BKDR_ELIRKS.FDD
probably a variant of Win32/MalPlurk.E trojan (NOD32)
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: Backdoor
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
Dropped by other malware
This backdoor may be dropped by other malware.
It does not have any propagation routine.
It executes commands from a remote malicious user, effectively compromising the affected system.
It does not drop any other file.
It retrieves specific information from the affected system.
It attempts to access certain websites. However, the websites are inaccessible as of this writing.
TECHNICAL DETAILS
102,400 bytes
DLL
Yes
14 Nov 2013
Connects to URLs/IPs, Collects system information
Arrival Details
This backdoor may be dropped by the following malware:
- TROJ_DLOADE.FDD
Propagation
This backdoor does not have any propagation routine.
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
- Gather System Information
- Get Disk Drive information
- Search File/s
- Download File/s
- Delete itself
- Take screenshot
- Execute shell command
- Terminate process/es
- Get modules of running processes
Dropping Routine
This backdoor does not drop any other file.
Information Theft
This backdoor retrieves the following information from the affected system:
- User name
- Computer name
- Operating System Version
- Affected machine's IP address
Other Details
This backdoor attempts to access certain websites. However, the websites are inaccessible as of this writing.
It connects to the following possibly malicious URL:
- http://{BLOCKED}check201.{BLOCKED}s.us/usr/{encrypted IP Address}
- http://{BLOCKED}word621.{BLOCKED}2.us/usr/{encrypted IP Address}
- http://{BLOCKED}rld1203.{BLOCKED}izeddns.org/usr/{encrypted IP Address}
NOTES:
It connects to a certain Plurk website to obtain the C&C server it will connect to. However, it was not able to retrieve the Plurk website because the URLs it connects to are already inaccessible.
It uses the default User Agent in URLs it accesses. It does this by querying the following registry value:
HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings
User Agent
It does not have rootkit capabilities.
It does not exploit any vulnerability.
SOLUTION
9.700
10.419.00
19 Nov 2013
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 3
Scan your computer with your Trend Micro product and note files detected as BKDR_ELIRKS.FDD
Step 4
Restart in Safe Mode
Step 5
Search and delete the files detected as BKDR_ELIRKS.FDD
*Note: Some component files may be hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
To stop the malware/grayware from running when certain files are opened:
For Windows 2000, Windows XP, and Windows Server 2003:
- Right-click Start then click Search....
- In the Named input box, type the name of the file that was detected earlier.
- In the Look In drop-down list, select My Computer then press Enter.
- Once located, select the file then press SHIFT+DELETE to delete it.
For Windows Vista and Windows 7:
- Click Start>Computer.
- In the Search Computer input box, type the name of the file detected earlier, and press Enter.
- Once located, select the file then press SHIFT+DELETE to delete it.
*Note: Read the following Microsoft page if these steps do not work on Windows 7.
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_ELIRKS.FDD. 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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