WORM_SERVSTART.A
Trojan:Win32/ServStart.gen!A (Microsoft); Trojan.Gen (Symantec); Trojan.Win32.Generic!BT (Sunbelt)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
Dropped by other malware, Downloaded from the Internet
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.
It uses a list of user names to gain access to password-protected shares.
It connects to certain websites to send and receive information. However, as of this writing, the said sites are inaccessible. It deletes the initially executed copy of itself.
TECHNICAL DETAILS
503,808 bytes
EXE
No
06 Oct 2012
Connects to URLs/IPs, Drops files, Steals information
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%\{random file name}.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
It then creates the following non-malicious file(s):
- %Temp%\Server.dll
(Note: %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp or C:\WINNT\Temp.)
It drops the following copies of itself into the affected system:
- F:\Server.exe
- E:\Server.exe
- D:\Server.exe
- C:\Server.exe
Autostart Technique
This worm registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Nationaljrq
Description = "Providesmid a domain server for NI security."
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Nationaljrq
DisplayName = "Nationalyta Instruments Domain Service"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Nationaljrq
ErrorControl = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Nationaljrq
ImagePath = "%System%\{random file name}.exe"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Nationaljrq
ObjectName = "LocalSystem"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Nationaljrq
Start = "2"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Nationaljrq
Type = "10"
Propagation
This worm searches the network for the following shared networks onto which it attempts to drop copies of itself:
- F$\Server.exe
- E$\Server.exe
- D$\Server.exe
- C$\Server.exe
- admin$\Server.exe
It uses the following list of user names to gain access to password-protected shares:
- woaini
- angel
- asdfgh
- 1314520
- 5201314
- caonima
- 88888
- bbbbbb
- 12345678
- memory
- abc123
- qwerty
- 123456
- password
- enter
- xpuser
- money
- guest
- admin
- administrator
- movie
Other Details
This worm connects to the following website to send and receive information:
- {BLOCKED}156.{BLOCKED}2.org:80
However, as of this writing, the said sites are inaccessible.
It deletes the initially executed copy of itself
SOLUTION
9.200
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Restart in Safe Mode
Step 3
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\SYSTEM\CurrentControlSet\Services
- Nationaljrq
- Nationaljrq
Step 4
Search and delete these files
Step 5
Scan your computer with your Trend Micro product to delete files detected as WORM_SERVSTART.A. 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.
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