Trojan.Win32.EMOTET.UWAOIBEMV

February 18, 2022
 Analysis by: Patrick Noel Collado
 ALIASES:

Trojan:Win32/EmotetCrypt.PEG!MTB (Microsoft), Trojan-Banker.Win32.Emotet.gicw (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

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:

1,012,224 bytes

File Type:

DLL

Memory Resident:

Yes

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:

  • If the sample is ran with administrator rights:
    • %System%\rundll32.exe "%System%\{Random Folder Name}\{Random file name}.{Random 3 letter extension}", {random characters}
    • %System%\rundll32.exe "%System%\{Random Folder Name}\{Random file name}.{Random 3 letter extension}",DllRegisterServer
  • If the sample is ran without administrator rights:
    • %System%\rundll32.exe "%AppDataLocal%\{Random Folder Name}\{Random File Name}.{Random Extension}", {random characters}
    • %System%\rundll32.exe "%AppDataLocal%\{Random Folder Name}\{Random file name}.{Random 3 letter extension}",DllRegisterServer

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}.{BLOCKED}.204.126
  • {BLOCKED}.{BLOCKED}.163.161
  • {BLOCKED}.{BLOCKED}.230.105
  • {BLOCKED}.{BLOCKED}.25.185
  • {BLOCKED}.{BLOCKED}.214.46
  • {BLOCKED}.{BLOCKED}.143.207
  • {BLOCKED}.{BLOCKED}.201.4
  • {BLOCKED}.{BLOCKED}.72.26
  • {BLOCKED}.{BLOCKED}.225.142
  • {BLOCKED}.{BLOCKED}.115.99
  • {BLOCKED}.{BLOCKED}.222.11
  • {BLOCKED}.{BLOCKED}.147.66
  • {BLOCKED}.{BLOCKED}.102.168
  • {BLOCKED}.{BLOCKED}.71.0
  • {BLOCKED}.{BLOCKED}.84.195
  • {BLOCKED}.{BLOCKED}.117.186
  • {BLOCKED}.{BLOCKED}.59.82
  • {BLOCKED}.{BLOCKED}.24.231
  • {BLOCKED}.{BLOCKED}.99.3
  • {BLOCKED}.{BLOCKED}.201.2
  • {BLOCKED}.{BLOCKED}.108.46
  • {BLOCKED}.{BLOCKED}.109.124
  • {BLOCKED}.{BLOCKED}.114.231
  • {BLOCKED}.{BLOCKED}.71.210
  • {BLOCKED}.{BLOCKED}.135.203
  • {BLOCKED}.{BLOCKED}.188.93
  • {BLOCKED}.{BLOCKED}.232.124
  • {BLOCKED}.{BLOCKED}.212.216
  • {BLOCKED}.{BLOCKED}.222.101
  • {BLOCKED}.{BLOCKED}.186.49
  • {BLOCKED}.{BLOCKED}.134.35
  • {BLOCKED}.{BLOCKED}.106.96
  • {BLOCKED}.{BLOCKED}.236.90
  • {BLOCKED}.{BLOCKED}.226.206

It does the following:

  • If the sample is ran with administrator rights it renames itself to %System%\{Random Folder Name}\{Random file name}.{Random 3 letter extension}
  • If the sample is ran without administrator rights it renames itself to %AppDataLocal%\{Random Folder Name}\{Random file name}.{Random 3 letter extension}

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.358.08

FIRST VSAPI PATTERN DATE:

03 Feb 2022

VSAPI OPR PATTERN File:

17.359.00

VSAPI OPR PATTERN Date:

04 Feb 2022

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

Step 2

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 3

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 4

Identify and terminate files detected as Trojan.Win32.EMOTET.UWAOIBEMV

[ 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 5

Search and delete these files

[ Learn More ]
There may be some files 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.
  • %System%\{Random Folder Name}\{Random file name}.{Random 3 letter extension}
  • %AppDataLocal%\{Random Folder Name}\{Random file name}.{Random 3 letter extension}

Step 6

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • If the sample is ran with administrator rights %System%\{Random Folder Name}
  • If the sample is ran without administrator rights %AppDataLocal%\{Random Folder Name}

Step 7

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.EMOTET.UWAOIBEMV. 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 the following Trend Micro Support pages for more information:


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