TROJ_JORIK.ENK

June 06, 2013

ALIASES:

TrojanDownloader:Win32/Small (Microsoft); Trojan.Win32.Jorik.Banload.cf (Kaspersky); Trojan horse Downloader.Banload.CNOE (AVG)

PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

OVERALL RISK RATING:

DAMAGE POTENTIAL:

DISTRIBUTION POTENTIAL:

REPORTED INFECTION:

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: 126,976 bytes

File Type: EXE

Memory Resident: No

Initial Samples Received Date: 06 Jun 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 creates the following folders:

%System Root%\skype64x

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

Autostart Technique

This Trojan registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{F5D1102F-B565-4F43-A465-70BA5030E5F2}

Other System Modifications

This Trojan deletes the following files:

%System Root%\skype64x\fpsk1611DesBananaeD

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

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
explorer

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Policies\System

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
Ext\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}\1.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}\1.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}\1.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}\1.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}\1.0\
HELPDIR

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{A4502BF0-AEAD-4CD6-A320-84B38D29FC17}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{A4502BF0-AEAD-4CD6-A320-84B38D29FC17}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{A4502BF0-AEAD-4CD6-A320-84B38D29FC17}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{A4502BF0-AEAD-4CD6-A320-84B38D29FC17}\TypeLib

HKEY_CLASSES_ROOT\CLSID\{F5D1102F-B565-4F43-A465-70BA5030E5F2}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F5D1102F-B565-4F43-A465-70BA5030E5F2}\InprocServer32

HKEY_CLASSES_ROOT\NewSkype64.ClsNewSkype64

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
explorer
Publish = "Version64x"

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\
Microsoft\Windows\CurrentVersion\
Policies\System
EnableLUA = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Ext\CLSID
{F5D1102F-B565-4F43-A465-70BA5030E5F2} = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{A4502BF0-AEAD-4CD6-A320-84B38D29FC17}\TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F5D1102F-B565-4F43-A465-70BA5030E5F2}
ProgID = "NewSkype64.ClsNewSkype64"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F5D1102F-B565-4F43-A465-70BA5030E5F2}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F5D1102F-B565-4F43-A465-70BA5030E5F2}
TypeLib = "{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{F5D1102F-B565-4F43-A465-70BA5030E5F2}
VERSION = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
NewSkype64.ClsNewSkype64
Clsid = "{F5D1102F-B565-4F43-A465-70BA5030E5F2}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{A4502BF0-AEAD-4CD6-A320-84B38D29FC17}
ProxyStubClsid = "{00020424-0000-0000-C000-000000000046}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{A4502BF0-AEAD-4CD6-A320-84B38D29FC17}
ProxyStubClsid32 = "{00020424-0000-0000-C000-000000000046}"

Dropping Routine

This Trojan drops the following files:

%System Root%\skype64x\fpsk1611.dll

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

Other Details

This Trojan connects to the following possibly malicious URL:

http://silttac.{BLOCKED}7.f1.k8.com.br/mamore3.jpg
http://flavios-drinks.{BLOCKED}1.f1.k8.com.br/mirela/recept.php
http://omamore.{BLOCKED}m.br/mirela2/recept.php

This report is generated via an automated analysis system.

SOLUTION

Minimum Scan Engine: 9.300

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

Close all opened browser windows

Step 3

Delete this registry key

[ 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_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion
- explorer

In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Policies
- System

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Ext
- CLSID

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
- {F5489FBC-5531-4CFB-95CC-07A3AB7A4240}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}
- 1.0

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}\1.0
- FLAGS

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}\1.0
- 0

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}\1.0\0
- win32

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}\1.0
- HELPDIR

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
- {A4502BF0-AEAD-4CD6-A320-84B38D29FC17}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{A4502BF0-AEAD-4CD6-A320-84B38D29FC17}
- ProxyStubClsid

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{A4502BF0-AEAD-4CD6-A320-84B38D29FC17}
- ProxyStubClsid32

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{A4502BF0-AEAD-4CD6-A320-84B38D29FC17}
- TypeLib

In HKEY_CLASSES_ROOT\CLSID
- {F5D1102F-B565-4F43-A465-70BA5030E5F2}

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F5D1102F-B565-4F43-A465-70BA5030E5F2}
- InprocServer32

In HKEY_CLASSES_ROOT
- NewSkype64.ClsNewSkype64

To delete the registry key this malware/grayware created:

Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Wow6432Node>Microsoft>Windows>CurrentVersion
Still in the left panel, locate and delete the key:
explorer
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Wow6432Node>Microsoft>Windows>CurrentVersion>Policies
Still in the left panel, locate and delete the key:
System
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>Policies>Ext
Still in the left panel, locate and delete the key:
CLSID
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>TypeLib
Still in the left panel, locate and delete the key:
{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>TypeLib>{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}
Still in the left panel, locate and delete the key:
1.0
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>TypeLib>{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}>1.0
Still in the left panel, locate and delete the key:
FLAGS
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>TypeLib>{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}>1.0>0
Still in the left panel, locate and delete the key:
win32
Again Still in the left panel, locate and delete the key:
HELPDIR
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Interface
Still in the left panel, locate and delete the key:
{A4502BF0-AEAD-4CD6-A320-84B38D29FC17}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Interface>{A4502BF0-AEAD-4CD6-A320-84B38D29FC17}
Still in the left panel, locate and delete the key:
ProxyStubClsid
Again Still in the left panel, locate and delete the key:
ProxyStubClsid32
Again Still in the left panel, locate and delete the key:
TypeLib
In the left panel, double-click the following:
HKEY_CLASSES_ROOT>CLSID
Still in the left panel, locate and delete the key:
{F5D1102F-B565-4F43-A465-70BA5030E5F2}
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{F5D1102F-B565-4F43-A465-70BA5030E5F2}
Still in the left panel, locate and delete the key:
InprocServer32
In the left panel, double-click the following:
HKEY_CLASSES_ROOT
Still in the left panel, locate and delete the key:
NewSkype64.ClsNewSkype64
Close Registry Editor.

Step 4

Delete this registry value

[ Learn More ]

In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\explorer
- Publish = "Version64x"

In HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Policies\System
- EnableLUA = "0"

In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Ext\CLSID
- {F5D1102F-B565-4F43-A465-70BA5030E5F2} = "1"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{A4502BF0-AEAD-4CD6-A320-84B38D29FC17}\TypeLib
- Version = "1.0"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F5D1102F-B565-4F43-A465-70BA5030E5F2}
- ProgID = "NewSkype64.ClsNewSkype64"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F5D1102F-B565-4F43-A465-70BA5030E5F2}\InprocServer32
- ThreadingModel = "Apartment"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F5D1102F-B565-4F43-A465-70BA5030E5F2}
- TypeLib = "{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{F5D1102F-B565-4F43-A465-70BA5030E5F2}
- VERSION = "1.0"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\NewSkype64.ClsNewSkype64
- Clsid = "{F5D1102F-B565-4F43-A465-70BA5030E5F2}"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{A4502BF0-AEAD-4CD6-A320-84B38D29FC17}
- ProxyStubClsid = "{00020424-0000-0000-C000-000000000046}"

In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{A4502BF0-AEAD-4CD6-A320-84B38D29FC17}
- ProxyStubClsid32 = "{00020424-0000-0000-C000-000000000046}"

To delete the registry value this malware/grayware created:

Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Wow6432Node>Microsoft>Windows>CurrentVersion>explorer
In the right panel, locate and delete the entry:
Publish = "Version64x"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Wow6432Node>Microsoft>Windows>CurrentVersion>Policies>System
In the right panel, locate and delete the entry:
EnableLUA = "0"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>Windows>CurrentVersion>policies>Ext>CLSID
In the right panel, locate and delete the entry:
{F5D1102F-B565-4F43-A465-70BA5030E5F2} = "1"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Interface>{A4502BF0-AEAD-4CD6-A320-84B38D29FC17}>TypeLib
In the right panel, locate and delete the entry:
Version = "1.0"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{F5D1102F-B565-4F43-A465-70BA5030E5F2}
In the right panel, locate and delete the entry:
ProgID = "NewSkype64.ClsNewSkype64"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>CLSID>{F5D1102F-B565-4F43-A465-70BA5030E5F2}>InprocServer32
In the right panel, locate and delete the entry:
ThreadingModel = "Apartment"
Again In the right panel, locate and delete the entry:
TypeLib = "{F5489FBC-5531-4CFB-95CC-07A3AB7A4240}"
Again In the right panel, locate and delete the entry:
VERSION = "1.0"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>NewSkype64.ClsNewSkype64
In the right panel, locate and delete the entry:
Clsid = "{F5D1102F-B565-4F43-A465-70BA5030E5F2}"
In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Classes>Interface>{A4502BF0-AEAD-4CD6-A320-84B38D29FC17}
In the right panel, locate and delete the entry:
ProxyStubClsid = "{00020424-0000-0000-C000-000000000046}"
Again In the right panel, locate and delete the entry:
ProxyStubClsid32 = "{00020424-0000-0000-C000-000000000046}"
Close Registry Editor.

Step 5

Search and delete this file

[ Learn More ]

There may be some files that are 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.

%System Root%\skype64x\fpsk1611.dll

Step 6

Search and delete this folder

[ Learn More ]

Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.

%System Root%\skype64x

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_JORIK.ENK. 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.

Step 8

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

%System Root%\skype64x\fpsk1611DesBananaeD

Did this description help? Tell us how we did.

TROJ_JORIK.ENK

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Resources

Support

About Trend

Country Headquarters