BKDR_CAPHAW.YY

May 30, 2014
 Analysis by: Mark Joseph Manahan
 ALIASES:

a variant of Win32/Kryptik.CCJM 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: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Propagates via removable drives, Propagates via instant messaging applications

This backdoor 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 commands from a remote malicious user, effectively compromising the affected system.

It also has rootkit capabilities, which enables it to hide its processes and files from the user.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

634,880 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

27 May 2014

Payload:

Connects to URLs/IPs, Compromises system security

Arrival Details

This backdoor 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 backdoor drops the following copies of itself into the affected system and executes them:

  • %Application Data%\{random folder found}\{filename found in %System%}

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random base64 chars} = "%Application Data%\{random folder found}\{filename found in %System%}"

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

  • Remote Desktop / Remote Access
  • Download & Upload Files
         DownloadLink:{domain}/files/rar.exe
  • Update And Uninstall self
  • Download and Load Additional Plugins
         {domain}/files/010-update-qoel9c5ce/hidden7170777.jpg
         {domain}/files/010-update-qoel9c5ce/UK-3_xcv.jpg
  • Redirect network traffic
  • Monitor Browser Activity

Rootkit Capabilities

This backdoor also has rootkit capabilities, which enables it to hide its processes and files from the user.

Information Theft

This backdoor gathers the following data:

  • Installed Applications
  • Directory and File List
  • Drive Information
  • Network Information
  • User name
  • Computer name
  • OS Version
  • Hardware Information
  • Running Processes

Other Details

This backdoor connects to the following website to send and receive information:

  • https://{BLOCKED}fe.cc
  • https://{BLOCKED}neinc-inc.net
  • https://{BLOCKED}pingllc.org
  • https://{BLOCKED}shipping.org
  • https://{BLOCKED}to.su/index.php
  • https://{BLOCKED}iceshippinginc.net
  • https://{BLOCKED}a.su/index.php
  • https://{BLOCKED}hip-llc.net
  • https://{BLOCKED}9.{BLOCKED}7.42.183
  • https://{BLOCKED}2.{BLOCKED}7.48.11
  • https://{BLOCKED}9.{BLOCKED}9.83.153
  •      Gateway URIs: '/index.php' | '/www5/index.php'

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.822.08

FIRST VSAPI PATTERN DATE:

27 May 2014

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product and note files detected as BKDR_CAPHAW.YY

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {random base64 chars} = "%Application Data%\{random folder found}\{filename found in %System%}"

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_CAPHAW.YY. 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.


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