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TROJ_COSMU.SMP

June 20, 2013
 ALIASES:

PWS:Win32/Ldpinch.BQ (Microsoft); W32/Sural.a (McAfee); W32.Spybot.Worm (Symantec); Trojan.Win32.Cosmu.so (Kaspersky); Trojan.Win32.Cosmu.so (v) (Sunbelt); Gen:Win32.SMTP-MassMailer.xJZ@aCDKuCc (FSecure)

 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

File Size:

3,527,282 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

10 Jul 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.

Installation

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

  • %System%\sychost.exe
  • 0769926821.exe
  • %Desktop%\WinPcap_4_1_2.exe
  • %Program Files%\Common Files\Microsoft Shared\MSInfo\msinfo32.exe
  • %Program Files%\Common Files\Microsoft Shared\Speech\sapisvr.exe
  • %Program Files%\Internet Explorer\Connection Wizard\icwconn1.exe
  • %Program Files%\Internet Explorer\Connection Wizard\icwconn2.exe
  • %Program Files%\Internet Explorer\Connection Wizard\icwrmind.exe
  • %Program Files%\Internet Explorer\Connection Wizard\icwtutor.exe
  • %Program Files%\Internet Explorer\Connection Wizard\inetwiz.exe
  • %Program Files%\Internet Explorer\Connection Wizard\isignup.exe
  • %Program Files%\Internet Explorer\iedw.exe
  • %Program Files%\Internet Explorer\IEXPLORE.EXE
  • %Program Files%\Movie Maker\moviemk.exe
  • %Program Files%\MSN\MSNCoreFiles\Install\MSN9Components\Digcore.exe
  • %Program Files%\MSN\MSNCoreFiles\Install\MSN9Components\Msncli.exe
  • %Program Files%\MSN\MSNCoreFiles\Install\msnsusii.exe
  • %Program Files%\MSN Gaming Zone\Windows\bckgzm.exe
  • %Program Files%\MSN Gaming Zone\Windows\chkrzm.exe
  • %Program Files%\MSN Gaming Zone\Windows\hrtzzm.exe
  • %Program Files%\MSN Gaming Zone\Windows\Rvsezm.exe
  • %Program Files%\MSN Gaming Zone\Windows\shvlzm.exe
  • %Program Files%\MSN Gaming Zone\Windows\zClientm.exe
  • %Program Files%\NetMeeting\cb32.exe
  • %Program Files%\NetMeeting\conf.exe
  • %Program Files%\NetMeeting\wb32.exe
  • %Program Files%\Outlook Express\msimn.exe
  • %Program Files%\Outlook Express\oemig50.exe
  • %Program Files%\Outlook Express\setup50.exe
  • %Program Files%\Outlook Express\wab.exe
  • %Program Files%\Outlook Express\wabmig.exe
  • %Program Files%\Windows Media Player\migrate.exe
  • %Program Files%\Windows Media Player\mplayer2.exe
  • %Program Files%\Windows Media Player\setup_wm.exe
  • %Program Files%\Windows Media Player\wmplayer.exe
  • %Program Files%\Windows NT\Accessories\wordpad.exe
  • %Program Files%\Windows NT\dialer.exe
  • %Program Files%\Windows NT\hypertrm.exe
  • %Program Files%\Windows NT\Pinball\PINBALL.EXE
  • %Program Files%\WinPcap\rpcapd.exe
  • %Program Files%\WinPcap\Uninstall.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Other System Modifications

This Trojan deletes the following files:

  • 0769926821.exe

Dropping Routine

This Trojan drops the following files:

  • %System Root%\TEMP\7123994589.exe
  • %System Root%\log.txt

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://megalife.{BLOCKED}st.by/bot.zip

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %System Root%\TEMP\7123994589.exe
  • %System Root%\log.txt

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_COSMU.SMP. 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 4

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.

  • 0769926821.exe


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