TrojanDropper:Win32/Sirefef Virus Removal

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

Seeing the TrojanDropper:Win32/Sirefef detection means that your PC is in big danger. This computer virus can correctly be identified as ransomware – type of malware which ciphers your files and forces you to pay for their decryption. Removing it requires some specific steps that must be taken as soon as possible.

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TrojanDropper:Win32/Sirefef detection is a virus detection you can spectate in your computer. It frequently appears after the preliminary procedures on your PC – opening the suspicious email, clicking the advertisement in the Internet or setting up the program from unreliable sources. From the moment it shows up, you have a short time to act until it begins its destructive activity. And be sure – it is far better not to await these harmful things.

What is TrojanDropper:Win32/Sirefef virus?

TrojanDropper:Win32/Sirefef is ransomware-type malware. It searches for the documents on your disk, encrypts it, and then asks you to pay the ransom for receiving the decryption key. Besides making your files inaccessible, this virus also does a lot of damage to your system. It modifies the networking settings in order to prevent you from reading the elimination guides or downloading the anti-malware program. In some cases, TrojanDropper:Win32/Sirefef can even block the launching of anti-malware programs.

TrojanDropper:Win32/Sirefef Summary

In summary, TrojanDropper:Win32/Sirefef ransomware activities in the infected PC are next:

  • Behavioural detection: Executable code extraction – unpacking;
  • Sample contains Overlay data;
  • Uses Windows utilities for basic functionality;
  • Reads data out of its own binary image;
  • CAPE extracted potentially suspicious content;
  • Authenticode signature is invalid;
  • Uses Windows utilities to create a scheduled task;
  • Behavioural detection: Injection (Process Hollowing);
  • Behavioural detection: Injection (inter-process);
  • Attempts to modify browser security settings;
  • Creates a copy of itself;
  • Attempts to disable browser security warnings;
  • Anomalous binary characteristics;
  • Uses suspicious command line tools or Windows utilities;
  • Yara detections observed in process dumps, payloads or dropped files;
  • Ciphering the documents located on the target’s disk — so the victim cannot use these files;
  • Blocking the launching of .exe files of anti-virus apps
  • Blocking the launching of installation files of anti-virus apps

Ransomware has been a horror story for the last 4 years. It is difficult to realize a more damaging virus for both individuals and companies. The algorithms utilized in TrojanDropper:Win32/Sirefef (generally, RHA-1028 or AES-256) are not hackable – with minor exclusions. To hack it with a brute force, you need more time than our galaxy currently exists, and possibly will exist. However, that virus does not do all these unpleasant things instantly – it may take up to a few hours to cipher all of your documents. Therefore, seeing the TrojanDropper:Win32/Sirefef detection is a clear signal that you must start the elimination procedure.

Where did I get the TrojanDropper:Win32/Sirefef?

Ordinary methods of TrojanDropper:Win32/Sirefef injection are usual for all other ransomware examples. Those are one-day landing websites where users are offered to download the free software, so-called bait e-mails and hacktools. Bait emails are a relatively modern method in malware distribution – you get the email that simulates some normal notifications about deliveries or bank service conditions shifts. Inside of the email, there is an infected MS Office file, or a web link which opens the exploit landing site.

Malicious email spam

Malicious email message. This one tricks you to open the phishing website.

Avoiding it looks fairly uncomplicated, but still needs a lot of focus. Malware can hide in different spots, and it is far better to stop it even before it gets into your system than to rely upon an anti-malware program. General cybersecurity awareness is just an important thing in the modern world, even if your relationship with a computer stays on YouTube videos. That may keep you a lot of money and time which you would spend while searching for a solution.

TrojanDropper:Win32/Sirefef malware technical details

File Info:

name: DEF69F039626979D185C.mlw
path: /opt/CAPEv2/storage/binaries/f4c60f9cd48a8567dc68e2ee604f55bc3d5a67230459e787d71c2e615cb7c69d
crc32: 2EAA7AB4
md5: def69f039626979d185c4cab463fdda6
sha1: dc78ef6ec312df44c03b2f56db3f503c84cc694e
sha256: f4c60f9cd48a8567dc68e2ee604f55bc3d5a67230459e787d71c2e615cb7c69d
sha512: 5fcadff5a9fb245876e40254917bbb8d7e2f2bd4bce98d7dde108eaaa657961b2a2081a856c1a6bbdf10fdb3adb7b7ae7e58014283705e419c36bfb13e72f6b3
ssdeep: 6144:S/ZGI9E4wZX4mzfr0Ix/l//v/itjybQUMQ:SbPyZzfIIx/l/H/itj0/MQ
type: PE32 executable (GUI) Intel 80386, for MS Windows
tlsh: T1E544BF6BB544A0E6F177C4F87454F18BA91DEC3262A14C17B6C61B0A75B9382FEA031F
sha3_384: 0f31b4843d21858b9a289d3b959f7869c69164d992c264c111fca7c05f4b19eae3e5757aa367e9959ad19ad799d0eae1
ep_bytes: 686c2b4000e8f0ffffff000000000000
timestamp: 2013-09-25 18:33:56

