What is Trojan:Win32/Sirefef.P infection?

In this article you will certainly find concerning the interpretation of Trojan:Win32/Sirefef.P and its unfavorable effect on your computer. Such ransomware are a form of malware that is elaborated by on-line frauds to require paying the ransom money by a sufferer.

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In the majority of the instances, Trojan:Win32/Sirefef.P infection will instruct its sufferers to start funds move for the function of reducing the effects of the changes that the Trojan infection has actually introduced to the sufferer’s gadget.

Trojan:Win32/Sirefef.P Summary

These adjustments can be as adheres to:

  • 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.
  • Injection (inter-process);
  • Injection (Process Hollowing);
  • 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.
  • Detects Sandboxie through the presence of a library;
  • Executed a process and injected code into it, probably while unpacking;
  • Crashed cuckoomon during analysis. Report this error to the Github repo.;
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the papers situated on the victim’s hard disk drive — so the sufferer can no longer make use of the information;
  • Preventing routine accessibility to the victim’s workstation. This is the typical behavior of a virus called locker. It blocks access to the computer until the victim pays the ransom.


The most normal channels whereby Trojan:Win32/Sirefef.P Trojans are infused are:

  • By methods of phishing e-mails. Email phishing is a cyber attack that uses disguised email as a goal is to trick the recipient into believing that the message is something they want or need — a request from their bank, for instance, or a note from someone in their company — and to click a link for download a malware.
  • As a consequence of user ending up on a source that organizes a destructive software application;

As soon as the Trojan is efficiently injected, it will either cipher the data on the sufferer’s computer or protect against the device from functioning in an appropriate manner – while also positioning a ransom note that states the requirement for the victims to effect the payment for the objective of decrypting the records or restoring the data system back to the preliminary condition. In the majority of circumstances, the ransom money note will show up when the client reboots the PC after the system has actually already been damaged.

Trojan:Win32/Sirefef.P circulation networks.

In various edges of the globe, Trojan:Win32/Sirefef.P grows by jumps and bounds. Nevertheless, the ransom money notes and methods of extorting the ransom money quantity may vary relying on specific regional (regional) settings. The ransom money notes and techniques of extorting the ransom amount may differ depending on specific local (regional) settings.

Ransomware injection

For example:

    Faulty alerts concerning unlicensed software program.

    In particular areas, the Trojans typically wrongfully report having actually found some unlicensed applications allowed on the target’s gadget. The sharp after that requires the individual to pay the ransom.

    Faulty statements about prohibited content.

    In countries where software application piracy is less popular, this method is not as reliable for the cyber frauds. Conversely, the Trojan:Win32/Sirefef.P popup alert might incorrectly declare to be stemming from a law enforcement institution and will certainly report having situated child porn or various other prohibited information on the device.

    Trojan:Win32/Sirefef.P popup alert might falsely assert to be obtaining from a regulation enforcement organization and also will report having situated youngster pornography or other prohibited data on the device. The alert will in a similar way consist of a demand for the customer to pay the ransom.

Technical details

File Info:

crc32: 923D6745
md5: 3479d0991bdba3375bec8a37a4e030d3
name: 3479D0991BDBA3375BEC8A37A4E030D3.mlw
sha1: 1f2f5f3040775a4f41461016914ff7a1a09a14fb
sha256: 7e4321660c1b4489e8394ae151263b9b4db2a91a92e24e88bbc02ba7e6a1a907
sha512: b3e72f3c5849500f668dbd064e40a2c9ba6c6a764fa366a9e95759ce4ef7cec1357117af6696eda6ae07699e5de968e6ebb999a4434ae9c2974b08cf0d5352d9
ssdeep: 24576:9KXdsXPbNqzWPLkGfNdfkpXo5u9jlm6skuL+Mb:BgwQyfJ5as6
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

LegalCopyright: NoVirusThanks Company Srl
CompanyName: NoVirusThanks Company Srl
Comments: NPE File Analyzer
ProductName: NPE File Analyzer
FileDescription: NPE File Analyzer
OriginalFilename: NPE.exe
Translation: 0x0810 0x04e4

Trojan:Win32/Sirefef.P also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
DrWeb Trojan.Fogels.2
Cynet Malicious (score: 85)
ALYac Gen:Variant.Delf.Crypt.2
Cylance Unsafe
Zillya Trojan.Blocker.Win32.34490
Sangfor Trojan.Win32.Save.a
Alibaba Ransom:Win32/Blocker.8b3ea32b
K7GW RootKit ( 0044814a1 )
K7AntiVirus RootKit ( 0044814a1 )
Cyren W32/Trojan.XIQV-3843
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/Injector.AMUC
Zoner Trojan.Win32.19418
APEX Malicious
Avast FileRepMalware
Kaspersky Trojan-Ransom.Win32.Blocker.cgyd
BitDefender Gen:Variant.Delf.Crypt.2
NANO-Antivirus Trojan.Win32.Blocker.ecjqft
MicroWorld-eScan Gen:Variant.Delf.Crypt.2
Tencent Win32.Trojan.Blocker.Ljan
Ad-Aware Gen:Variant.Delf.Crypt.2
Sophos Mal/Generic-S
BitDefenderTheta Gen:NN.ZelphiF.34628.MH0@aO6ioKj
McAfee-GW-Edition GenericRXEN-TO!3479D0991BDB
Emsisoft Gen:Variant.Delf.Crypt.2 (B)
Jiangmin Trojan/Blocker.gkr
Avira HEUR/AGEN.1102458
eGambit Generic.Malware
Microsoft Trojan:Win32/Sirefef.P
Arcabit Trojan.Delf.Crypt.2
AegisLab Trojan.Win32.Blocker.j!c
GData Gen:Variant.Delf.Crypt.2
McAfee GenericRXEN-TO!3479D0991BDB
MAX malware (ai score=98)
VBA32 TScope.Trojan.Delf
Malwarebytes Malware.Heuristic.1006
Panda Trj/CI.A
Rising Ransom.Blocker!8.12A (C64:YzY0Ojqmqq1NwPK0)
Yandex Trojan.GenAsa!cPMAhSs9p0o
Ikarus Virus.Win32.CeeInject
Fortinet W32/Generic.AC.22F3AA!tr
AVG FileRepMalware
Qihoo-360 HEUR/QVM05.1.Malware.Gen

How to remove Trojan:Win32/Sirefef.P ransomware?

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 Trojan:Win32/Sirefef.P 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/Sirefef.P you can always ask me in the comments for getting help.

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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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