Analysis by: Jimelle Monteser
ALIASES:

Trojan.Win32.Redyms.pxh (Kaspersky), Trojan.Win32.Generic!BT (Sunbelt)

 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.

It deletes the initially executed copy of itself.

  TECHNICAL DETAILS

File Size: 279,040 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 20 Jul 2013

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 copies of itself into the affected system:

  • %AppDataLocal%\{random folder name}\ceafabcbeabeaad.exe

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local on Windows Vista and 7.)

It creates the following folders:

  • %AppDataLocal%\{random folder name}

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local on Windows Vista and 7.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
{random folder name} = "%AppDataLocal%\{random folder name}\ceafabcbeabeaad.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Adobe CSS5.1 Manager = "%AppDataLocal%\{random folder name}\ceafabcbeabeaad.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
Adobe CSS5.1 Manager = "%AppDataLocal%\{random folder name}\ceafabcbeabeaad.exe"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Adobe

HKEY_CURRENT_USER\Software\Adobe\
CSXS.2.5

HKEY_CURRENT_USER\Software\Microsoft\
CurrentVersion\Policies\Explorer\
Run

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Adobe\
CSXS.2.5
bProofingSpace = "{hex values}"

Dropping Routine

This Trojan drops the following files:

  • %Windows%\Task\{random}.job

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

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}kuuyssk.org

It deletes the initially executed copy of itself