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BAT_DLOAD.SMJ

March 13, 2015
 Analysis by: Rika Joi Gregorio
 ALIASES:

Trojan.BAT.Downbat.a (Sunbelt), Troj/DownBat-A(Sophos), BAT/TrojanDownloader.Ftp.NOK trojan(Eset)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • 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.

  TECHNICAL DETAILS

File Size:

71 bytes

File Type:

BAT

Memory Resident:

No

Initial Samples Received Date:

09 Mar 2015

Payload:

Downloads files

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.

Download Routine

This Trojan downloads files from the following File Transfer Protocol (FTP) sites:

  • {BLOCKED}.{BLOCKED}.58.184
  • {BLOCKED}.{BLOCKED}.79.109 - connection reset
  • {BLOCKED}.{BLOCKED}.75.143 - file to download not found
  • {BLOCKED}.{BLOCKED}.213.66 - inaccessible
  • {BLOCKED}.{BLOCKED}.218.57 - inaccessible
  • {BLOCKED}.{BLOCKED}.165.136 - inaccessible
  • {BLOCKED}.{BLOCKED}.176.17 - inaccessible
  • {BLOCKED}.{BLOCKED}.146.161 - inaccessible

It saves the files it downloads using the following names:

  • C:\boot1.exe
  • C:\bootMarkNet32.exe
  • C:\bootnonsa.exe
  • C:\bootslrvdaer.exe - detected as PE_PARITE.A
  • C:\bootwinlogan.exe
  • C:\snonsa.exe
  • C:\sslrvdaer.exe - detected as PE_PARITE.A
  • C:\stMUMA.exe
  • C:\stSB360.exe
  • C:\stsmss.exe

NOTES:

This Trojan requires the user name and password to successfully download the files.

  SOLUTION

Minimum Scan Engine:

9.750

FIRST VSAPI PATTERN FILE:

11.532.03

FIRST VSAPI PATTERN DATE:

11 Mar 2015

VSAPI OPR PATTERN File:

11.533.00

VSAPI OPR PATTERN Date:

12 Mar 2015

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Remove malware/grayware files dropped/downloaded by BAT_DLOAD.SMJ. (Note: Please skip this step if the threats listed below have already been removed.)

     
    • PE_PARITE.A

Step 4

Search and delete these files

[ Learn More ]
There may be some files that are 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.
  • C:\boot1.exe
  • C:\bootMarkNet32.exe
  • C:\bootnonsa.exe
  • C:\bootwinlogan.exe
  • C:\snonsa.exe
  • C:\stMUMA.exe
  • C:\stSB360.exe
  • C:\stsmss.exe

Step 5

Scan your computer with your Trend Micro product to delete files detected as BAT_DLOAD.SMJ. 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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