TROJ_AGENT.CZC

Malware type: Trojan

Aliases: New Malware.bx !! (McAfee), Downloader (Symantec), TR/Crypt.ULPM.Gen (Avira), Mal/Emogen-G (Sophos), TrojanDownloader:Win32/Fomish (Microsoft)

In the wild: Yes

Destructive: No

Language: English

Platform: Windows 98, ME, NT, 2000, XP, Server 2003

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

Low

Distribution potential:

Low

Description: 

A Trojan horse program is a malware that is not capable of automatically spreading to other systems. Trojans are usually downloaded from the Internet and installed by unsuspecting users.

Trojans typically carry payloads or other malicious actions that can range from the mildly annoying to the irreparably destructive. They may also modify system settings to automatically start. Restoring affected systems may require procedures other than scanning with an antivirus program.

For additional information about this threat, see:

TECHNICAL DETAILS


File type: PE

Memory resident:  No

Size of malware: 39,936 Bytes

Initial samples received on: Jan 17, 2008

Details:

Autostart Techniques

This Trojan creates the following registry entry(ies) to enable its automatic execution at every system startup:

HKEY_CLASSES_ROOT\WR
cmd = "

HKEY_CLASSES_ROOT\WR
nextupdate = "47853421"

HKEY_CLASSES_ROOT\WR
version = "53"

HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\Windows\CURRENTVERSION\
Run
runner1 = "%Windows%\mrofinu.exe "

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\
Run
runner1 = "%Windows%\mrofinu.exe"

Affected Platforms

This Trojan runs on Windows 98, ME, NT, 2000, XP, Server 2003.


Revision History:

First pattern file version: 5.572.06
First pattern file release date: Sep 30, 2008

SOLUTION


Minimum scan engine version needed: 8.300

Pattern file needed: 5.573.00

Pattern release date: Sep 30, 2008


Important note: The "Minimum scan engine" refers to the earliest Trend Micro scan engine version guaranteed to detect this threat. However, Trend Micro strongly recommends that you update to the latest version in order to get comprehensive protection. Download the latest scan engine here.

Solution:

Removing Autostart Entries from the Registry

This solution deletes/modifies registry keys/entries added/modified by this malware. Before performing the steps below, make sure you know how to back up the registry and how to restore it if a problem occurs. Refer to this Microsoft article for more information about modifying your computer's registry.

  1. Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
  2. In the left panel, double-click the following:
    HKEY_CLASSES_ROOT>WR
  3. In the right panel, locate and delete the entry:
    • cmd = "
    • nextupdate = "47853421"
    • version = "53"
  4. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>Windows>CurrentVersion>
    Run
  5. In the right panel, locate and delete the entry:
    • runner1 = "%Windows%\mrofinu.exe "
    • runner1 = "%Windows%\mrofinu.exe"
  6. Close Registry Editor.

Important Windows ME/XP Cleaning Instructions

Users running Windows ME and XP must disable System Restore to allow full scanning of infected computers.

Users running other Windows versions can proceed with the succeeding solution set(s).

Running Trend Micro Antivirus

If you are currently running in safe mode, please restart your computer normally before performing the following solution.

Scan your computer with Trend Micro antivirus and delete files detected as TROJ_AGENT.CZC. To do this, Trend Micro customers must download the latest virus pattern file and scan their computer. Other Internet users can use HouseCall, the Trend Micro online virus scanner.




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