TROJ_EKSPLOYT.ED
TrojanDropper:Win32/Evotob.A (Microsoft); Win32/Exploit.CVE-2013-3660.L (ESET-NOD32); EXP/CVE20133660.229570 (Avira)
Windows
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.
However, as of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
229,570 bytes
EXE
Yes
23 Jun 2015
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%\Mozilla\svchoste.exe
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
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
Generic Host Process = "%Application Data%\Mozilla\svchoste.exe"
Other System Modifications
This Trojan adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Extensions
*.dll = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Extensions
*.exe = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Extensions
*.tmp = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
afwqs.exe = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
consent.exe = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
explorer.exe = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
rgjdu.exe = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
rundll32.exe = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
spoolsv.exe = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Microsoft Antimalware\Exclusions\Processes
svchost.exe = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Extensions
*.dll = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Extensions
*.exe = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Extensions
*.tmp = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
afwqs.exe = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
consent.exe = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
explorer.exe = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
rgjdu.exe = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
rundll32.exe = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
spoolsv.exe = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows Defender\Exclusions\Processes
svchost.exe = "0"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion
ZonesSecurityTestUpgrade = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion
wowsys64datecheck = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile
DisableNotifications = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile
DoNotAllowExceptions = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\DomainProfile
EnableFirewall = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\publicprofile
DisableNotifications = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\publicprofile
DoNotAllowExceptions = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\publicprofile
EnableFirewall = "0"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
EnableFirewall = "0"
(Note: The default value data of the said registry entry is "1".)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "1"
(Note: The default value data of the said registry entry is "0".)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}n.bingecho.cc/common/echo.php
However, as of this writing, the said sites are inaccessible.
SOLUTION
9.700
11.747.00
23 Jun 2015
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
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Restart in Safe Mode
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
- Generic Host Process = "%Application Data%\Mozilla\svchoste.exe"
- Generic Host Process = "%Application Data%\Mozilla\svchoste.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Extensions
- *.dll = "0"
- *.dll = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Extensions
- *.exe = "0"
- *.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Extensions
- *.tmp = "0"
- *.tmp = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Processes
- afwqs.exe = "0"
- afwqs.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Processes
- consent.exe = "0"
- consent.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Processes
- explorer.exe = "0"
- explorer.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Processes
- rgjdu.exe = "0"
- rgjdu.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Processes
- rundll32.exe = "0"
- rundll32.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Processes
- spoolsv.exe = "0"
- spoolsv.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Antimalware\Exclusions\Processes
- svchost.exe = "0"
- svchost.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Extensions
- *.dll = "0"
- *.dll = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Extensions
- *.exe = "0"
- *.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Extensions
- *.tmp = "0"
- *.tmp = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes
- afwqs.exe = "0"
- afwqs.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes
- consent.exe = "0"
- consent.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes
- explorer.exe = "0"
- explorer.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes
- rgjdu.exe = "0"
- rgjdu.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes
- rundll32.exe = "0"
- rundll32.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes
- spoolsv.exe = "0"
- spoolsv.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Processes
- svchost.exe = "0"
- svchost.exe = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
- ZonesSecurityTestUpgrade = "1"
- ZonesSecurityTestUpgrade = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
- wowsys64datecheck = "1"
- wowsys64datecheck = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile
- DisableNotifications = "1"
- DisableNotifications = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile
- DoNotAllowExceptions = "0"
- DoNotAllowExceptions = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\DomainProfile
- EnableFirewall = "0"
- EnableFirewall = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\publicprofile
- DisableNotifications = "1"
- DisableNotifications = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\publicprofile
- DoNotAllowExceptions = "0"
- DoNotAllowExceptions = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\publicprofile
- EnableFirewall = "0"
- EnableFirewall = "0"
Step 5
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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- From: EnableFirewall = "0"
To: EnableFirewall = "1"
- From: EnableFirewall = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- From: DisableNotifications = "1"
To: DisableNotifications = "0"
- From: DisableNotifications = "1"
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_EKSPLOYT.ED. 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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