Trojan.MSIL.NANOBOT.K

May 08, 2024
 Analysis by: John Rainier Navato
 ALIASES:

UDS:Backdoor.MSIL.NanoBot.gen (KASPERSKY)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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:

238,400 bytes

File Type:

EXE

Initial Samples Received Date:

30 Apr 2024

Payload:

Connects to URLs/IPs, Drops files, Modifies system registry

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 files:

  • %User Startup%\fc2_all_trl.vbs
  • %User Temp%\{Random}.tmp
  • %User Temp%\{Random}.tmpdb

(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).. %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).)

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

  • %Application Data%\fc2_all_trl.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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

  • {Malware File Path}\{Malware File Name}.{Malware File Extension}

Other System Modifications

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

HKEY_CURRENT_USER\Software\Microsoft\
Office\15.0\Outlook\
Profiles\Outlook
9375CFF0413111d3B88A00104B2A6676 =

HKEY_CURRENT_USER\Software\Microsoft\
Office\16.0\Outlook\
Profiles\Outlook
9375CFF0413111d3B88A00104B2A6676 =

HKEY_CURRENT_USER\Software\Microsoft\
Office\17.0\Outlook\
Profiles\Outlook
9375CFF0413111d3B88A00104B2A6676 =

HKEY_CURRENT_USER\Software\Microsoft\
Office\18.0\Outlook\
Profiles\Outlook
9375CFF0413111d3B88A00104B2A6676 =

HKEY_CURRENT_USER\Software\Microsoft\
Office\19.0\Outlook\
Profiles\Outlook
9375CFF0413111d3B88A00104B2A6676 =

HKEY_CURRENT_USER\Software\Microsoft\
Office\20.0\Outlook\
Profiles\Outlook
9375CFF0413111d3B88A00104B2A6676 =

HKEY_CURRENT_USER\Software
c4becaaba4cfc716 =

Other Details

This Trojan connects to the following possibly malicious URL:

  • https://{BLOCKED}rallic.com
  • https://{BLOCKED}rallic.com/condor/Gqwpkmu.pdf
  • http://{BLOCKED}cr.org/