Version Info:

Translation: 0x0409 0x04b0
CompanyName: MaliopersLichers
ProductName: SaloperdosMuchos
FileVersion: 1.00
ProductVersion: 1.00
InternalName: Kilogramm
OriginalFilename: Kilogramm.exe

TrojanDropper:Win32/Sirefef also known as:

Bkav W32.AIDetectMalware
Lionic Trojan.Win32.Blocker.V!c
Elastic malicious (high confidence)
MicroWorld-eScan Gen:Variant.Jaik.32980
CAT-QuickHeal Worm.Gamarue.I3
Skyhigh BehavesLike.Win32.Generic.dc
McAfee PWS-Zbot.gen.oj
Malwarebytes Generic.Malware/Suspicious
Zillya Trojan.Blocker.Win32.11032
Sangfor Suspicious.Win32.Save.vb
K7AntiVirus Trojan ( 0055e3991 )
Alibaba Ransom:Win32/Blocker.aa71c2af
K7GW Trojan ( 0055e3991 )
CrowdStrike win/malicious_confidence_100% (W)
VirIT Trojan.Win32.Generic.CNRE
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/Injector.ANKL
APEX Malicious
TrendMicro-HouseCall TROJ_SPNR.1AJ213
Kaspersky Trojan-Ransom.Win32.Blocker.cjpf
BitDefender Gen:Variant.Jaik.32980
NANO-Antivirus Trojan.Win32.Blocker.crkzch
Avast Win32:Emotet-AQ [Trj]
Tencent Trojan-ransom.Win32.Blocker.cjpf
Emsisoft Gen:Variant.Jaik.32980 (B)
F-Secure Backdoor.BDS/Androm.atao
DrWeb Trojan.Winlock.10061
VIPRE Gen:Variant.Jaik.32980
TrendMicro TROJ_SPNR.1AJ213
Sophos Mal/Generic-S
SentinelOne Static AI – Malicious PE
MAX malware (ai score=100)
Jiangmin Trojan/Blocker.grc
Google Detected
Avira BDS/Androm.atao
Varist W32/VBInject.ER.gen!Eldorado
Antiy-AVL Trojan[Ransom]/Win32.Blocker
Kingsoft malware.kb.a.1000
Microsoft TrojanDropper:Win32/Sirefef
Xcitium TrojWare.Win32.Injector.ANJM@52gqk7
Arcabit Trojan.Jaik.D80D4
ZoneAlarm Trojan-Ransom.Win32.Blocker.cjpf
GData Gen:Variant.Jaik.32980
Cynet Malicious (score: 100)
AhnLab-V3 Trojan/Win32.Agent.R83144
BitDefenderTheta Gen:NN.ZevbaF.36802.pm3@aql6oZc
ALYac Gen:Variant.Jaik.32980
VBA32 Hoax.Blocker
Cylance unsafe
Panda Trj/Genetic.gen
Rising Dropper.Sirefef!8.525 (TFE:3:ahzkoURDhaF)
Yandex Trojan.GenAsa!cX5IU/a6vhg
Ikarus Trojan-Downloader.Win32.Obvod
MaxSecure Trojan.Malware.6453065.susgen
Fortinet W32/Injector.ALXK!tr
AVG Win32:Emotet-AQ [Trj]
Cybereason malicious.396269
DeepInstinct MALICIOUS
alibabacloud Ransomware:Win/Blocker.cjpf

How to remove TrojanDropper:Win32/Sirefef?

TrojanDropper:Win32/Sirefef malware is extremely hard to eliminate manually. It puts its files in several places throughout the disk, and can recover itself from one of the parts. Additionally, a number of alterations in the windows registry, networking setups and also Group Policies are quite hard to identify and change to the initial. It is much better to make use of a specific program – exactly, an anti-malware tool. GridinSoft Anti-Malware will fit the most ideal for malware elimination goals.

