TROJ_INJECTO.BTR

October 08, 2013
 Analysis by: Alvin Bacani
 ALIASES:

VirTool:Win32/DelfInject.gen!BI (Microsoft); Trojan.Win32.Agent.acbak (Kaspersky); Win32/Spy.Banker.AADS (ESET-NOD32)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet

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:

1,553,408 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

07 Oct 2013

Payload:

Connects to URLs/IPs

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 file(s)/component(s):

  • %System%\drivers\AcpiPmie.sys - detected as TROJ_BANKER.JWL
  • %System%\drivers\adpchci.sys - detected as TROJ_BANKER.JWV

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It drops the following copies of itself into the affected system:

  • %Application Data%\Java Update\jusched.exe

(Note: %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.)

It creates the following folders:

  • %Application Data%\Java Update

(Note: %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.)

It injects itself into the following processes as part of its memory residency routine:

  • iexplore.exe

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
Java(TM)Platform SE Auto Updater Safe Mode = ""%Application Data%\Java Update\jusched.exe""

It registers its dropped component as a system service to ensure its automatic execution at every system startup. It does this by creating the following registry entries:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\AcpiPmie
DisplayName = "AcpiPmie"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\AcpiPmie
Group = "File System"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\AcpiPmie
ErrorControl = "01"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\AcpiPmie
ImagePath = "%System%\drivers\AcpiPmie.sys"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\AcpiPmie
Start = "0"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\AcpiPmie
Type = "01"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\adpchci
DisplayName = "adpchci"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\adpchci
ErrorControl = "1"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\adpchci
ImagePath = %System%\drivers\adpchci.sys

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\adpchci
Type = "01"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\adpchci
Start = "0"

Other System Modifications

This Trojan adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Associations
LowRiskFileTypes = ".exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
EnableLUA = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
ConsentPromptBehaviorAdmin = "0"

It adds the following registry keys as part of its installation routine:

HKEY_CURRENT_USER\Software\WinBlock\
wefdse

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • seras2.{BLOCKED}s.net

NOTES:

This Trojan pretends that it is a Java installer by connecting to the URL to the URL http://javadl.sun.com/webapps/download/AutoDL?BundleId=76867 to download a true Java installer. It drops and execute the downloaded installer as %User Temp%\Java7u30_update.exe.

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

10.326.08

FIRST VSAPI PATTERN DATE:

07 Oct 2013

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

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.  
  • %Application Data%\Java Update\jusched.exe
  • %System%\drivers\AcpiPmie.sys
  • %System%\drivers\adpchci.sys

Step 4

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.
  • %Application Data%\Java Update

Step 5

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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

  • In HKEY_CURRENT_USER\Software\WinBlock
    • wefdse
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • AcpiPmie
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
    • adpchci

Step 6

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
    • Java(TM)Platform SE Auto Updater Safe Mode = ""%Application Data%\Java Update\jusched.exe""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Associations
    • LowRiskFileTypes = ".exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
    • EnableLUA = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
    • ConsentPromptBehaviorAdmin = "0"

Step 7

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