TROJ_ARCHSMS.D
Trojan:Win32/Ontonphu.C (Microsoft), Trojan.Gen (Norton), Ransom!hi (NAI), Trojan.Win32.EncPk.acl (v) (Sunbelt), Trojan.Fakealert.39229 (BitDefender), W32/Yakes.LS!tr (Fortinet), Trojan.Win32.Ransom (Ikarus)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
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.
TECHNICAL DETAILS
86,016 bytes
EXE
Yes
02 Sep 2012
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:
- %Application Data%\{RANDOM_FILENAME}.exe
(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\Policies\
Explorer\Run
{RANDOM_FILENAME} = "%Application Data%\{RANDOM_FILENAME}.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{RANDOM_FILENAME} = "%Application Data%\{RANDOM_FILENAME}.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
run = "%Application Data%\{RANDOM_FILENAME}.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
{RANDOM_FILENAME} = "%Application Data%\{RANDOM_FILENAME}.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{RANDOM_FILENAME} = "%Application Data%\{RANDOM_FILENAME}.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "Explorer.exe,%Application Data%\{RANDOM_FILENAME}.exe"
Other System Modifications
This Trojan deletes the following files:
- %Windows%\system32\taskmgr.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
load = "%Application Data%\{RANDOM_FILENAME}.exe"
(Note: The default value data of the said registry entry is "".)
It creates the following registry entry(ies) to bypass Windows Firewall:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
{RANDOM_FILENAME} = "%Application Data%\{RANDOM_FILENAME}.exe:*:Enabled:{RANDOM_FILENAME}"
Dropping Routine
This Trojan drops the following files:
- %Windows%\system32\_taskmgr.exe
- %Windows%\system32\dllcache\taskmgr.exe
- %System Root%\System Volume Information\_restore{FBBEA330-2D45-4E31-95DF-6C7DAC1E0F24}\RP14\A000{RANDOM_DIGIT}.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}.{BLOCKED}.76.64/636585/cmd.php
NOTES:
It deletes the initially executed copy of itself and executes the copy it drops instead.
{RANDOM_FILENAME} can be any of the following:
- WinRAR SFX.exe
- Teamviewer.exe
- uCF2000.exe
- Winternals.exe
- Clients.exe
SOLUTION
9.300
9.872.06
13 Aug 2012
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
Step 3
Scan your computer with your Trend Micro product and note files detected as TROJ_ARCHSMS.D
Step 4
Remove the malware/grayware file dropped/downloaded by TROJ_ARCHSMS.D
- %Windows%\system32\_taskmgr.exe
- %Windows%\system32\dllcache\taskmgr.exe
- %System Root%\System Volume Information\_restore{FBBEA330-2D45-4E31-95DF-6C7DAC1E0F24}\RP14\A000{RANDOM_DIGIT}.exe
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\Policies\Explorer\Run
- {RANDOM_FILENAME} = "%Application Data%\{RANDOM_FILENAME}.exe"
- {RANDOM_FILENAME} = "%Application Data%\{RANDOM_FILENAME}.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {RANDOM_FILENAME} = "%Application Data%\{RANDOM_FILENAME}.exe"
- {RANDOM_FILENAME} = "%Application Data%\{RANDOM_FILENAME}.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows
- run = "%Application Data%\{RANDOM_FILENAME}.exe"
- run = "%Application Data%\{RANDOM_FILENAME}.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- {RANDOM_FILENAME} = "%Application Data%\{RANDOM_FILENAME}.exe"
- {RANDOM_FILENAME} = "%Application Data%\{RANDOM_FILENAME}.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- {RANDOM_FILENAME} = "%Application Data%\{RANDOM_FILENAME}.exe"
- {RANDOM_FILENAME} = "%Application Data%\{RANDOM_FILENAME}.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Winlogon
- Shell = "Explorer.exe,%Application Data%\{RANDOM_FILENAME}.exe"
- Shell = "Explorer.exe,%Application Data%\{RANDOM_FILENAME}.exe"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- {RANDOM_FILENAME} = "%Application Data%\{RANDOM_FILENAME}.exe:*:Enabled:{RANDOM_FILENAME}"
- {RANDOM_FILENAME} = "%Application Data%\{RANDOM_FILENAME}.exe:*:Enabled:{RANDOM_FILENAME}"
Step 6
Restore this modified 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 NT\CurrentVersion\Windows
- From: load = "%Application Data%\{RANDOM_FILENAME}.exe"
To: load = ""
- From: load = "%Application Data%\{RANDOM_FILENAME}.exe"
Step 7
Restore these deleted files from backup
*Note: Only Microsoft-related 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.
- %Windows%\system32\taskmgr.exe
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_ARCHSMS.D. 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.
Did this description help? Tell us how we did.