Trojan.XF.EMOTET.YJCFO

June 15, 2022
 Analysis by: Eleazar Valles
 ALIASES:

Trojan-Downloader.XLM.Agent (IKARUS)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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:

61,952 bytes

File Type:

XLS

Memory Resident:

No

Initial Samples Received Date:

15 Jun 2022

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 adds the following processes:

  • %System%\regsvr32.exe /S {Parent of default Excel save path}\xgev1.ocx
  • %System%\regsvr32.exe /S {Parent of default Excel save path}\xgev2.ocx
  • %System%\regsvr32.exe /S {Parent of default Excel save path}\xgev3.ocx
  • %System%\regsvr32.exe /S {Parent of default Excel save path}\xgev4.ocx

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Download Routine

This Trojan saves the files it downloads using the following names:

  • {Parent of default Excel save path}\xgev1.ocx
  • {Parent of default Excel save path}\xgev2.ocx
  • {Parent of default Excel save path}\xgev3.ocx
  • {Parent of default Excel save path}\xgev4.ocx

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://www.{BLOCKED}l.com/pun/VAYL/
  • http://{BLOCKED}.com/CeudWYRQEzZgrHPcI/
  • http://{BLOCKED}oyuyin.com/cgj-bin/jZPff/
  • http://{BLOCKED}us.com/slide/mcqAFuMhaekn/