Analysis by: Michael Cabel
 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

Infection Channel: Dropped by other malware

This Trojan may be dropped by other malware.

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size: 19,968 bytes
File Type: DLL
Memory Resident: No
Initial Samples Received Date: 06 Sep 2012
Payload: Drops files

Arrival Details

This Trojan may be dropped by the following malware:

  • TROJ_ARTIEF.EXA

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
conime.exe = "%Windows%\tasks\conime.exe"

Dropping Routine

This Trojan drops the following files:

  • %Windows%\Tasks\conime.exe - detected as TROJ_AGENT.EXA

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 9.372.04
FIRST VSAPI PATTERN DATE: 06 Sep 2012
VSAPI OPR PATTERN File: 9.373.00
VSAPI OPR PATTERN Date: 06 Sep 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

Remove malware files dropped/downloaded by TROJ_SISRON.EXA

    TROJ_AGENT.EXA

Step 3

Remove malware/grayware files that dropped/downloaded TROJ_SISRON.EXA

    TROJ_ARTIEF.EXA

Step 4

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
    • conime.exe = "%Windows%\tasks\conime.exe"

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_SISRON.EXA. 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 6

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.

RESTORE
  • Close Registry Editor.


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