Trojan:Win32/Lethic.N

Written by Robert Bailey

What is Trojan:Win32/Lethic.N infection?

In this article you will certainly discover about the meaning of Trojan:Win32/Lethic.N and its negative influence on your computer. Such ransomware are a type of malware that is specified by online fraudulences to require paying the ransom money by a victim.

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Most of the instances, Trojan:Win32/Lethic.N virus will instruct its sufferers to launch funds transfer for the function of neutralizing the modifications that the Trojan infection has presented to the victim’s device.

Trojan:Win32/Lethic.N Summary

These modifications can be as complies with:

  • Executable code extraction. Cybercriminals often use binary packers to hinder the malicious code from reverse-engineered by malware analysts. A packer is a tool that compresses, encrypts, and modifies a malicious file’s format. Sometimes packers can be used for legitimate ends, for example, to protect a program against cracking or copying.
  • Creates RWX memory. There is a security trick with memory regions that allows an attacker to fill a buffer with a shellcode and then execute it. Filling a buffer with shellcode isn’t a big deal, it’s just data. The problem arises when the attacker is able to control the instruction pointer (EIP), usually by corrupting a function’s stack frame using a stack-based buffer overflow, and then changing the flow of execution by assigning this pointer to the address of the shellcode.
  • Repeatedly searches for a not-found process, may want to run with startbrowser=1 option;
  • Unconventionial language used in binary resources: Saami;
  • Detects the presence of Wine emulator via function name;
  • Detects SunBelt Sandbox through the presence of a library;
  • Detects Avast Antivirus through the presence of a library;
  • Deletes its original binary from disk;
  • A system process is generating network traffic likely as a result of process injection;
  • Installs itself for autorun at Windows startup. There is simple tactic using the Windows startup folder located at:
    C:\Users\[user-name]\AppData\Roaming\Microsoft\Windows\StartMenu\Programs\Startup. Shortcut links (.lnk extension) placed in this folder will cause Windows to launch the application each time [user-name] logs into Windows.

    The registry run keys perform the same action, and can be located in different locations:

    • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • Creates a hidden or system file. The malware adds the hidden attribute to every file and folder on your system, so it appears as if everything has been deleted from your hard drive.
  • Checks the version of Bios, possibly for anti-virtualization;
  • Detects VirtualBox through the presence of a device;
  • Detects VirtualBox through the presence of a registry key;
  • Creates a copy of itself;
  • Ciphering the files located on the sufferer’s hard disk drive — so the victim can no longer use the information;
  • Preventing routine access to the sufferer’s workstation;

Trojan:Win32/Lethic.N

One of the most typical channels where Trojan:Win32/Lethic.N are infused are:

  • By means of phishing e-mails;
  • As a consequence of individual winding up on a source that holds a harmful software application;

As soon as the Trojan is efficiently infused, it will either cipher the data on the victim’s PC or stop the gadget from functioning in a correct fashion – while likewise placing a ransom money note that points out the demand for the sufferers to impact the settlement for the purpose of decrypting the documents or restoring the file system back to the preliminary condition. In the majority of instances, the ransom note will come up when the client restarts the COMPUTER after the system has actually currently been damaged.

Trojan:Win32/Lethic.N distribution channels.

In different corners of the world, Trojan:Win32/Lethic.N expands by jumps and bounds. Nonetheless, the ransom money notes as well as methods of obtaining the ransom money amount might vary depending upon particular local (local) settings. The ransom money notes as well as methods of obtaining the ransom amount might vary depending on specific neighborhood (local) setups.

Ransomware injection

For example:

    Faulty signals concerning unlicensed software.

    In specific locations, the Trojans typically wrongfully report having spotted some unlicensed applications made it possible for on the sufferer’s gadget. The sharp after that demands the customer to pay the ransom money.

    Faulty statements about unlawful material.

    In countries where software application piracy is less preferred, this technique is not as effective for the cyber fraudulences. Conversely, the Trojan:Win32/Lethic.N popup alert may falsely declare to be originating from a police institution and also will report having situated kid pornography or other unlawful information on the tool.

    Trojan:Win32/Lethic.N popup alert may wrongly claim to be obtaining from a legislation enforcement institution and also will report having situated kid pornography or other illegal information on the device. The alert will likewise have a demand for the user to pay the ransom money.

