WORM_PHULLI.B

July 03, 2018
 Analysis by: Kiyoshi Obuchi
 ALIASES:

Trojan.Luminrat (Symantec) ; Mal/MSIL-TH (Sophos)

 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Worm 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:

2,202,584 bytes

File Type:

EXE

Initial Samples Received Date:

31 Mar 2017

Arrival Details

This Worm 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 Worm drops the following files:

  • %All Users Profile%\Microsoft\RAC\StateData\RacWmiDataBookmarks.dat
  • %All Users Profile%\Microsoft\RAC\StateData\RacWmiEventData.dat
  • %AppDataLocal%Low\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015
  • %Application Data%\conhost\Guard\1
  • %Application Data%\conhost\Screenshots\{DATE}\{TIME}
  • %Application Data%\hawkeye.exe
  • %Application Data%\rat.exe
  • %Application Data%\svchost.exe
  • %Application Data%\Windows Update.exe
  • %Program Files%\Client\svchost.exe
  • %System%\clientmonitor.exe
  • %System%\Tasks\adorbe
  • %User Temp%\1934
  • %User Temp%\3742
  • %User Temp%\3919
  • %User Temp%\4445
  • %User Temp%\5185
  • %User Temp%\7635
  • %User Temp%\8280
  • %User Temp%\8856
  • %Windows%\Temp\fwtsqmfile01.sqm
  • %User Startup%\BGInfo.lnk
  • %Application Data%\conhost\Logs\07-03-2018
  • {Removable Drive}\autorun.inf
  • {Removable Drive}\Sys.exe

(Note: %All Users Profile% is the All Users folder, where it usually is C:\Documents and Settings\All Users on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\ProgramData 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.. %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local 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.. %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.. %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.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %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.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

It creates the following folders:

  • %Application Data%\conhost\Logs
  • %Application Data%\conhost\Files
  • %Application Data%\conhost\Screenshot
  • %Application Data%\conhost\Guard

(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.)

Other System Modifications

This Worm adds the following registry entries:

HKEY_CURRENT_USER\Software
PTH = "%Program Files%\Client\svchost.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows NT\CurrentVersion\Winlogon
shell = "explorer.exe,"%System%\clientmonitor.exe""

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Schedule\
TaskCache\Tree\adorbe
Index = "3"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunOnce
adorbe = "cmd /c "start "adorbe" "%Program Files%\Client\svchost.exe""

Other Details

This Worm connects to the following possibly malicious URL:

  • enugu0421.{BLOCKED}s.net
  • s.{BLOCKED}d.com
  • sw.{BLOCKED}d.com
  • s.{BLOCKED}b.com
  • sw.{BLOCKED}b.com
  • s2.{BLOCKED}b.com
  • s1.{BLOCKED}b.com
  • sv.{BLOCKED}d.com
  • sv.{BLOCKED}b.com
  • ss.{BLOCKED}d.com
  • gn.{BLOCKED}d.com

It adds the following scheduled tasks:

    • Name: adorbe
    • Trigger: on startup
    • Executes: Program Files%\Client\svchost.exe