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TROJ_ROFIN.C

May 12, 2015
 ALIASES:

Trojan:Win32/Rofin (Microsoft); Downloader (Symantec); Mal/Behav-031 (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Found Win32/DH{gRKBE14egQ82Cg} (AVG)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

233,565 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

12 May 2015

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.

Other System Modifications

This Trojan deletes the following files:

  • %System Root%/windows/ax01.da0
  • %System Root%/sxz/nnn.dat
  • %System Root%/sxz

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

It deletes the following folders:

  • %System Root%\sxz

(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\ZWebNds\Security

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\ZWebNds\Enum

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
services\ZWebNds

Dropping Routine

This Trojan drops the following files:

  • ndisweb_new.dat0
  • ndisweb_new.dat1
  • %System%\drivers\ZWebNds.sys
  • %System%\drivers\uniconfi.dat

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://log.{BLOCKED}g.com/wb/bsf/?mac=00-50-56-9f-29-0e
  • {BLOCKED}8.251.56

It deletes itself after execution.

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.750

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

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • ndisweb_new.dat0
  • ndisweb_new.dat1
  • %System%\drivers\ZWebNds.sys
  • %System%\drivers\uniconfi.dat

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_ROFIN.C. 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 4

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • %System Root%/windows/ax01.da0
  • %System Root%/sxz/nnn.dat
  • %System Root%/sxz

Step 5

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\ZWebNds
    • Security
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\ZWebNds
    • Enum
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services
    • ZWebNds


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