Technical details

File Info:

crc32: 7EACDB22
md5: dcc6c00f66325aa244cbcc7346ac6996
name: DCC6C00F66325AA244CBCC7346AC6996.mlw
sha1: 7a497c2708f4481ff27e72ced0e37cfe375f2d51
sha256: b04991509430b12999f07be98684e4905cc47b96aff3074053c853e1443c479b
sha512: 7ec09b4e7d3684c41285b09770008a77023f69f66eb4de0af3704ce5274f8839a64bebdfbb99051b0e42824478036d7614f7b9096bc908d05314a76b1fed0bb9
ssdeep: 3072:47vIojhK+hd3/3ufcPKZQXUU2N/iAg0FukkBN1XVN+pBH/q45ekrmj9R:+AoN/PiZQV2gAOk8fVqBfq4VyR
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

Trojan:Win32/Lethic.N also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.Common.52686B3C
K7AntiVirus Trojan ( 004eb1a91 )
Elastic malicious (high confidence)
DrWeb Trojan.Proxy2.182
Cynet Malicious (score: 99)
CAT-QuickHeal Ransom.Tescrypt.A4
ALYac Trojan.Lethic.Gen.14
Cylance Unsafe
Zillya Trojan.Garrun.Win32.144
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_80% (D)
K7GW Trojan ( 004eb1a91 )
Cybereason malicious.f66325
Baidu Win32.Trojan.Kryptik.vz
Symantec Ransom.TeslaCrypt
ESET-NOD32 a variant of Win32/Kryptik.EOZZ
APEX Malicious
Avast Win32:Dorder-W [Trj]
Kaspersky Trojan.Win32.Agent.iihi
BitDefender Trojan.Lethic.Gen.14
NANO-Antivirus Trojan.Win32.AVKill.eamitc
SUPERAntiSpyware Trojan.Agent/Gen-Kryptik
MicroWorld-eScan Trojan.Lethic.Gen.14
Tencent Win32.Trojan.Garrun.Wvko
Ad-Aware Trojan.Lethic.Gen.14
Sophos Mal/Wonton-CD
Comodo TrojWare.Win32.Droma.EQJ@6b1t5k
BitDefenderTheta AI:Packer.355FBCEE21
VIPRE Trojan.Win32.Generic!BT
TrendMicro Ransom_CRYPTESLA.SMK1
McAfee-GW-Edition Ransom-Tescrypt!DCC6C00F6632
FireEye Generic.mg.dcc6c00f66325aa2
Emsisoft Trojan.Lethic.Gen.14 (B)
Jiangmin Trojan.Bitman.ik
Webroot W32.Malware.Gen
Avira HEUR/AGEN.1128836
eGambit Unsafe.AI_Score_99%
Kingsoft Win32.Troj.GenericKD.v.(kcloud)
Microsoft Trojan:Win32/Lethic.N
Arcabit Trojan.Lethic.Gen.14
ZoneAlarm HEUR:Trojan.Win32.Generic
GData Trojan.Lethic.Gen.14
AhnLab-V3 Trojan/Win32.Teslacrypt.R175087
McAfee Ransom-Tescrypt!DCC6C00F6632
MAX malware (ai score=80)
VBA32 BScope.Trojan.Agent
Panda Trj/CI.A
TrendMicro-HouseCall Ransom_CRYPTESLA.SMK1
Rising Trojan.Kryptik!1.A32E (CLOUD)
Yandex Trojan.Garrun!cakIRB5RiZI
Ikarus Trojan.Win32.Filecoder
Fortinet W32/Kryptik.FXWS!tr
AVG Win32:Dorder-W [Trj]
Paloalto generic.ml
Qihoo-360 Win32/Trojan.Lethic.HykCuAEA

How to remove Trojan:Win32/Lethic.N ransomware?

Unwanted application has ofter come with other viruses and spyware. This threats can steal account credentials, or crypt your documents for ransom.
Reasons why I would recommend GridinSoft1

There is no better way to recognize, remove and prevent PC threats than to use an anti-malware software from GridinSoft2.

Download GridinSoft Anti-Malware.

You can download GridinSoft Anti-Malware by clicking the button below:

Run the setup file.

When setup file has finished downloading, double-click on the setup-antimalware-fix.exe file to install GridinSoft Anti-Malware on your system.

Run Setup.exe

An User Account Control asking you about to allow GridinSoft Anti-Malware to make changes to your device. So, you should click “Yes” to continue with the installation.

GridinSoft Anti-Malware Setup

Press “Install” button.

GridinSoft Anti-Malware Install

Once installed, Anti-Malware will automatically run.

GridinSoft Anti-Malware Splash-Screen

Wait for the Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your system for Trojan:Win32/Lethic.N files and other malicious programs. This process can take a 20-30 minutes, so I suggest you periodically check on the status of the scan process.

GridinSoft Anti-Malware Scanning

Click on “Clean Now”.

When the scan has finished, you will see the list of infections that GridinSoft Anti-Malware has detected. To remove them click on the “Clean Now” button in right corner.

GridinSoft Anti-Malware Scan Result

Are Your Protected?

GridinSoft Anti-Malware will scan and clean your PC for free in the trial period. The free version offer real-time protection for first 2 days. If you want to be fully protected at all times – I can recommended you to purchase a full version:

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If the guide doesn’t help you to remove Trojan:Win32/Lethic.N you can always ask me in the comments for getting help.

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References

  1. GridinSoft Anti-Malware Review from HowToFix site: https://howtofix.guide/gridinsoft-anti-malware/
  2. More information about GridinSoft products: https://gridinsoft.com/products/

About the author

Robert Bailey

Security Engineer. Interested in malware, reverse engineering, white ethical hacking. I like coding, travelling and bikes.

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