Modified by: Rika Joi Gregorio
ALIASES:

Win32/MalPlurk.E trojan(Eset)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

This Trojan 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 backdoor routine.

It does not drop any other file.

It does not have any downloading capability.

  TECHNICAL DETAILS

File Size: 90,112 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 28 Oct 2013
Payload: Connects to URLs/IPs

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Dropping Routine

This Trojan does not drop any other file.

Download Routine

This Trojan does not have any downloading capability.

Other Details

This Trojan connects to the following URL(s) to check for an Internet connection:

  • http://blogs.yahoo.co.jp/dueyamata/63952915.html
  • http://blogs.yahoo.co.jp/katamato201308/66465798.html

NOTES:

This malware may connect to the following URL for plurk to return an error page with different plurk accounts:

  • www.plurk.com/blogs.yahoo.co.jp/dueyamata/63952915.html
  • www.plurk.com/blogs.yahoo.co.jp/katamato201308/66465798.html

It then visits the accounts and read the html page and look for the following strings:

  • carefully read and accept our terms and

If found, it will decrypt the code of the said html page. The code may be used by the malware to perform other malicious routines.

This malware has the capability to get the affected system's IP address and send it as the following:

  • http://{domain name}/usr/{encrypted IP address}

Where {domain name} depends on the encrypted html code.

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine: 9.300
FIRST VSAPI PATTERN FILE: 10.370.03
FIRST VSAPI PATTERN DATE: 28 Oct 2013
VSAPI OPR PATTERN File: 10.371.00
VSAPI OPR PATTERN Date: 29 Oct 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 2

Scan your computer with your Trend Micro product and note files detected as TROJ_MALPLURK.BC

Step 3

Terminate a process file/s detected as TROJ_MALPLURK.BC

[ Learn More ]

*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_MALPLURK.BC. 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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