TROJ_JORIK.BFN

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.

File Size:

188,928 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

04 Nov 2011

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:

%User Profile%\Application Data\Evyf
%User Profile%\Application Data\Gonaa

(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)

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
{58C4EBA0-47A8-AD40-8C85-A85A94978B48} = ""%User Profile%\Evyf\agfuy.exe""

It registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Ihohv

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Privacy

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Ihohv
1hch19ch = "dZusTsNG+ASkeWx/ZTbSipPI4rZqsrXc? ?"

HKEY_CURRENT_USER\Software\Microsoft\
Ihohv
21417d8f = {random values}

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = 1

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
26956:UDP = "26956:UDP:*:Enabled:UDP 26956"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
20982:TCP = "20982:TCP:*:Enabled:TCP 20982"

HKEY_CURRENT_USER\Software\Microsoft\
Ihohv
ah28agb = {random values}

HKEY_CURRENT_USER\Software\Microsoft\
Ihohv
29ee6542 = "GJvNTrsKMUpgNEtTzU8n6l+/Nt5bI2/PI7eOS8PaPy+2OTeYES4qyNqHIp/ICq0f7NS42Vk/0AE=?_CHAR(0x14)_?"

HKEY_CURRENT_USER\Software\Microsoft\
Ihohv
1j8b7hb7 = {random values}

HKEY_CURRENT_USER\Software\Microsoft\
Ihohv
fgb93a0 = {random values}

HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager
Server ID = 4

HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
FirstRun = 1

HKEY_CURRENT_USER\Software\Microsoft\
Ihohv
21417d8f = "SZvNTg==_CHAR(0x07)__CHAR(0x03)_l_CHAR(0x0E)_"

It modifies the following registry entries:

HKEY_CURRENT_USER\Identities
Last Username = "Main Identity"

(Note: The default value data of the said registry entry is Main Identity.)

HKEY_CURRENT_USER\Identities
Last User ID = "{341F68BA-C841-4200-A7B4-3D5CFF202166}"

(Note: The default value data of the said registry entry is {5D1D9894-914A-4AF9-BD82-81F349A83013}.)

HKEY_CURRENT_USER\Identities
Identity Login = 9853

(Note: The default value data of the said registry entry is 98053.)

HKEY_CURRENT_USER\Identities
Identity Ordinal = 2

(Note: The default value data of the said registry entry is 1.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
WBEM\WDM
%System%\advapi32.dll[MofResourceName] = "LowDateTime:-878345984,HighDateTime:29653303***Binary mof compiled successfully"