2F6BFFCF}
  • In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Active Setup\Installed Components
    • {B731FFEE-1EB6-4DAD-D2D5-EEAA2F6BFFCF}
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\SrvID
    • ID

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • Windows Defender = "%User Profile%\Application Data\T0NOLRQ1DJ.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Windows Defender = "%User Profile%\Application Data\T0NOLRQ1DJ.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{B731FFEE-1EB6-4DAD-D2D5-EEAA2F6BFFCF}
    • StubPath = "%User Profile%\Application Data\T0NOLRQ1DJ.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Active Setup\Installed Components\{B731FFEE-1EB6-4DAD-D2D5-EEAA2F6BFFCF}
    • StubPath = "%User Profile%\Application Data\T0NOLRQ1DJ.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run
    • Windows Defender = "%User Profile%\Application Data\T0NOLRQ1DJ.exe"
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\SrvID\ID
    • SIYQ8SU0GX = "niko777's Bot"

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DROPPER.WKL. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

Step 6

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • zbciAdrxA3QNW4iNmgS


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