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TROJ_FAREIT.HR

January 28, 2013
 ALIASES:

PWS:Win32/Fareit.gen!I (Microsoft); W32.Qakbot (Symantec); Trojan-PSW.Win32.Tepfer.exhc (Kaspersky); Trojan.Win32.Winwebsec.mda (v) (Sunbelt); Trojan horse Crypt_s.AFX (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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

113,664 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

28 Jan 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:

  • %User Profile%\Application Data\Myki

(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.)

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%\Myki\xioti.exe"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\WinRAR

HKEY_CURRENT_USER\Software\Microsoft\
Ivyd

It adds the following registry entries:

HKEY_CURRENT_USER\Software\WinRAR
HWID = "{random values}"

HKEY_CURRENT_USER\Software\WinRAR
Client Hash = "{random values}"

HKEY_CURRENT_USER\Software\WinRAR
568152E2DCA76F1B7853BCC01DFCBF0F = "{random values}"

HKEY_CURRENT_USER\Software\WinRAR
D7472F030E6B08D9A25B007F00BA6BF6 = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Ivyd
52fhcbe = "ZPGi5vAL+R6HpuMU?_CHAR(0x05)_?"

HKEY_CURRENT_USER\Software\Microsoft\
Ivyd
63id2c = "H/HH5g==?"

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

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
29938:UDP = "29938:UDP:*:Enabled:UDP 29938"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
25078:TCP = "25078:TCP:*:Enabled:TCP 25078"

HKEY_CURRENT_USER\Software\Microsoft\
Ivyd
27b30c74 = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Ivyd
8gg3ifd = "{random characters}"

HKEY_CURRENT_USER\Software\Microsoft\
Ivyd
1835c81d = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Ivyd
1835c81d = "{random characters}"

HKEY_CURRENT_USER\Software\Microsoft\
Ivyd
8gg3ifd = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Ivyd
63id2c = "{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\
WAB\WAB4
OlkContactRefresh = "0"

HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
OlkFolderRefresh = "0"

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 {C0FE0177-5693-4537-9331-A7402AD82D40}.)

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.)

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\55531.exe
  • %User Temp%\59625.exe
  • %User Temp%\62093.exe
  • %User Profile%\Application Data\Myki
  • %User Profile%\Myki\xioti.exe
  • %Application Data%\ysohix.quo

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

Other Details

This Trojan deletes itself after execution.

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

Restart in Safe Mode

[ Learn More ]

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_CURRENT_USER\Software
    • WinRAR
  • In HKEY_CURRENT_USER\Software\Microsoft
    • Ivyd

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\Run
    • {58C4EBA0-47A8-AD40-8C85-A85A94978B48} = "%User Profile%\Myki\xioti.exe"
  • In HKEY_CURRENT_USER\Software\WinRAR
    • HWID = "{random values}"
  • In HKEY_CURRENT_USER\Software\WinRAR
    • Client Hash = "{random values}"
  • In HKEY_CURRENT_USER\Software\WinRAR
    • 568152E2DCA76F1B7853BCC01DFCBF0F = "{random values}"
  • In HKEY_CURRENT_USER\Software\WinRAR
    • D7472F030E6B08D9A25B007F00BA6BF6 = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Ivyd
    • 52fhcbe = "ZPGi5vAL+R6HpuMU?_CHAR(0x05)_?"
  • In HKEY_CURRENT_USER\Software\Microsoft\Ivyd
    • 63id2c = "H/HH5g==?"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
    • DisableNotifications = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
    • 29938:UDP = "29938:UDP:*:Enabled:UDP 29938"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
    • DisableNotifications = "0"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
    • 25078:TCP = "25078:TCP:*:Enabled:TCP 25078"
  • In HKEY_CURRENT_USER\Software\Microsoft\Ivyd
    • 27b30c74 = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Ivyd
    • 8gg3ifd = "{random characters}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Ivyd
    • 1835c81d = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Ivyd
    • 1835c81d = "{random characters}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Ivyd
    • 8gg3ifd = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Ivyd
    • 63id2c = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager
    • Server ID = "4"
  • In HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4
    • FirstRun = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4
    • OlkContactRefresh = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4
    • OlkFolderRefresh = "0"

Step 5

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Identities
    • From: Last Username = "Main Identity"
      To: Last Username = ""Main Identity""
  • In HKEY_CURRENT_USER\Identities
    • From: Last User ID = "{341F68BA-C841-4200-A7B4-3D5CFF202166}"
      To: Last User ID = ""{C0FE0177-5693-4537-9331-A7402AD82D40}""
  • In HKEY_CURRENT_USER\Identities
    • From: Identity Login = "9853"
      To: Identity Login = ""98053""
  • In HKEY_CURRENT_USER\Identities
    • From: Identity Ordinal = "2"
      To: Identity Ordinal = ""1""

Step 6

Search and delete these components

[ Learn More ]
There may be some components 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.
  • %User Temp%\55531.exe
  • %User Temp%\59625.exe
  • %User Temp%\62093.exe
  • %User Profile%\Application Data\Myki
  • %User Profile%\Myki\xioti.exe
  • %Application Data%\ysohix.quo

Step 7

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.
  • %User Profile%\Application Data\Myki

Step 8

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