BKDR_POISON.BKM
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Backdoor
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users. 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 does not have any propagation routine.
It does not have any downloading capability.
It logs a user's keystrokes to steal information.
TECHNICAL DETAILS
Arrival Details
This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
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 backdoor drops the following non-malicious file:
- {malware path and filename}
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- !VoqA.I4
It injects itself into the following processes as part of its memory residency routine:
- EXPLORER.EXE
Autostart Technique
This backdoor adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{GUID}
StubPath = "{malware path and filename}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
xmlprv = "{malware path and filename}"
Propagation
This backdoor does not have any propagation routine.
Backdoor Routine
This backdoor opens the following port(s) where it listens for remote commands:
- TCP port 8080
It connects to the following URL(s) to send and receive commands from a remote malicious user:
- proxy19.{BLOCKED}n.co.jp
Download Routine
This backdoor does not have any downloading capability.
Information Theft
This backdoor logs a user's keystrokes to steal information.
NOTES:
This backdoor does not have rootkit capabilities.
This backdoor does not exploit any vulnerability.
It can perform the following actions:
- Capture screen, audio, and webcam
- Log keystrokes
- List active ports
- Manage open windows
- Manage passwords
- Manage registry, processes, services, devices, and installed applications
- Perform multiple simultaneous transfers
- Perform remote shell
- Relay server
- Search files
- Share servers
- Update, restart, terminates itself
SOLUTION
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Scan your computer with your Trend Micro product and note files detected as BKDR_POISON.BKM
Step 3
Restart in Safe Mode
Step 4
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{GUID}
- StubPath = "{malware path and filename}"
- StubPath = "{malware path and filename}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- xmlprv = "{malware path and filename}"
- xmlprv = "{malware path and filename}"
Step 5
Search and delete these files
- {malware path and filename}
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_POISON.BKM. 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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