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Trojan.Win32.DELF.ENJ

January 20, 2020
 ALIASES:

Trojan:Win32/Delf.A!MTB (Microsoft); Trojan.Win32.Delf.tind (Kaspersky); Mal/Generic-L (Sophos); Win32.Malware!Drop (Sunbelt)

 PLATFORM:

Windows

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

  • 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:

1,362,432 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

20 Jan 2020

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.

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
esetina = "{malware file path and name}"

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
eset was here = "2"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
ip = "{random characters}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
ip2 = "US"

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}o.io/json

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.850

Step 1

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 2

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
    • esetina = "{malware file path and name}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
    • eset was here = "2"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
    • ip = "{random characters}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
    • ip2 = "US"

Step 4

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Trojan.Win32.DELF.ENJ. 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 this Knowledge Base page for more information.


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