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BKDR_FYNLOS.SM1

July 17, 2013
 Modified by: Rhena Inocencio
 ALIASES:

Trojan:Win32/Cryptrun.B (Microsoft), Generic FakeAlert!wf (McAfee), Trojan.Gen.2 (Symantec), Trojan-Downloader.Win32.FraudLoad.zpjm (Kaspersky)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Spammed via email, Downloaded from the Internet, Dropped by other malware


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 may be dropped by other malware.

It does not have any propagation routine.

It does not drop any other file.

It does not have any information-stealing capability.

  TECHNICAL DETAILS

File Size:

514,560 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

23 Apr 2012

Payload:

Connects to URLs/IPs

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.

It may be dropped by the following malware:

  • BKDR_FYNLOS.SM

Propagation

This backdoor does not have any propagation routine.

Backdoor Routine

This backdoor opens the following ports:

  • 80

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}3.{BLOCKED}8.242.84

Dropping Routine

This backdoor does not drop any other file.

Information Theft

This backdoor does not have any information-stealing capability.

Other Details

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

  • http://www.google.com/search?qu=

NOTES:
It connects to its command-and-control(C&C) server using the parameter:

  • /search{numbers}?h1={value}&h2={value}&h3={encoded computer name}&h4={encoded volume serial number}
If the backdoor connection is successful, it may perform the following routines:
  • Download and upload files
  • Execute, delete or copy files
  • List or terminate processes
  • List or change directories
  • Perform shell commands

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

8.930.04

FIRST VSAPI PATTERN DATE:

23 Apr 2012

VSAPI OPR PATTERN File:

8.931.00

VSAPI OPR PATTERN Date:

23 Apr 2012

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

Remove the malware/grayware file that dropped/downloaded BKDR_FYNLOS.SM1

Step 3

Identify and terminate files detected as BKDR_FYNLOS.SM1

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

Scan your computer with your Trend Micro product to delete files detected as BKDR_FYNLOS.SM1. 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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