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TROJ_CRYPTRAR.A

June 14, 2014
 Analysis by: Mark Joseph Manahan
 ALIASES:

W32/Agent.ICJ!tr, [moar.exe]:W32/Agent.ICJ!tr (Fortinet) ,W32/Heuristic-210!Eldorado (not disinfectable) (Fprot) ,RiskTool.Win32.Crypter.hq (Kaspersky) ,multiple threats, Win32/Filecoder.NBR trojan, Win32/Filecoder.NBR trojan, Win32/Filecoder.NBU trojan, Win32/Filecoder.NBR trojan, Win32/Filecoder.NBR trojan (Eset)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • 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.

  TECHNICAL DETAILS

File Size:

470,606 bytes

File Type:

EXE

Initial Samples Received Date:

05 Jun 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.

Installation

This Trojan drops the following files:

  • %System Root%\tmp\bm.cmd
  • %System Root%\tmp\bmrsa.exe
  • %System Root%\tmp\driver.bat
  • %System Root%\tmp\drv.bat
  • %System Root%\tmp\moar.exe
  • %System Root%\tmp\public.cod
  • %System Root%\tmp\Rar.exe
  • %System Root%\tmp\strt.exe
  • %System Root%\tmp\testz

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It drops and executes the following files:

  • %System Root%\tmp\zap.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)

It creates the following folders:

  • %System Root%\tmp

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)