TROJ_JORIK.PAO

May 29, 2013
 Modified by: Anthony Joe Melgarejo
 ALIASES:

TrojanDownloader:Win32/Cutwail.BT (Microsoft), Trojan.ADH (Symantec), Generic BackDoor.u (McAfee), Trojan.Win32.Jorik.Totem.nx (Kaspersky), Trojan.Win32.Generic!BT (Sunbelt)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Spammed via email

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It does not have any propagation routine.

It does not have any backdoor routine.

It does not have any information-stealing capability.

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size:

20928 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

11 Jul 2012

Payload:

Connects to URLs/IPs, Sends messages

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Installation

This Trojan drops the following copies of itself into the affected system:

  • %User Profile%\kyupecv03c.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

It adds the following processes:

  • svchost.exe

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • kyupecv03c
  • kpoqt61099

It injects itself into the following processes as part of its memory residency routine:

  • previously created svchost.exe

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\Run
femokybhawam = "%User Profile%\kyupecv03c.exe"

Other System Modifications

This Trojan adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
kyupecv03c = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSetServices\
Tcpip\Parameters
MaxUserPort = "0x0000fffe (65534)"

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Information Theft

This Trojan does not have any information-stealing capability.

Other Details

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

  • {BLOCKED}r.com
  • {BLOCKED}at.com
  • {BLOCKED}lj.com
  • {BLOCKED}a.com
  • {BLOCKED}mcy.com
  • {BLOCKED}dk.com

NOTES:

This Trojan downloads arbitrary files from links provided by the above mentioned remote sites.

This Trojan may compose messages that can be part of its spamming routine. The messages it sends contain the following links:

  • www.microsoft.com
  • www.perl.org
  • www.xxx.de

It uses any of the following Simple Mail Transfer Protocol (SMTP) servers to send its messages:

  • {BLOCKED}4.gmail-smtp-in.l.google.com
  • {BLOCKED}tp-in.l.google.com
  • {BLOCKED}1.smtp.messagingengine.com
  • {BLOCKED}7.digitalwaves.co.nz
  • {BLOCKED}s.mail.ru

It does not have rootkit capabilities.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.284.07

FIRST VSAPI PATTERN DATE:

11 Jul 2012

VSAPI OPR PATTERN File:

9.285.00

VSAPI OPR PATTERN Date:

12 Jul 2012

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 TROJ_JORIK.PAO

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
    • kyupecv03c = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • kyupecv03c = "%User Profile%\kyupecv03c.exe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
    • MaxUserPort = "0x0000fffe (65534)"

Step 5

Search and delete the files detected as TROJ_JORIK.PAO

*Note: Some component files may be hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.

To stop the malware/grayware from running when certain files are opened:

For Windows 2000, Windows XP, and Windows Server 2003:

  1. Right-click Start then click Search....
  2. In the Named input box, type the name of the file that was detected earlier.
  3. In the Look In drop-down list, select My Computer then press Enter.
  4. Once located, select the file then press SHIFT+DELETE to delete it.

For Windows Vista and Windows 7:

  1. Click Start>Computer.
  2. In the Search Computer input box, type the name of the file detected earlier, and press Enter.
  3. Once located, select the file then press SHIFT+DELETE to delete it.
    *Note: Read the following Microsoft page if these steps do not work on Windows 7.

Step 6

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