Analysis by: Anthony Joe Melgarejo

 PLATFORM:

Linux, UNIX, Mac OS X

 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: 129 bytes
File Type: Script
Memory Resident: No
Initial Samples Received Date: 06 Oct 2014

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 connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}.{BLOCKED}.100.170/manual/a.c

It saves the files it downloads using the following names:

  • /tmp/a.c - detected as TROJ_KAITEN.A

NOTES:

/tmp/a.c is a C source file.

This malware will compile the source file using GNU C Compiler (GCC) and save the compile binary as /tmp/.a - detected as ELF_KAITEN.SM.

Then, it will execute the compiled binary. As a result, malicious behavior are exhibited in the system.

It will perform self cleanup by deleting /tmp/.a.

  SOLUTION

Minimum Scan Engine: 9.700

Step 1

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

    • TROJ_KAITEN.A

Step 2

Scan your computer with your Trend Micro product to delete files detected as UNIX_BASHKAI.B. 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.

NOTES:

Please perform this as Step 1 of the solution:

Remove malware/grayware files created upon compilation of TROJ_KAITEN.A. (Note: Please skip this step if the threats listed below have already been removed.)

  • ELF_KAITEN.SM


Did this description help? Tell us how we did.