TROJ_MORTO.AB
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: No
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 does not have any propagation routine.
It does not have any backdoor routine.
It does not have any information-stealing capability.
It requires its main component to successfully perform its intended routine.
TECHNICAL DETAILS
29,696 bytes
EXE
Yes
22 Jul 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.
Other System Modifications
This Trojan adds the following registry entries as part of its installation routine:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
CertificateRevocation = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
DisableCachingOfSSLPages = "1"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoFavoritesMenu = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\ODBC
id2 = "{alphanumeric values}"
It modifies the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
1001 = "3"
(Note: The default value data of the said registry entry is 1.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
1201 = "0"
(Note: The default value data of the said registry entry is 3.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
1601 = "0"
(Note: The default value data of the said registry entry is 1.)
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
1C00 = "0"
(Note: The default value data of the said registry entry is 10000.)
Propagation
This Trojan does not have any propagation routine.
Backdoor Routine
This Trojan does not have any backdoor routine.
Process Termination
This Trojan terminates processes or services that contain any of the following strings if found running in the affected system's memory:
- 360rp
- ACAAS
- ArcaConfSV
- AvastSvc
- FPAVServer
- FortiScand
- GDFwSvc
- K7RTScan
- KVSrvXP
- MPSvc
- MsMpEng
- NSESVC.EXE
- PavFnSvr
- RavMonD
- SavService
- SpySweeper
- Vba32Ldr
- a2service
- avguard
- avgwdsvc
- avpmapp
- ccSvcHst
- cmdagent
- coreServiceShell
- freshclam
- fsdfwd
- knsdave
- kxescore
- mcshield
- scanwscs
- vsserv
- zhudongfangyu
Information Theft
This Trojan does not have any information-stealing capability.
Other Details
This Trojan requires its main component to successfully perform its intended routine.
NOTES:
This Trojan connects to certain URL to download additional information and updated copy of itself.
It saves its downloaded file as {random}~MTMP{random}.EXE .
It can be executed by its main component using the following parameters:
[malware name] [URL] [port (optional)]
It drops unins.BAT to delete itself.
It deletes the following event logs:
- Application log
- Security log
- System log
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
9.300
10.174.05
25 Jul 2013
10.175.00
26 Jul 2013
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 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\Internet Settings
- CertificateRevocation = "1"
- CertificateRevocation = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
- DisableCachingOfSSLPages = "1"
- DisableCachingOfSSLPages = "1"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
- NoFavoritesMenu = "1"
- NoFavoritesMenu = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\ODBC
- id2 = "{alphanumeric values}"
- id2 = "{alphanumeric values}"
Step 4
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\CurrentVersion\Internet Settings\Zones\3
- From: 1001 = "3"
To: 1001 = "1"
- From: 1001 = "3"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
- From: 1201 = "0"
To: 1201 = "3"
- From: 1201 = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
- From: 1601 = "0"
To: 1601 = "1"
- From: 1601 = "0"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
- From: 1C00 = "0"
To: 1C00 = "10000"
- From: 1C00 = "0"
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_MORTO.AB. 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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