TROJ_DIRCRYPT.AL
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It disables Task Manager, Registry Editor, and Folder Options.
TECHNICAL DETAILS
504,804 bytes
EXE
Yes
06 Dec 2013
Arrival Details
This Trojan 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 Trojan drops the following copies of itself into the affected system:
- \?\C:\Program Files\xerox\saWRoJat.exe
- \?\C:\Documents and Settings\Wilbert\Local Settings\Application Data\Microsoft\aJTdzIeE.exe
- %User Temp%\nJaMdEHM.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.)
It creates the following folders:
- \?\C:\Documents and Settings\Wilbert\Application Data\Dirty
- %Application Data%\kzpIsLLy
- \?\C:\Program Files\Dirty
- \?\C:\Documents and Settings\Wilbert\Local Settings\Application Data\Dirty
- %Application Data%\cssCKgnt
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
ZiHyZnrI = "%Application Data%\Microsoft\aJTdzIeE.exe"
It modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = "%System%\userinit.exe,,%Program Files%\xerox\saWRoJat.exe"
(Note: The default value data of the said registry entry is %Windows%\system32\userinit.exe,.)
Other System Modifications
This Trojan modifies the following file(s):
- %User Profile%\Application Data\Microsoft
(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.)
It deletes the following files:
- \?\C:\Program Files\xerox\saWRoJat.exe:Zone.Identifier
- \?\C:\Documents and Settings\Wilbert\Local Settings\Application Data\Microsoft\aJTdzIeE.exe:Zone.Identifier
- %User Startup%\RbKsrITa.exe:Zone.Identifier
- %User Temp%\nJaMdEHM.exe:Zone.Identifier
- %User Profile%\S-1-5-21-1645522239-1292428093-682003330-1003\4a4ad625f364c18c1ab6565a40b9a3ba_6abce574-4afc-42c5-8ab9-5739a84d8a8b
(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.. %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.. %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.)
It deletes the following folders:
- %System Root%\{A14913F0-13E4-848E-F528-66C3B4FB4FC0}
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\Software\{EDDF73F5-5E7A-CF14-30BF-A14913F07575}
HKEY_CURRENT_USER\Software\{EDDF73F5-5E7A-CF14-30BF-A14913F07575}
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\policies\
system
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\{EDDF73F5-5E7A-CF14-30BF-A14913F07575}
ID = "{random values}"
HKEY_CURRENT_USER\Software\{EDDF73F5-5E7A-CF14-30BF-A14913F07575}
ID = "{random values}"
HKEY_CURRENT_USER\Software\{EDDF73F5-5E7A-CF14-30BF-A14913F07575}
PeriodDisabed = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\{EDDF73F5-5E7A-CF14-30BF-A14913F07575}
PeriodDisabed = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
EnableLUA = "0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DoNotAllowExceptions = "0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
EnableFirewall = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
UacDisableNotify = "1"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\wscsvc
Start = "4"
(Note: The default value data of the said registry entry is 2.)
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\wuauserv
Start = "4"
(Note: The default value data of the said registry entry is 2.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
AntiVirusOverride = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
AntiVirusDisableNotify = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
FirewallDisableNotify = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
FirewallOverride = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
UpdatesDisableNotify = "1"
It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
system
DisableTaskMgr = "1"
Dropping Routine
This Trojan drops the following files:
- \?\C:\Documents and Settings\Wilbert\Application Data\Dirty\alertwall.jpg
- \?\C:\Program Files\Dirty\DirtyDecrypt.exe
- \?\C:\Documents and Settings\Wilbert\Application Data\Dirty\DirtyDecrypt.exe
- \?\C:\Documents and Settings\Wilbert\Local Settings\Application Data\Dirty\DirtyDecrypt.exe
- %User Profile%\Microsoft\Crypto
- %User Profile%\Crypto\RSA
- %User Profile%\RSA\S-1-5-21-1645522239-1292428093-682003330-1003
- %User Startup%\RbKsrITa.exe
(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.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)
This report is generated via an automated analysis system.
