Backdoor:Win32/Simda!rfn

What is the Win32:Evo-gen [Trj] virus?
Written by Robert Bailey

What is Backdoor:Win32/Simda!rfn infection?

In this post you will certainly discover regarding the meaning of Backdoor:Win32/Simda!rfn as well as its adverse effect on your computer. Such ransomware are a kind of malware that is clarified by online fraudulences to require paying the ransom by a target.

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In the majority of the cases, Backdoor:Win32/Simda!rfn infection will instruct its victims to initiate funds move for the objective of reducing the effects of the changes that the Trojan infection has actually presented to the sufferer’s tool.

Backdoor:Win32/Simda!rfn Summary

These modifications can be as adheres to:

  • Reads data out of its own binary image. The trick that allows the malware to read data out of your computer’s memory.

    Everything you run, type, or click on your computer goes through the memory. This includes passwords, bank account numbers, emails, and other confidential information. With this vulnerability, there is the potential for a malicious program to read that data.

  • A process created a hidden window;
  • The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Uses Windows utilities for basic functionality;
  • Network activity detected but not expressed in API logs. Microsoft built an API solution right into its Windows operating system it reveals network activity for all apps and programs that ran on the computer in the past 30-days. This malware hides network activity.
  • Creates a slightly modified copy of itself;
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the records located on the target’s disk drive — so the target can no more make use of the data;
  • Preventing routine access to the sufferer’s workstation;

Backdoor:Win32/Simda!rfn

The most typical channels whereby Backdoor:Win32/Simda!rfn Ransomware Trojans are infused are:

  • By means of phishing emails;
  • As a consequence of customer winding up on a source that organizes a harmful software application;

As quickly as the Trojan is efficiently injected, it will certainly either cipher the data on the target’s computer or stop the device from functioning in a correct fashion – while likewise placing a ransom note that points out the demand for the sufferers to effect the repayment for the objective of decrypting the records or restoring the file system back to the preliminary condition. In the majority of circumstances, the ransom money note will certainly come up when the customer restarts the COMPUTER after the system has currently been harmed.

Backdoor:Win32/Simda!rfn distribution channels.

In various edges of the world, Backdoor:Win32/Simda!rfn expands by jumps and bounds. Nevertheless, the ransom notes and tricks of extorting the ransom amount may differ depending on specific neighborhood (regional) setups. The ransom money notes and techniques of obtaining the ransom quantity might differ depending on particular regional (regional) setups.

Ransomware injection

For example:

    Faulty signals regarding unlicensed software.

    In specific locations, the Trojans commonly wrongfully report having discovered some unlicensed applications allowed on the sufferer’s tool. The alert then demands the customer to pay the ransom money.

    Faulty statements concerning unlawful web content.

    In nations where software piracy is less preferred, this method is not as effective for the cyber frauds. Alternatively, the Backdoor:Win32/Simda!rfn popup alert might incorrectly claim to be originating from a police institution and also will report having located child pornography or other illegal data on the device.

    Backdoor:Win32/Simda!rfn popup alert might falsely declare to be acquiring from a law enforcement establishment and will certainly report having located kid pornography or other unlawful information on the tool. The alert will similarly contain a demand for the customer to pay the ransom money.

Technical details

File Info:

crc32: 1C67D3B1
md5: bd98dd0b54d40f3ebe5e8c49065659b4
name: BD98DD0B54D40F3EBE5E8C49065659B4.mlw
sha1: 327a6f17094610421ff5e3bb9ac3b913343daf6f
sha256: b7f98d4fa485adf468f1f63c9a4d1b4d6c5283913e8ce43e2048edb10b1e0b9e
sha512: 383c33207f56f95ec815b3b72c37b4272d1eb643d186406bfcbd3746957d6e37cd5f5d407ea8ba98a61bf7f37668c1fcc64bbb9f99147346141e339b3a80d7bd
ssdeep: 3072:I6pQc+sSxnTrGadgsFqZeo4pwkhUmZr3hPsOraS87FYqjTZbn4TGz:I6p2sSxTrGvsFUejWyZr3hPswa1TZjx
type: MS-DOS executable, MZ for MS-DOS

