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

Tamaño del archivo 102,528 bytes
Fecha de recepción de las muestras iniciales 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