Remove TrojanDropper:Win32/Sirefef with Gridinsoft Anti-Malware

We have also been using this software on our systems ever since, and it has always been successful in detecting viruses. It has blocked the most common Trojans as shown from our tests with the software, and we assure you that it can remove TrojanDropper:Win32/Sirefef as well as other malware hiding on your computer.

Gridinsoft Anti-Malware - Main Screen

To use Gridinsoft for remove malicious threats, follow the steps below:

1. Begin by downloading Gridinsoft Anti-Malware, accessible via the blue button below or directly from the official website

2.Once the Gridinsoft setup file (setup-gridinsoft-fix.exe) is downloaded, execute it by clicking on the file.


3.Follow the installation setup wizard's instructions diligently.

Gridinsoft Setup Wizard

4. Access the "Scan Tab" on the application's start screen and launch a comprehensive "Full Scan" to examine your entire computer. This inclusive scan encompasses the memory, startup items, the registry, services, drivers, and all files, ensuring that it detects malware hidden in all possible locations.

Scan for TrojanDropper:Win32/Sirefef Trojans

Be patient, as the scan duration depends on the number of files and your computer's hardware capabilities. Use this time to relax or attend to other tasks.

5. Upon completion, Anti-Malware will present a detailed report containing all the detected malicious items and threats on your PC.

The TrojanDropper:Win32/Sirefef was Found

6. Select all the identified items from the report and confidently click the "Clean Now" button. This action will safely remove the malicious files from your computer, transferring them to the secure quarantine zone of the anti-malware program to prevent any further harmful actions.

The TrojanDropper:Win32/Sirefef has been removed

8. If prompted, restart your computer to finalize the full system scan procedure. This step is crucial to ensure thorough removal of any remaining threats. After the restart, Gridinsoft Anti-Malware will open and display a message confirming the completion of the scan.

Remember Gridinsoft offers a 6-day free trial. This means you can take advantage of the trial period at no cost to experience the full benefits of the software and prevent any future malware infections on your system. Embrace this opportunity to fortify your computer's security without any financial commitment.

Trojan Killer for “TrojanDropper:Win32/Sirefef” removal on locked PC

In situations where it becomes impossible to download antivirus applications directly onto the infected computer due to malware blocking access to websites, an alternative solution is to utilize the Trojan Killer application.

Trojan Killer - Main View

There is a really little number of security tools that are able to be set up on the USB drives, and antiviruses that can do so in most cases require to obtain quite an expensive license. For this instance, I can recommend you to use another solution of GridinSoft - Trojan Killer Portable. It has a 14-days cost-free trial mode that offers the entire features of the paid version. This term will definitely be 100% enough to wipe malware out.

Trojan Killer is a valuable tool in your cybersecurity arsenal, helping you to effectively remove malware from infected computers. Now, we will walk you through the process of using Trojan Killer from a USB flash drive to scan and remove malware on an infected PC. Remember, always obtain permission to scan and remove malware from a computer that you do not own.

Step 1: Download & Install Trojan Killer on a Clean Computer:

1. Go to the official GridinSoft website ( and download Trojan Killer to a computer that is not infected.

Download Trojan Killer

2. Insert a USB flash drive into this computer.

3. Install Trojan Killer to the "removable drive" following the on-screen instructions.

Install Trojan Killer to Removable Drive

4. Once the installation is complete, launch Trojan Killer.

Step 2: Update Signature Databases:

5. After launching Trojan Killer, ensure that your computer is connected to the Internet.

6. Click "Update" icon to download the latest signature databases, which will ensure the tool can detect the most recent threats.

Click Update Button

Step 3: Scan the Infected PC:

7. Safely eject the USB flash drive from the clean computer.

8. Boot the infected computer to the Safe Mode.

9. Insert the USB flash drive.

10. Run tk.exe

11. Once the program is open, click on "Full Scan" to begin the malware scanning process.

Searching TrojanDropper:Win32/Sirefef Virus

Step 4: Remove Found Threats:

12. After the scan is complete, Trojan Killer will display a list of detected threats.

Searching TrojanDropper:Win32/Sirefef Finished

13. Click on "Cure PC!" to remove the identified malware from the infected PC.

14. Follow any additional on-screen prompts to complete the removal process.

Restart needed

Step 5: Restart Your Computer:

15. Once the threats are removed, click on "Restart PC" to reboot your computer.

16. Remove the USB flash drive from the infected computer.

Congratulations on effectively removing TrojanDropper:Win32/Sirefef and the concealed threats from your computer! You can now have peace of mind, knowing that they won't resurface again. Thanks to Gridinsoft's capabilities and commitment to cybersecurity, your system is now protected.

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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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