Summary
Backdoor:W32/Agent.DLQR is a backdoor program created by an attacker using a malware creation kit. It may be dropped onto a target computer system by a separate dropper program (detected as Trojan-Dropper:W32/Agent.DQLQ).
Removal
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
Check for the latest database updates
First, check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.
Technical Details
As its payload, the backdoor drops a DLL file that provides an external attacker control over the compromised machine. The file is partially encrypted with very simple XOR-key encryption. It is not polymorphic.
The DLL is dropped in one of the following locations:
- %windir%
- windir\system32
- %systemroot%
- %systemroot%\system32
- %userprofile%
- %alluserprofile%
- %appdata%
- %commonprogramfiles%
- %programfiles%
- %temp
The specific location is defined by the attacker when the backdoor is created, as is the name for the DLL file. The name may be random.
Once dropped, the DLL will connect to a remote command and control (C and C) server, giving an external attacker extensive control over the infected computer by offering a file browser, command prompt and a registry browser. The address of the server is also defined by the attacker and may therefore vary.
More
This malware is also discussed in a white paper from McAfee:
- http://www.mcafee.com/us/resources/white-papers/wp-global-energy-cyberattacks-night-dragon.pdf
Network Traffic
If a network infection is suspected, infected machines may be found by inspecting the network traffic.
Machines that are currently connected to the command and control server will send the following network traffic:
- (Example of this tcp-packet in hex format) 03 50 00 00 00 00 00 00 00 00 00 00 68 57 24 13
According to the McAfee paper, the following regular expression can be used to find those packages:
- \x03\x50[\x00-\xff]+\x68\x57\x24\x13
Machines that have not been able to connect to the command and control server will send the following network traffic:
- (Example of this tcp-packet in hex format) 01 50 00 00 00 00 00 00 00 00 00 01 68 57 24 13
According to the McAfee paper, the following regular expression can be used to find those packages:
- \x01\x50[\x00-\xff]+\x68\x57\x24\x13
If these suspect samples are found, please send them to our Submit A Sample (SAS) page for further investigation.
Protect your devices from malware with F‑Secure Total
Protecting your devices from malicious software is essential for maintaining online security. F‑Secure Total makes this easy, helping you to secure your devices in a brilliantly simple way.
Award‑winning antivirus and malware protection
Online browsing, banking, and shopping protection
24/7 online identity and data breach monitoring
Unlimited VPN service to safeguard your privacy
Password manager with private data protection
Choose how many devices you want to protect to get started.
Free customer support
Cancel anytime
The trial does not obligate you to buy the product
After 30 days your subscription will renew automatically for one year at €69.99.
)
)
More Support
Community
Ask questions in our Community.
User guides
Check the user guide for instructions.
Contact Support
Chat with with or call an agent.
Submit a Sample
Submit a file or URL for analysis.