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TROJ_REVETON.IY

January 15, 2013
 Analysis by: Mark Joseph Manahan
 ALIASES:

TrojanDownloader:Win32/Cbeplay.P (Microsoft), PWS-Zbot.gen.aua (McAfee), a variant of Win32/Kryptik.ARZG 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:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet

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 connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

118,536 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

14 Jan 2013

Payload:

Displays graphics/image, Collects system information

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.

Autostart Technique

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

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
Update = "{Malware Path and Filename}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Update = "{Malware Path and Filename}"

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer
{random} = "{Hex Values}"

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot

Other Details

This Trojan connects to the following URL(s) to get the affected system's IP address:

  • http://www.ip-address.org/ip-checker.php

It connects to the following website to send and receive information:

  • {BLOCKED}.{BLOCKED}.86.137/index.php

NOTES:

It gathers the following information for its ransomware routine:

  • Malware Version and SubId
  • OS Version
  • System Default Language ID
  • System Metrics (Desktop width and height)
  • IP Address, Location and ISP

Using this information, it locks the screen and displays a notification window spoofing the Police Central e-Crime Unit, instructing the user to pay for alleged charges.

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.656.05

FIRST VSAPI PATTERN DATE:

15 Jan 2013

VSAPI OPR PATTERN File:

9.657.00

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

Restart in Safe Mode

[ Learn More ]

Step 3

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
    • Update = "{Malware Path and Filename}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer
    • {random} = "{Hex Values}"

Step 4

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