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WORM_HAMWEQ.BU

August 23, 2014
 Modified by: Rhena Inocencio
 ALIASES:

Worm:Win32/Hamweq.gen!C (Microsoft); W32/Hamweq.worm.y (McAfee); W32.SillyFDC (Symantec); PAK:PE_Patch, PAK:ASProtect, Packed.Win32.Black.d (Kaspersky); Worm.Win32.AutoRun.vhg (v) (Sunbelt); Worm.Generic.60066 (FSecure)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • 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.

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

08 Apr 2009

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%\CONFIG\S-1-5-21-1482476501-1644491937-682003330-1013\usr.exe
  • %System Root%\RESTORE\S-1-5-21-1482476501-1644491937-682003330-1013\SYS32.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It creates the following folders:

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

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

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\{28ABC5C0-4FCB-11CF-AAX5-21CX3C644241}
StubPath = "%System Root%\CONFIG\S-1-5-21-1482476501-1644491937-682003330-1013\usr.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{28ABC5C0-4FCB-11CF-AAX5-21CX1C642122}
StubPath = "%System Root%\RESTORE\S-1-5-21-1482476501-1644491937-682003330-1013\SYS32.exe"

Propagation

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

  • {drive letter}:\RESTORE\S-1-5-21-1482476501-1644491937-682003330-1013\SYS32.exe
  • {drive letter}:\CONFIG\S-1-5-21-1482476501-1644491937-682003330-1013\usr.exe

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

Other Details

This worm connects to the following possibly malicious URL:

  • http://dp.{BLOCKED}s.in

  SOLUTION

Minimum Scan Engine:

9.300

VSAPI OPR PATTERN File:

5.883.00

VSAPI OPR PATTERN Date:

08 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

Restart in Safe Mode

[ Learn More ]

Step 3

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\Active Setup\Installed Components\{28ABC5C0-4FCB-11CF-AAX5-21CX1C642122}
    • StubPath = "%System Root%\RESTORE\S-1-5-21-1482476501-1644491937-682003330-1013\SYS32.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{28ABC5C0-4FCB-11CF-AAX5-21CX1C642122}
    • StubPath = "%System Root%\CONFIG\S-1-5-21-1482476501-1644491937-682003330-1013\usr.exe"

Step 4

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.
  • %System Root%\RESTORE
  • %System Root%\CONFIG
  • {drive letter}:\RESTORE
  • {drive letter}:\CONFIG

Step 5

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