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TrojanSpy.Win32.KEYLOG.AF

January 09, 2020
 ALIASES:

RDN/Generic PWS.y (McAfee); Trojan.Win32.Generic!BT (Sunbelt)

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan Spy 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:

724,992 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

09 Jan 2020

Arrival Details

This Trojan Spy 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 Spy adds the following processes:

  • cmd.exe /c %User Temp%\NewBitmapImage.bmp
  • %User Startup%\frqzxach.exe
  • %User Temp%\NewBitmapImage.bmp %User Temp%\NewBitmapImage.bmp
  • %User Temp%\NewBitmapImage.bmp

(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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %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, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)

Autostart Technique

This Trojan Spy drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

  • %User Startup%\frqzxach.exe

(Note: %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, C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows 2003(32-bit), XP and 2000(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit), 10(64-bit).)

Other System Modifications

This Trojan Spy adds the following registry keys:

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Temp%\namebro

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Temp%\Text1

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Startup%\namebro

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Startup%\vbnbnbv

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Startup%\bnnbnvvn

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Startup%\tyrggg

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Startup%\qwwwweeee

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Startup%\iouyutr

It adds the following registry entries:

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Temp%\namebro
namebro = "frqzxach"

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Temp%\Text1
Text1 = ""

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Temp%\Text1
Text1 = "4"

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Temp%\Text1
Text1 = "59"

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Temp%\Text1
Text1 = "0"

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Temp%\Text1
Text1 = "perwa{computername}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Shell Extensions\
Cached
{random string} = "\x01\x00\x00\x00\x00\x00\x00\x00l\x06\xa3\xb2L\xd5\x01"

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Startup%\namebro
namebro = "qeagsxch"

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Startup%\vbnbnbv
vbnbnbv = ""

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Startup%\bnnbnvvn
bnnbnvvn = "4"

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Startup%\tyrggg
tyrggg = "59"

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Startup%\qwwwweeee
qwwwweeee = "0"

HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
%User Startup%\iouyutr
iouyutr = "perwa{computername}"

Dropping Routine

This Trojan Spy drops the following files:

  • %User Temp%\NewBitmapImage.bmp

(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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other Details

This Trojan Spy connects to the following possibly malicious URL:

  • {BLOCKED}3.153.8

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.850

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Restart in Safe Mode

[ Learn More ]

Step 3

Identify and terminate files detected as TrojanSpy.Win32.KEYLOG.AF

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 4

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\VB and VBA Program Settings\%User Temp%
    • namebro
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Temp%
    • Text1
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Startup%
    • namebro
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Startup%
    • vbnbnbv
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Startup%
    • bnnbnvvn
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Startup%
    • tyrggg
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Startup%
    • qwwwweeee
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Startup%
    • iouyutr

Step 5

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\VB and VBA Program Settings\%User Temp%\namebro
    • namebro = "frqzxach"
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Temp%\Text1
    • Text1 = ""
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Temp%\Text1
    • Text1 = "4"
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Temp%\Text1
    • Text1 = "59"
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Temp%\Text1
    • Text1 = "0"
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Temp%\Text1
    • Text1 = "perwa{computername}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Cached
    • {random string} = "\x01\x00\x00\x00\x00\x00\x00\x00l\x06\xa3\xb2L\xd5\x01"
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Startup%\namebro
    • namebro = "qeagsxch"
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Startup%\vbnbnbv
    • vbnbnbv = ""
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Startup%\bnnbnvvn
    • bnnbnvvn = "4"
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Startup%\tyrggg
    • tyrggg = "59"
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Startup%\qwwwweeee
    • qwwwweeee = "0"
  • In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\%User Startup%\iouyutr
    • iouyutr = "perwa{computername}"

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%\NewBitmapImage.bmp

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TrojanSpy.Win32.KEYLOG.AF. 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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