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TROJ_CIDOX.WCW

July 02, 2014
 Analysis by: Odessy Silva
 ALIASES:

TrojanDropper:Win32/Rovnix (Microsoft), Trojan.Win32.Cidox.akxs (Kaspersky)

 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:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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.

As of this writing, the said sites are inaccessible.

It restarts the affected system. It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

151,552 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

10 Jun 2014

Payload:

Connects to URLs/IPs, Downloads files

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.

File Infection

This Trojan adds the following registry entries that act as infection markers:

HKEY_LOCAL_MACHINE\Software\Classes\
CLSID\{CLSID}

Download Routine

This Trojan connects to the following URL(s) to download its component file(s):

  • http://{BLOCKED}g-serilg.su

As of this writing, the said sites are inaccessible.

Other Details

This Trojan restarts the affected system.

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.854.06

FIRST VSAPI PATTERN DATE:

10 Jun 2014

VSAPI OPR PATTERN File:

10.855.00

VSAPI OPR PATTERN Date:

10 Jun 2014

Scan your computer with your Trend Micro product to delete files detected as TROJ_CIDOX.WCW. 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.

NOTES:
It modifies the NTFS boot sector to load its encrypted code.


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