ALIASES:

TrojanDownloader:Win32/Banload (Microsoft); RDN/Generic.bfr!im (McAfee); Trojan.Gen.2 (Symantec); Trojan.Win32.DelfInject.vjq (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Downloader.Banload2.ADXH (AVG)

 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: 488,563 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 11 Jul 2015

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%\Microsoft\windowsphone

(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.)

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\ByConect

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
G_VP = "69C553D03ECA"

HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
G_L_Mod = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
G_L_Str = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
G_L_A = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
G_L_AU = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
G_L_CF = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
G_L_P_L = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
G_L_P_P = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
G_L_P_R = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
G_L_Com = "{random characters}"

HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
G_run = "%User Profile%\windowsphone\app01"

Dropping Routine

This Trojan drops the following files:

  • %Program Files%\trvlfev.tmp
  • %User Profile%\windowsphone\app02
  • %User Profile%\windowsphone\app01
  • %User Profile%\windowsphone\app03
  • %User Profile%\windowsphone\apps
  • %User Startup%\comic.exe

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.. %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.. %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://cancelierseguros.{BLOCKED}m.br/images/modu/app01
  • http://cancelierseguros.{BLOCKED}m.br/images/modu/app02
  • http://cancelierseguros.{BLOCKED}m.br/images/modu/app03
  • http://cancelierseguros.{BLOCKED}m.br/images/start/st11.pdf
  • {BLOCKED}0.1
  • {BLOCKED}4.130.238
  • {BLOCKED}.228.248

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.750

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_LOCAL_MACHINE\Software
    • ByConect

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_LOCAL_MACHINE\SOFTWARE\ByConect
    • G_VP = "69C553D03ECA"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
    • G_L_Mod = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
    • G_L_Str = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
    • G_L_A = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
    • G_L_AU = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
    • G_L_CF = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
    • G_L_P_L = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
    • G_L_P_P = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
    • G_L_P_R = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
    • G_L_Com = "{random characters}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ByConect
    • G_run = "%User Profile%\windowsphone\app01"

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.
  • %Program Files%\trvlfev.tmp
  • %User Profile%\windowsphone\app02
  • %User Profile%\windowsphone\app01
  • %User Profile%\windowsphone\app03
  • %User Profile%\windowsphone\apps
  • %User Startup%\comic.exe

Step 5

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%\Microsoft\windowsphone

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_BANLOAD.JPI. 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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