WORM_AGENT.ACCD
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)
Windows 2000, Windows XP, Windows Server 2003
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
25,600 bytes
EXE
No
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
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
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
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
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""
- From: CheckedValue = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PCHealth\ErrorReporting
- From: DoReport = "0"
To: DoReport = ""1""
- From: DoReport = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PCHealth\ErrorReporting
- From: ShowUI = "0"
To: ShowUI = ""1""
- From: ShowUI = "0"
Step 5
Search and delete these components
- %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
- %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
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