TROJ_MICROLOG.A

Malware type: Trojan

Aliases: Trojan-Spy.Win32.MicroLog (Kaspersky), Keylog-IllLog (McAfee), Trojan Horse (Symantec), TR/Inor.B.1 (Avira), Troj/Ksniff-B (Sophos), MonitoringTool:Win32/IllLogger (Microsoft)

In the wild: No

Destructive: No

Language: English

Platform: Windows 95, 98, ME, NT, 2000, XP

Encrypted: No

Overall risk rating:

Reported infections:

Damage potential:

Medium

Distribution potential:

Low

Description: 

This memory-resident, non-encrypted Trojan keylogger resides on affected systems as the file MicroLog.exe. It records keystrokes and saves them in a file with the name "5.14.ill". It also modifies the registry so that it automatically executes during Windows startup.

This Trojan, despite its capability to log keystrokes, does not send out the key logs. Neither does it provide means for a malicious user to access the infected machine and obtains the logs.

This Trojan runs on Windows 95, 98, ME, NT, 2000, and XP.

For additional information about this threat, see:

Description created: Apr. 1, 2003 8:23:16 AM GMT -0800
Description updated: Apr. 1, 2003 8:41:12 AM GMT -0800


TECHNICAL DETAILS


Size of malware: 2,208 Bytes

Initial samples received on: Apr 20, 2002

Details:

Installation

Upon execution, this memory-resident, FSG-compiled (compressed) Trojan keylogger drops a copy of itself in the Windows folder as MicroLog.exe.

It then creates the following registry entry so that it automatically executes at Windows startup:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
CurrentVersion\Run
SystemBackUp = "MicroLog.exe"

Password Stealing Routine

This Trojan creates a folder named �logs� in the Windows folder and creates a file named "5.14.ill" in the created folder. It intercepts and records keystrokes and saves them into the file.

This Trojan, despite its capability to log keystrokes, does not send the key logs to a remote malicious user. It also does not provide means for a malicious user to access the infected machine and obtains the logs. These logs can only be obtained from the system manually.


SOLUTION


Minimum scan engine version needed: 5.200

Pattern file needed: 1.273.00

Pattern release date: Apr 20, 2002


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:

Identifying the Malware Program

Before proceeding to remove this malware, first identify the malware program.

Scan your system with Trend Micro antivirus and NOTE all files detected as TROJ_MICROLOG.A. To do this, Trend Micro customers must download the latest pattern file and scan their system. Other Internet users can use HouseCall, Trend Micro's free online virus scanner.

Terminating the Malware Program

This procedure terminates the running malware process from memory. You will need the name(s) of the file(s) detected earlier.

  1. Open Windows Task Manager.
    On Windows 9x/ME systems, press
    CTRL%20ALT%20DELETE
    On Windows NT/2000/XP systems, press
    CTRL%20SHIFT%20ESC, and click the Processes tab.
  2. In the list of running programs*, locate the malware file or files detected earlier.
  3. Select one of the detected files, then press either the End Task or the End Process button, depending on the version of Windows on your system.
  4. Do the same for all detected malware files in the list of running processes.
  5. To check if the malware process has been terminated, close Task Manager, and then open it again.
  6. Close Task Manager.

*NOTE: On systems running Windows 9x/ME, Task Manager may not show certain processes. You may use a third party process viewer to terminate the malware process. Otherwise, continue with the next procedure, noting additional instructions.

Removing Autostart Entries from the Registry

Removing autostart entries from the registry prevents the malware from executing during startup.

  1. Open Registry Editor. To do this, click Start>Run, type REGEDIT, then press Enter.
  2. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>Windows>
    CurrentVersion>Run
  3. In the right panel, locate and delete the entry:
    SystemBackUp = "MicroLog.exe"
  4. Close Registry Editor.
NOTE: If you were not able to terminate the malware process from memory, as described in the previous procedure, restart your system.

Deleting Malware Folder

Delete the �logs� folder from the Windows directory, which is usually the following:

  • C:\Windows (Windows 95, 98, ME, XP)
  • C:\WINNT (Windows NT, 2000)

Additional Windows ME/XP Cleaning Instructions

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete all files detected as TROJ_MICROLOG.A. To do this, Trend Micro customers must download the latest pattern file and scan their system. Other Internet users can use HouseCall, Trend Micro's free online virus scanner.


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