WORM_AGENT.ACCD


 ALIASES:

Trojan:Win32/Malamiko.A (Microsoft); BackDoor-DKA (McAfee); Downloader (Symantec); PAK:ASPack, Worm.Win32.AutoRun.nxi, Worm.Win32.AutoRun.nxi (Kaspersky); BehavesLike.Win32.Malware.ssc (mx-v) (Sunbelt); Worm:W32/AutoRun.ED (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 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:

25,600 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

10 May 2012

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 copies of itself into the affected system:

  • %System%\AB6D4E5D.EXE

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

It creates the following folders:

  • %User Profile%\Application Data\VMware

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

Other System Modifications

This worm adds the following registry keys:

HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\
Services\B09AFA5A

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\B09AFA5A
Description = "7DA74D1C"

HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\
Services\B09AFA5A
Description = "7DA74D1C"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\B09AFA5A
DisplayName = "B09AFA5A"

HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\
Services\B09AFA5A
DisplayName = "B09AFA5A"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\B09AFA5A
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\B09AFA5A
ImagePath = "%System%\AB6D4E5D.EXE -k"

HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\
Services\B09AFA5A
ImagePath = "%System%\AB6D4E5D.EXE -k"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\B09AFA5A
ObjectName = "LocalSystem"

HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\
Services\B09AFA5A
ObjectName = "LocalSystem"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\B09AFA5A
Start = "2"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\B09AFA5A
Type = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT
ReportBootOk = "1"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\Hidden\
SHOWALL
CheckedValue = "0"

(Note: The default value data of the said registry entry is 1.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
PCHealth\ErrorReporting
DoReport = "0"

(Note: The default value data of the said registry entry is 1.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
PCHealth\ErrorReporting
ShowUI = "0"

(Note: The default value data of the said registry entry is 1.)

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\ERSvc\Parameters

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\ERSvc\Security

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\ERSvc\Enum

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\ERSvc

Dropping Routine

This worm drops the following files:

  • %System%\delme.bat
  • %System%\7DA74D1C.DLL
  • %System%\AB6D4E5D.EXE
  • %System Root%\auto.exe
  • d:\auto.exe
  • e:\auto.exe
  • f:\auto.exe
  • g:\auto.exe
  • h:\auto.exe
  • i:\auto.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

Other Details

This worm connects to the following possibly malicious URL:

  • http://alexa.{BLOCKED}x.cn//alexa.txt

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

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_CURRENT_USER\SYSTEM\CurrentControlSet\Services
    • B09AFA5A

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\SYSTEM\ControlSet001\Services\B09AFA5A
    • Description = "7DA74D1C"
  • In HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\Services\B09AFA5A
    • Description = "7DA74D1C"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\B09AFA5A
    • DisplayName = "B09AFA5A"
  • In HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\Services\B09AFA5A
    • DisplayName = "B09AFA5A"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\B09AFA5A
    • ErrorControl = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\B09AFA5A
    • ImagePath = "%System%\AB6D4E5D.EXE -k"
  • In HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\Services\B09AFA5A
    • ImagePath = "%System%\AB6D4E5D.EXE -k"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\B09AFA5A
    • ObjectName = "LocalSystem"
  • In HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\Services\B09AFA5A
    • ObjectName = "LocalSystem"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\B09AFA5A
    • Start = "2"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\B09AFA5A
    • Type = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT
    • ReportBootOk = "1"

Step 4

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
    • From: CheckedValue = "0"
      To: CheckedValue = ""1""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PCHealth\ErrorReporting
    • From: DoReport = "0"
      To: DoReport = ""1""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PCHealth\ErrorReporting
    • From: ShowUI = "0"
      To: ShowUI = ""1""

Step 5

Search and delete these components

[ Learn More ]
There may be some components 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%\delme.bat
  • %System%\7DA74D1C.DLL
  • %System%\AB6D4E5D.EXE
  • %System Root%\auto.exe
  • d:\auto.exe
  • e:\auto.exe
  • f:\auto.exe
  • g:\auto.exe
  • h:\auto.exe
  • i:\auto.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.
  • %User Profile%\Application Data\VMware

Step 7

Scan your computer with your Trend Micro product to delete files detected as WORM_AGENT.ACCD. 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

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\ControlSet001\Services\ERSvc
    • Parameters
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\ERSvc
    • Security
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\ERSvc
    • Enum
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • ERSvc


Did this description help? Tell us how we did.