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PE_ARROW.B

April 14, 2013
 ALIASES:

Virus:Win32/Arrow.C (Microsoft); W32/Darro.gen (McAfee); W32.Darro (Symantec); Virus.Win32.Arrow.c (Kaspersky); LooksLike.Win32.InfectedFile!A (v) (Sunbelt)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:

  • Threat Type: File infector

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This file infector 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:

99,103 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

13 Dec 2012

Arrival Details

This file infector 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 file infector drops the following copies of itself into the affected system:

  • %User Temp%\KUM.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Autostart Technique

This file infector registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\RKREVEAL150

Other System Modifications

This file infector deletes the following files:

  • HICBTH

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\RKREVEAL150
Type = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\RKREVEAL150
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\RKREVEAL150
Start = "3"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\RKREVEAL150
ImagePath = "\??\%System%\Drivers\RKREVEAL150.SYS"

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\RKREVEAL150\Enum

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Services\RKREVEAL150\Security

Dropping Routine

This file infector drops the following files:

  • %System%\Drivers\RKREVEAL150.SYS

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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 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\System\CurrentControlSet\Services
    • RKREVEAL150

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\SYSTEM\ControlSet001\Services\RKREVEAL150
    • Type = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\RKREVEAL150
    • ErrorControl = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\RKREVEAL150
    • Start = "3"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\RKREVEAL150
    • ImagePath = "\??\%System%\Drivers\RKREVEAL150.SYS"

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%\Drivers\RKREVEAL150.SYS

Step 6

Restart in normal mode and scan your computer with your Trend Micro product for files detected as PE_ARROW.B. 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 7

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.

  • HICBTH

Step 8

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\CurrentControlSet\Services\RKREVEAL150
    • Enum
  • In HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\RKREVEAL150
    • Security


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