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TROJ_INJECT.LEX

October 09, 2012
 Analysis by: Erika Bianca Mendoza
 Modified by: Kathleen Notario
 ALIASES:

Trojan.Gen.2 (Symantec); Generic.grp!fk (Mcafee); W32/Inject.CMNW!tr (Fortinet)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This Trojan injects codes into its created process, svchost.exe. It attempts to send spammed emails received from remote sites using certain servers.

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

16,384 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

12 Jan 2012

Arrival Details

This Trojan may be unknowingly downloaded by a user while visiting malicious websites.

Installation

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

  • %User Profile%\p60c359rok.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

It adds the following processes:

  • svchost.exe

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • p60c359rok

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
p60c359rok = "%User Profile%\p60c359rok.exe"

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
p60c359rok = "{hex values}"

Other Details

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

  • {BLOCKED}.{BLOCKED}.180.170
  • {BLOCKED}.{BLOCKED}.180.171
  • {BLOCKED}.{BLOCKED}.180.172
  • {BLOCKED}.{BLOCKED}.181.242
  • {BLOCKED}.{BLOCKED}.181.243
  • {BLOCKED}.{BLOCKED}.181.244
  • {BLOCKED}.{BLOCKED}.227.32
  • {BLOCKED}.{BLOCKED}.227.33
  • {BLOCKED}.{BLOCKED}.227.34
  • {BLOCKED}rt.in
  • abc.{BLOCKED}rt.in
  • {BLOCKED}an.com
  • www.{BLOCKED}n.com
  • mail.{BLOCKED}n.com
  • mx.{BLOCKED}n.com
  • {BLOCKED}.{BLOCKED}.227.32

NOTES:

It injects codes into its created process, svchost.exe. It attempts to send spammed emails received from above mentioned remote sites using the following servers:

  • alt4.gmail-smtp-in.l.google.com
  • gmail-smtp-in.l.google.com
  • in1.smtp.messagingengine.com
  • mail7.digitalwaves.co.nz
  • mxs.mail.ru

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.704.03

FIRST VSAPI PATTERN DATE:

12 Jan 2012

VSAPI OPR PATTERN File:

8.705.00

VSAPI OPR PATTERN Date:

13 Jan 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Restart in Safe Mode

[ Learn More ]

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • p60c359rok = "%User Profile%\p60c359rok.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
    • p60c359rok = "{hex values}"

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_INJECT.LEX. 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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