TROJ_BANKER.XXVF


 PLATFORM:

Windows

 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:

2,691,446 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

08 Nov 2014

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 drops the following copies of itself into the affected system:

  • %System%\wwtask.exe

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

It creates the following folders:

  • %Windows%\NetworkClient
  • %Windows%\NetworkClient\Temp
  • %Windows%\NetworkClient\Data
  • %Windows%\NetworkClient\Library
  • %Windows%\NetworkClient\Driver
  • %Windows%\NetworkClient\API
  • %Windows%\NetworkClient\Plugin

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\Tz0\
BIOS

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot\Minimal\
NetworkAgent

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\SafeBoot\Network\
NetworkAgent

HKEY_LOCAL_MACHINE\Software\Tz0\
BIOS

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Tz0\
BIOS
SMBiosType = "PHYSMEM"

HKEY_CURRENT_USER\Software\Tz0\
BIOS
SMBios = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_s = "109139122142134090"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_deb = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_sp = "092083117112098103093104112108117140146140141126134076075117"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_sn = "144144141122140132071126145126"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_mut = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_mutp = "092083117112098103093104112108117140146140141126134076075117"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_mutt = "073"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_mutx = "073"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_tray = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_usrt = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_afpdisable = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_otfedisable = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_awtaskdisable = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_fpreset = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\NetworkAgent
ImagePath = "%System%\wwtask.exe -service"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\NetworkAgent
Description = "Manages objects protocols in the Network and Dial-Up synchronizations"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\NetworkAgent
DisplayName = "Network Agent Driver Tz0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_dlt = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Tz0\
BIOS
SMBiosType = "PHYSMEM"

HKEY_LOCAL_MACHINE\SOFTWARE\Tz0\
BIOS
SMBios = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_p = "077076078082074"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_rport = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_pdie = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_max = "3e7"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_ui = "074"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_pcrypt = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_pon = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_up = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_lvv = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_lvf = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_gtimer = "14997"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_comp = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_recp = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_shadow = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_lb = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_lc = "2"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_exs = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_htm = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_fcnv = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_fct0 = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_secu = "074"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_sece = "069"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_sect = "6"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_secwa = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_secw = "4"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_secss = "511111111111100"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_fmhz = "96"

HKEY_LOCAL_MACHINE\SOFTWARE\Clients\
NetworkAgentDriver
t0_emhz = "0"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\~tmp11CE63C7D10B43688EA55D25F4223052.tmp
  • %User Temp%\~tmp58BE7B3CF4AC4945A5259E89B04B29BF.tmp
  • %Temp%\~tmp205D68D73E024052AEE16BFF99D280CA.tmp
  • %Temp%\~tmp0DC74D4E3DE24A7881779FA47CE2F6C7.tmp

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Temp% is the Windows temporary folder, where it usually is C:\Windows\Temp on all Windows operating system versions.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.700

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

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\Tz0
    • BIOS
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients
    • NetworkAgentDriver
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal
    • NetworkAgent
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot\Network
    • NetworkAgent
  • In HKEY_LOCAL_MACHINE\Software\Tz0
    • BIOS

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\Tz0\BIOS
    • SMBiosType = "PHYSMEM"
  • In HKEY_CURRENT_USER\Software\Tz0\BIOS
    • SMBios = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_s = "109139122142134090"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_deb = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_sp = "092083117112098103093104112108117140146140141126134076075117"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_sn = "144144141122140132071126145126"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_mut = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_mutp = "092083117112098103093104112108117140146140141126134076075117"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_mutt = "073"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_mutx = "073"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_tray = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_usrt = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_afpdisable = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_otfedisable = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_awtaskdisable = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_fpreset = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\NetworkAgent
    • ImagePath = "%System%\wwtask.exe -service"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\NetworkAgent
    • Description = "Manages objects protocols in the Network and Dial-Up synchronizations"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\NetworkAgent
    • DisplayName = "Network Agent Driver Tz0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_dlt = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Tz0\BIOS
    • SMBiosType = "PHYSMEM"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Tz0\BIOS
    • SMBios = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_p = "077076078082074"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_rport = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_pdie = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_max = "3e7"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_ui = "074"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_pcrypt = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_pon = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_up = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_lvv = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_lvf = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_gtimer = "14997"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_comp = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_recp = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_shadow = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_lb = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_lc = "2"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_exs = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_htm = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_fcnv = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_fct0 = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_secu = "074"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_sece = "069"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_sect = "6"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_secwa = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_secw = "4"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_secss = "511111111111100"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_fmhz = "96"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Clients\NetworkAgentDriver
    • t0_emhz = "0"

Step 4

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%\~tmp11CE63C7D10B43688EA55D25F4223052.tmp
  • %User Temp%\~tmp58BE7B3CF4AC4945A5259E89B04B29BF.tmp
  • %Temp%\~tmp205D68D73E024052AEE16BFF99D280CA.tmp
  • %Temp%\~tmp0DC74D4E3DE24A7881779FA47CE2F6C7.tmp

Step 5

Search and delete these folders

[ 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.
  • %Windows%\NetworkClient
  • %Windows%\NetworkClient\Temp
  • %Windows%\NetworkClient\Data
  • %Windows%\NetworkClient\Library
  • %Windows%\NetworkClient\Driver
  • %Windows%\NetworkClient\API
  • %Windows%\NetworkClient\Plugin

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_BANKER.XXVF. 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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