WORM_WINIGA.AFK

May 06, 2015
 Analysis by: Rika Joi Gregorio
 ALIASES:

Virus:Win32/Capsfin.A(Microsoft), W32.Winiga(Norton), W32/Comrerop.AX!tr(Fortinet), Win32/Comrerop.C trojan(Eset)

 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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

  TECHNICAL DETAILS

File Size:

1,245,184 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

18 Nov 2014

Payload:

Connects to URLs/IPs, Steals information

Arrival Details

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

Installation

This worm drops the following files:

  • %System Root%\Winis7\Data\sss.col

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

It drops and executes the following files:

  • %System Root%\Winis7\opera.exe - also detected as WORM_WINIGA.AFK
  • %System%\inf\svchost.exe - detected as TROJ_COMREROP.AG

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

It creates the following folders:

  • %System Root%\Winis7
  • %System Root%\Winis7\Data
  • %System%\inf

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

Autostart Technique

This worm adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
AbGame = "%System Root%\Winis7\opera.exe"

Propagation

This worm drops the following copy(ies) of itself in all removable drives:

  • {drive}:\New.exe

Information Theft

This worm gathers the following data:

  • File Attach
  • IP host name
  • IP address
  • Application Path
  • Windows version
  • Service Pack version
  • BIOS version
  • Processor name
  • Machine GUID
  • Screen Resolution
  • Typed URLs

NOTES:

This worm steals the following information from Yahoo! Messenger:

  • Profiles
  • Archive Messages
  • Keystrokes

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

11.288.03

FIRST VSAPI PATTERN DATE:

20 Nov 2014

VSAPI OPR PATTERN File:

11.289.00

VSAPI OPR PATTERN Date:

21 Nov 2014

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

Remove malware/grayware files dropped/downloaded by WORM_WINIGA.AFK. (Note: Please skip this step if the threats listed below have already been removed.)

    • TROJ_COMREROP.AG

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

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
    • AbGame = "%System Root%\Winis7\opera.exe"

Step 6

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\Winis7
  • %System%\inf

Step 7

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


Did this description help? Tell us how we did.