TROJ_MEDFOS.SME
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan arrives as a file that exports the functions of other malware/grayware. It may arrive bundled with malware packages as a malware component. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It modifies files, disabling programs and applications from properly running.
It connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats.
TECHNICAL DETAILS
Arrival Details
This Trojan arrives as a file that exports the functions of other malware/grayware.
It may arrive bundled with malware packages as a malware component.
It 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 file(s)/component(s):
- %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions.sqlite
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)
Other System Modifications
This Trojan modifies the following files:
- %Application Data%\Mozilla\Firefox\Profiles\4wwmjcqo.default\extensions.ini
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Mozilla\
Firefox\Extensions
{9D7673B2-B93D-11E1-8270-B8AC6F996F26} = "%Application Data%\{9D7673B2-B93D-11E1-8270-B8AC6F996F26}\"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
a = "ODUuMTcuMTMyLjMzOwAA"
Download Routine
This Trojan connects to the following malicious URLs:
- http://{BLOCKED}dfile.com/file/id=AwAyAAEAXXYJAAEFAJAAAAAAAAAAIwwGEAsAAACyc
3ad4RE9uay4cIImb5lvVVVVVVVVVVVVVVVVVVVVVQ
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAADRW&c=3