Modified by: Michelle Morales
ALIASES:

Spammer:Win32/Tedroo.AJ (Microsoft); Generic Dropper!1gf (McAfee); Trojan-Dropper.Win32.Injector.afsd (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.KDV.492383 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 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.

It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size: 135,664 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 06 Mar 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.

Other System Modifications

This Trojan adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Tcpip\Parameters
MaxUserPort = "fffe"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Tcpip\Parameters
TcpNumConnections = "fffe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\BITS
id = "{32 numbers}"

Backdoor Routine

This Trojan connects to the following websites to send and receive information:

  • {BLOCKED}ek2.com
  • sec.{BLOCKED}tgame.com

NOTES:

It monitors the following SMTP servers:

  • alt1.aspmx.l.google.com
  • alt2.aspmx.l.google.com
  • alt3.aspmx.l.google.com
  • alt4.aspmx.l.google.com
  • in-01.mx.aol.com
  • in-02.mx.aol.com
  • in-03.mx.aol.com
  • in-04.mx.aol.com
  • mailin-01.mx.aol.com
  • mailin-02.mx.aol.com
  • mailin-03.mx.aol.com
  • mailin-04.mx.aol.com
  • mx1.gmx.com
  • mx2.gmx.com
  • mx3.gmx.com
  • mx4.gmx.com
  • mx1.hotmail.com
  • mx2.hotmail.com
  • mx3.hotmail.com
  • mx4.hotmail.com
  • ns1.google.com
  • ns2.google.com
  • ns3.google.com
  • ns4.google.com
  • t1.aspmx.l.google.com
  • t2.aspmx.l.google.com
  • t3.aspmx.l.google.com
  • t4.aspmx.l.google.com
  • yf1.yahoo.com
  • yf2.yahoo.com
  • yf3.yahoo.com
  • yf4.yahoo.com

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.820.01
FIRST VSAPI PATTERN DATE: 06 Mar 2012
VSAPI OPR PATTERN File: 8.821.00
VSAPI OPR PATTERN Date: 07 Mar 2012

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

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\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
    • MaxUserPort = "fffe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
    • TcpNumConnections = "fffe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\BITS
    • id = "{32 numbers}"

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_TEDROO.SMB. 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.


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