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
Propagates via removable drives
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
110,592 bytes
EXE
Yes
04 Jan 2013
Compromises system security, Connects to URLs/IPs, Steals information
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