TROJ_SISCOS_DD3004D6.UVPA
Backdoor:Win32/Zegost.CH (Microsoft); Trojan.Gen (Symantec); Trojan.Win32.Siscos.pnn (Kaspersky); Trojan.Win32.Dtcontx.dba (v) (Sunbelt); Trojan horse Agent4.AQWN (AVG)
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
122,880 bytes
EXE
Yes
28 Sep 2014
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:
- %Program Files%\wininlt.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
wininlt = "%Program Files%\wininlt.exe"
It registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Protection program
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Qfyyok ueeyei
Other System Modifications
This Trojan adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Protection program
ReleiceName = "Qfyyok ueeyei"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Qfyyok ueeyei
ConnectGroup = "1433"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\Qfyyok ueeyei
MarkTime = "2013-10-28 04:00"
This report is generated via an automated analysis system.
SOLUTION
9.700
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
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
- Protection program
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- Qfyyok ueeyei
Step 4
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\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- wininlt = "%Program Files%\wininlt.exe"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Protection program
- ReleiceName = "Qfyyok ueeyei"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Qfyyok ueeyei
- ConnectGroup = "1433"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Qfyyok ueeyei
- MarkTime = "2013-10-28 04:00"
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_SISCOS_DD3004D6.UVPA. 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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