WORM_OTORUN.FBB

October 15, 2015
 Analysis by: Jennifer Gumban
 ALIASES:

Worm:Win32/Hamweq.A (Microsoft); W32/Hamweq.worm.aj (McAfee); Trojan.Gen (Symantec); Trojan.Win32.Buzus.hizi (Kaspersky); Worm.Win32.Hamweq (Sunbelt); Trojan.Generic.1408921 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This worm arrives via removable drives. It 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:

Varies

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

06 Apr 2012

Arrival Details

This worm arrives via removable drives.

It 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 copies of itself into the affected system:

  • %System Root%\RESTORE\S-1-5-21-1482476501-1644491937-682003330-1013\sndmgr.exe

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

It creates the following folders:

  • %System Root%\RESTORE
  • %System Root%\RESTORE\S-1-5-21-1482476501-1644491937-682003330-1013

(Note: %System Root% is the Windows root folder, where it usually is C:\ 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_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{clsid}
StubPath = "%System Root%\RESTORE\S-1-5-21-1482476501-1644491937-682003330-1013\ise32.exe"

Other System Modifications

This worm adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Active Setup\Installed Components\{clsid}

Propagation

This worm creates the following folders in all removable drives:

  • {removable drive}:\RESTORE\S-1-5-21-1482476501-1644491937-682003330-1013

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

  • {removable drive}:\RESTORE\S-1-5-21-1482476501-1644491937-682003330-1013\ise32.exe

Dropping Routine

This worm drops the following files:

  • %System Root%\RESTORE\S-1-5-21-1482476501-1644491937-682003330-1013\Desktop.ini

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

Other Details

This worm connects to the following possibly malicious URL:

  • hubhub.{BLOCKED}2.com

  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

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 key

[ 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\Active Setup\Installed Components
    • {clsid} = ""

Step 5

Search and delete these folders

[ 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.
  • {removable drive}:\RESTORE\S-1-5-21-1482476501-1644491937-682003330-1013
  • %System Root%\RESTORE\S-1-5-21-1482476501-1644491937-682003330-1013

Step 6

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