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TROJ_KELIHOS.USR

April 19, 2013
 Analysis by: Anthony Joe Melgarejo
 ALIASES:

TrojanDownloader:Win32/Waledac.R (Microsoft), Troj/Zbot-EQP (Sophos), Win32/Kryptik.AYZB trojan (ESET)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  TECHNICAL DETAILS

File Size:

32,256 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

18 Apr 2013

Payload:

Downloads files

Arrival Details

This Trojan may be unknowingly downloaded by a user while visiting the following malicious websites:

  • http://{BLOCKED}.{BLOCKED}.123.44/news.html

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}eg.ru/newbos3.exe

It saves the files it downloads using the following names:

  • %Windows%\Temp\temp{number}.exe - detected as WORM_KELIHOS.USR

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

  SOLUTION

Minimum Scan Engine:

9.300

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

Remove malware/grayware files dropped/downloaded by TROJ_KELIHOS.USR

    • WORM_KELIHOS.USR

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_KELIHOS.USR. 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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