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TROJ_ROVNIX.YPPD

January 20, 2016
 Analysis by: Sammy Chua
 ALIASES:

TrojanDownloader:Win32/Rovnix.A (Microsoft); Trojan.Cidox.E (Symantec); Trojan-Spy.Win32.Carberp.apzc (Kaspersky);

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan may arrive bundled with malware packages as a malware component. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It deletes files in certain folders, disabling programs and applications from properly running.

  TECHNICAL DETAILS

File Size:

78,848 bytes

File Type:

DLL

Memory Resident:

Yes

Initial Samples Received Date:

13 Jan 2016

Arrival Details

This Trojan may arrive bundled with malware packages as a malware component.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other System Modifications

This Trojan deletes files in the following folders:

  • %User Temp%

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}nk2.com/download/{random hex}.zip
  • {BLOCKED}nk2.com/images/logout.gif
  • {BLOCKED}nk2.com/account.asp
  • {BLOCKED}nk2.com/images/{random number}.gif

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.270.04

FIRST VSAPI PATTERN DATE:

13 Jan 2016

VSAPI OPR PATTERN File:

12.271.00

VSAPI OPR PATTERN Date:

14 Jan 2016

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_ROVNIX.YPPD. 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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