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WORM_ANTINNY.JB

July 04, 2016
 Analysis by: Mark Joseph Manahan
 Modified by: Mar Philip Elaurza
 ALIASES:

Worm:Win32/Antinny.A (Microsoft), W32/Antinny.worm.a (McAfee), W32.HLLW.Antinny (Symantec)

 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:

Propagates via peer-to-peer networks


This worm arrives via peer-to-peer (P2P) shares.

  TECHNICAL DETAILS

File Size:

651,264 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

20 Mar 2011

Payload:

Displays message/message boxes

Arrival Details

This worm arrives via peer-to-peer (P2P) shares.

Installation

This worm adds the following folders:

  • {malware path}\Up

It drops the following non-malicious files:

  • %System%\UNLHA32.dll
  • %System%\zip32.dll
  • %System%\zip32j.dll
  • {malware path}\UpFolder.txt

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

It drops the following copies of itself into the affected system:

  • %Program Files%\{random program folder}\{random program filename}{random characters}.exe
  • %User Temp%\ny.exe
  • {malware path}\Up\{random file name}.exe

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.. %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.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
ara-key = "%Program Files%\{random program folder}\{random program filename}{random characters}.exe -StartUp"

Other System Modifications

This worm deletes the following files:

  • %User Temp%\{filename}.{file extension}

(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.)

It deletes the following folders:

  • %User Temp%\{subfolders}

(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.)

Propagation

This worm drops copies of itself into the following folders used in peer-to-peer (P2P) networks:

  • Winny.exe

Other Details

This worm displays the following message boxes:


NOTES:

This malware modifies the file WIN.INI and appends the following information:

[{random characters}]
{random characters}={malware path}

  SOLUTION

Minimum Scan Engine:

9.800

VSAPI OPR PATTERN File:

5.883.00

VSAPI OPR PATTERN Date:

07 Apr 2009

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

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_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    • ara-key = "%Program Files%\{random program folder}\{random program filename}{random characters}.exe -StartUp"

Step 5

Search and delete this file

[ Learn More ]
There may be some files 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.
  • %System%\UNLHA32.dll
  • %System%\zip32.dll
  • %System%\zip32j.dll
  • {malware path}\UpFolder.txt

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.
  • {malware path}\Up

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_ANTINNY.JB. 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 8

Scan your computer with your Trend Micro product to delete files detected as WORM_ANTINNY.JB. 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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