Version Info:

0: [No Data]

Backdoor:Win32/Simda!rfn also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
Elastic malicious (high confidence)
DrWeb Trojan.MulDrop7.20629
MicroWorld-eScan Gen:Variant.Zusy.317803
FireEye Generic.mg.bd98dd0b54d40f3e
CAT-QuickHeal Trojan.Shifu
ALYac Gen:Variant.Zusy.317803
Malwarebytes Simda.Backdoor.Stealer.DDS
VIPRE Trojan.Win32.Generic!BT
Sangfor Win.Malware.Shifu-6804440-0
K7AntiVirus Spyware ( 00557ff01 )
BitDefender Gen:Variant.Zusy.317803
K7GW Spyware ( 00557ff01 )
Cybereason malicious.b54d40
BitDefenderTheta AI:Packer.DB27C8EF1E
Cyren W32/S-7a16e605!Eldorado
Symantec ML.Attribute.HighConfidence
APEX Malicious
ClamAV Win.Trojan.Shifu-6330434-1
Kaspersky Trojan-Banker.Win32.Shifu.eph
NANO-Antivirus Trojan.Win32.Shiz.dvsrfy
ViRobot Trojan.Win32.Agent.168448.U
Ad-Aware Gen:Variant.Zusy.317803
TACHYON Trojan/W32.Agent.176128.BXK
Sophos ML/PE-A + Troj/Shifu-I
Comodo TrojWare.Win32.Spy.Shiz.NCA@8m98i8
F-Secure Trojan.TR/Dropper.Gen
Zillya Trojan.Shifu.Win32.360
McAfee-GW-Edition BehavesLike.Win32.Generic.cc
Emsisoft Gen:Variant.Zusy.317803 (B)
Ikarus Trojan-Banker.ShiFu
GData Win32.Trojan-Spy.Shiz.D
Jiangmin Trojan.Yakes.akc
Avira TR/Dropper.Gen
Antiy-AVL Trojan/Win32.TSGeneric
Gridinsoft Trojan.Win32.Packed.bot!s1
Arcabit Trojan.Zusy.D4D96B
ZoneAlarm Trojan-Banker.Win32.Shifu.eph
Microsoft Backdoor:Win32/Simda!rfn
Cynet Malicious (score: 100)
AhnLab-V3 Trojan/Win32.Shifu.C2756321
Acronis suspicious
McAfee GenericRXGM-ZQ!BD98DD0B54D4
MAX malware (ai score=83)
VBA32 TrojanBanker.Shifu
Cylance Unsafe
Panda Trj/Genetic.gen
Zoner Trojan.Win32.75090
ESET-NOD32 Win32/Spy.Shiz.NCR
Rising Ransom.Blocker!8.12A (TFE:dGZlOgLaeyYIjEMjGQ)
Yandex Trojan.GenAsa!zlrAhKZjOyI
SentinelOne Static AI – Malicious PE
eGambit Unsafe.AI_Score_85%
Fortinet W32/Generic.AC.42C3E4
AVG Win32:Shifu-B [Trj]
Avast Win32:Shifu-B [Trj]
CrowdStrike win/malicious_confidence_100% (D)
Qihoo-360 HEUR/QVM19.1.8F4E.Malware.Gen

How to remove Backdoor:Win32/Simda!rfn virus?

Unwanted application has ofter come with other viruses and spyware. This threats can steal account credentials, or crypt your documents for ransom.
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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 Backdoor:Win32/Simda!rfn 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 Backdoor:Win32/Simda!rfn 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/comparison

About the author

Robert Bailey

I'm Robert Bailey, a passionate Security Engineer with a deep fascination for all things related to malware, reverse engineering, and white hat ethical hacking.

As a white hat hacker, I firmly believe in the power of ethical hacking to bolster security measures. By identifying vulnerabilities and providing solutions, I contribute to the proactive defense of digital infrastructures.

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