SOLUTION
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
Identify and delete files detected as TROJ_DIRCRYPT.AL using either the Startup Disk or Recovery Console
Step 3
Enable Registry Editor, Task Manager, and Folder options
Step 4
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_LOCAL_MACHINE\Software
- {EDDF73F5-5E7A-CF14-30BF-A14913F07575}
- In HKEY_CURRENT_USER\Software
- {EDDF73F5-5E7A-CF14-30BF-A14913F07575}
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\policies
- system
Step 5
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- ZiHyZnrI = "%Application Data%\Microsoft\aJTdzIeE.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\{EDDF73F5-5E7A-CF14-30BF-A14913F07575}
- ID = "{random values}"
- In HKEY_CURRENT_USER\Software\{EDDF73F5-5E7A-CF14-30BF-A14913F07575}
- ID = "{random values}"
- In HKEY_CURRENT_USER\Software\{EDDF73F5-5E7A-CF14-30BF-A14913F07575}
- PeriodDisabed = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\{EDDF73F5-5E7A-CF14-30BF-A14913F07575}
- PeriodDisabed = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
- EnableLUA = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DisableNotifications = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DoNotAllowExceptions = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- EnableFirewall = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- UacDisableNotify = "1"
Step 6
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\SYSTEM\ControlSet001\Services\wscsvc
- From: Start = "4"
To: Start = ""2""
- From: Start = "4"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\wuauserv
- From: Start = "4"
To: Start = ""2""
- From: Start = "4"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- AntiVirusOverride = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- AntiVirusDisableNotify = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- FirewallDisableNotify = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- FirewallOverride = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
- UpdatesDisableNotify = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Userinit = "%System%\userinit.exe,,%Program Files%\xerox\saWRoJat.exe"
To: Userinit = ""%Windows%\system32\userinit.exe,""
- From: Userinit = "%System%\userinit.exe,,%Program Files%\xerox\saWRoJat.exe"
Step 7
Search and delete these components
- \?\C:\Documents and Settings\Wilbert\Application Data\Dirty\alertwall.jpg
- \?\C:\Program Files\Dirty\DirtyDecrypt.exe
- \?\C:\Documents and Settings\Wilbert\Application Data\Dirty\DirtyDecrypt.exe
- \?\C:\Documents and Settings\Wilbert\Local Settings\Application Data\Dirty\DirtyDecrypt.exe
- %User Profile%\Microsoft\Crypto
- %User Profile%\Crypto\RSA
- %User Profile%\RSA\S-1-5-21-1645522239-1292428093-682003330-1003
- %User Startup%\RbKsrITa.exe
Step 8
Search and delete these folders
- \?\C:\Documents and Settings\Wilbert\Application Data\Dirty
- %Application Data%\kzpIsLLy
- \?\C:\Program Files\Dirty
- \?\C:\Documents and Settings\Wilbert\Local Settings\Application Data\Dirty
- %Application Data%\cssCKgnt
Step 9
Scan your computer with your Trend Micro product to delete files detected as TROJ_DIRCRYPT.AL. 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 10
Restore deleted/modified files and/or registry entries from backup
*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- %User Profile%\Application Data\Microsoft
Step 11
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.
- \?\C:\Program Files\xerox\saWRoJat.exe:Zone.Identifier
- \?\C:\Documents and Settings\Wilbert\Local Settings\Application Data\Microsoft\aJTdzIeE.exe:Zone.Identifier
- %User Startup%\RbKsrITa.exe:Zone.Identifier
- %User Temp%\nJaMdEHM.exe:Zone.Identifier
- %User Profile%\S-1-5-21-1645522239-1292428093-682003330-1003\4a4ad625f364c18c1ab6565a40b9a3ba_6abce574-4afc-42c5-8ab9-5739a84d8a8b
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