BKDR_MATSNU.JB
Trojan:Win32/Matsnu (Microsoft), Trojan.Win32.Yakes.cowi (Kaspersky)
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.
It executes then deletes itself afterward.
TECHNICAL DETAILS
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%\{random}\{random}.exe
- %User Profile%\{random}\{random}.exe
- %User Temp%\{random}\{random}.exe
- %User Temp%\{random}.pre - deleted afterwards
(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
It executes then deletes itself afterward.
It injects codes into the following process(es):
- svchost.exe
- ctfmon.exe
- explorer.exe
Autostart Technique
This Trojan creates the following registry entries to enable automatic execution of dropped component at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = "%Application Data%\{random}\{random}.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = "%%User Profile%\{random}\{random}.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random} = "%User Temp%\{random}\{random}.exe"
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}ieg.com/inbox.php
- http://{BLOCKED}-gt.com/inbox.php
- http://{BLOCKED}zxrz.com/inbox.php
- http://{BLOCKED}ect-proxy.com/inbox.php
- http://{BLOCKED}lines.com/inbox.php
- http://{BLOCKED}nline.com/inbox.php
- http://{BLOCKED}olderxx.com/inbox.php
- http://{BLOCKED}bspace-apo.com/inbox.php