BKDR_CRIDEX.GO
Trojan.Win32.Bublik.ycg (Kaspersky)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Backdoor
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
Arrival Details
This backdoor 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 backdoor drops the following copies of itself into the affected system and executes them:
- %User Profile%\Application Data\KB{random number}.exe
(Note: %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.)
It drops the following files:
- %User Profile%\Application Data\{random folder name}\{random file name}
(Note: %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.)
It creates the following folders:
- %User Profile%\Application Data\{random folder name}
(Note: %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.)
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
KB{random number}.exe = "%User Profile%\Application Data\KB{random number}.exe"
Other System Modifications
This backdoor adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\{random value 1}
HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\{random value 2}
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings
GlobalUserOffline = "0"
Other Details
This backdoor connects to the following possibly malicious URL:
- http://{BLOCKED}.{BLOCKED}.61.59:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.102.204:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.188.156:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.68.239:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.174.136:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.17.180:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.226.30:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.156.170:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.109.204:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.147.52:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.30.202:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.23.100:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.100.41:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.73.220:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.94.96:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.221.6:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.19.236:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.89.82:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.107.25:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.237.170:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.229.10:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.113.66:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.120.32:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.250.157:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.100.108:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
- http://{BLOCKED}.{BLOCKED}.129.120:8080/LvI/xCA/GoZZkCAAAA/Noy6SAAAA
It deletes the initially executed copy of itself