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BKDR_LUMINOSITY.AUSIMJ

April 18, 2017
 Analysis by: Jennifer Gumban
 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

  TECHNICAL DETAILS

File Size:

1,110,016 bytes

File Type:

EXE

Initial Samples Received Date:

13 Apr 2017

Arrival Details

This Backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Installation

This Backdoor drops the following files:

  • %Application Data%\Microsoft\Windows\ScreenToGif\yjakou.lnk

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.)

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

  • %Application Data%\Microsoft\Windows\ScreenToGif\yjakou.exe

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.)

It creates the following folders:

  • %Application Data%\Microsoft\Windows\ScreenToGif
  • %Application Data%\Monitor
  • %Application Data%\Monitor\Files
  • %Application Data%\Monitor\Guard
  • %Application Data%\Monitor\Logs
  • %Application Data%\Monitor\Screenshots

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.)

Autostart Technique

This Backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Windows
Load = "%Application Data%\Microsoft\Windows\ScreenToGif\yjakou.lnk"

Other System Modifications

This Backdoor adds the following registry entries:

HKEY_CURRENT_USER\Software
lCPSo6c6sxtRRMHq4KmrEg== = "1Cs03RR7x8W4+sULBFel3E3gs+3L9KIqsgIgGKGBIXc="

HKEY_CURRENT_USER\Software
i1VDgAj386NT5axSyn0WYA== = "fZpQGc3gQ0KVfFuVg/luQg=="

HKEY_CURRENT_USER\Software
PTH = "%Application Data%\Microsoft\Windows\ScreenToGif\yjakou.exe"

HKEY_CURRENT_USER\Software
MTX = "{value}"

HKEY_CURRENT_USER\Software
PRC = "{numbers}"

Other Details

This Backdoor connects to the following possibly malicious URL:

  • {BLOCKED}.{BLOCKED}.247.208