Analysis by: Anthony Joe Melgarejo
ALIASES:

Trojan:WinNT/Rortiem.A (Microsoft), Backdoor.Straxbot (Symantec)

 PLATFORM:

Windows

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

  • Threat Type: Rootkit

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This rootkit 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: 102,528 bytes
Initial Samples Received Date: 25 Nov 2015

Arrival Details

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

Dropping Routine

This rootkit drops the following files:

  • %Temp%\{random file name 3}.bin
  • %Temp%\{random file name 1}.temp
  • %Windows%\Installer\{GUID}\{random file name 2}.bin

(Note: %Temp% is the Windows temporary folder, where it usually is C:\Windows\Temp on all Windows operating system versions.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

Other Details

This rootkit connects to the following possibly malicious URL:

  • {BLOCKED}.{BLOCKED}.237.22/robots.txt