TrojanDownloader:Win32/Fosniw.C

Spectating the TrojanDownloader:Win32/Fosniw.C detection name usually means that your computer is in big danger. This computer virus can correctly be named as ransomware – sort of malware which ciphers your files and asks you to pay for their decryption. Deleteing it requires some specific steps that must be done as soon as possible.

TrojanDownloader:Win32/Fosniw.C detection is a malware detection you can spectate in your computer. It usually shows up after the provoking activities on your PC – opening the untrustworthy e-mail, clicking the banner in the Web or mounting the program from dubious resources. From the second it appears, you have a short time to do something about it until it begins its malicious activity. And be sure – it is much better not to await these harmful actions.

What is TrojanDownloader:Win32/Fosniw.C virus?

TrojanDownloader:Win32/Fosniw.C is ransomware-type malware. It looks for the documents on your disk drive, ciphers it, and then asks you to pay the ransom for receiving the decryption key. Besides making your files inaccessible, this virus also does a ton of damage to your system. It modifies the networking settings in order to prevent you from looking for the elimination guidelines or downloading the anti-malware program. Sometimes, TrojanDownloader:Win32/Fosniw.C can also prevent the launching of anti-malware programs.

TrojanDownloader:Win32/Fosniw.C Summary

Summarizingly, TrojanDownloader:Win32/Fosniw.C malware actions in the infected computer are next:

  • Performs HTTP requests potentially not found in PCAP.;
  • Unconventionial language used in binary resources: Korean;
  • The binary contains an unknown PE section name indicative of packing;
  • The binary likely contains encrypted or compressed data.;
  • The executable is compressed using UPX;
  • Authenticode signature is invalid;
  • Attempts to modify proxy settings;
  • Harvests cookies for information gathering;
  • Yara rule detections observed from a process memory dump/dropped files/CAPE;
  • Encrypting the documents located on the target’s disk — so the victim cannot open these documents;
  • Blocking the launching of .exe files of anti-virus apps
  • Blocking the launching of installation files of anti-virus programs

Ransomware has been a nightmare for the last 4 years. It is challenging to realize a more damaging malware for both individual users and companies. The algorithms used in TrojanDownloader:Win32/Fosniw.C (generally, RHA-1028 or AES-256) are not hackable – with minor exclusions. To hack it with a brute force, you need to have a lot more time than our galaxy already exists, and possibly will exist. However, that malware does not do all these bad things immediately – it can require up to several hours to cipher all of your files. Thus, seeing the TrojanDownloader:Win32/Fosniw.C detection is a clear signal that you should start the elimination process.

Where did I get the TrojanDownloader:Win32/Fosniw.C?

General ways of TrojanDownloader:Win32/Fosniw.C distribution are standard for all other ransomware examples. Those are one-day landing web pages where users are offered to download and install the free app, so-called bait emails and hacktools. Bait e-mails are a quite new tactic in malware distribution – you get the email that simulates some regular notifications about shippings or bank service conditions modifications. Within the email, there is an infected MS Office file, or a link which opens the exploit landing page.

Malicious email spam

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

Preventing it looks quite simple, but still demands tons of recognition. Malware can hide in various places, and it is better to prevent it even before it goes into your computer than to rely on an anti-malware program. Basic cybersecurity awareness is just an essential item in the modern world, even if your relationship with a PC remains on YouTube videos. That can save you a lot of money and time which you would spend while seeking a solution.

TrojanDownloader:Win32/Fosniw.C malware technical details

File Info:

name: 3AC400A8A2FF687F215A.mlwpath: /opt/CAPEv2/storage/binaries/05e2eea9763f9c1b906cc623ddc54ae8eda08f5de577d298dc652aac41840592crc32: B136CCA0md5: 3ac400a8a2ff687f215a13af35995710sha1: 82d9483c223e267efc507aede6a24d5f9684f692sha256: 05e2eea9763f9c1b906cc623ddc54ae8eda08f5de577d298dc652aac41840592sha512: e4e80e7aa9f9b28c85c8a3229ed90334270c1f799422879c79ee52d37eae04210a41fffaed31fe71f0e8fbf67ba8db7ee09dfdfb18d03be6fc5f952d07fcd2dbssdeep: 1536:yvqPRfqCPUJd17cyMVHfIGWmlsr9A2EqrAhrBDlyJsfoLmstfjlzh7cBEvMNnouJ:3PRnVH1lsr9AWAhB6sf8ZtFcSvSouteEtype: PE32 executable (GUI) Intel 80386, for MS Windowstlsh: T1F973F105BB8A5F4ACCDEE1719C0D939E9C64FC348DB8826F9588323E9770766192C48Dsha3_384: fcfc3d083e87c83a296fc9029e583261cb1fdddf962717b4adf0ad742620749f322112559f00377ee4f2b9abc1127aabep_bytes: 60be00a042008dbe0070fdff5789e58dtimestamp: 2010-11-19 00:46:48

Version Info:

CompanyName: TODO: FileDescription: TODO: FileVersion: 1.0.0.1LegalCopyright: TODO: (c) . All rights reserved.InternalName: IEKeyword_EXE.exeOriginalFilename: IEKeyword_EXE.exeProductName: TODO: ProductVersion: 1.0.0.1Translation: 0x0412 0x03b5

TrojanDownloader:Win32/Fosniw.C also known as:

Bkav W32.AIDetectMalware
Lionic Trojan.Win32.Convagent.4!c
MicroWorld-eScan Gen:Variant.Fragtor.214072
FireEye Generic.mg.3ac400a8a2ff687f
CAT-QuickHeal TrojanDownloader.Fosniw.C5
McAfee Generic Malware.u!pec
Cylance unsafe
Zillya Downloader.Fosniw.Win32.74314
Sangfor Trojan.Win32.Save.a
K7AntiVirus Trojan ( 0059c5251 )
Alibaba TrojanDownloader:Win32/Fosniw.6915b27a
K7GW Trojan ( 0059c5251 )
Cybereason malicious.8a2ff6
BitDefenderTheta AI:Packer.2D4D20631F
VirIT Trojan.Win32.Generic.MC
Cyren W32/Fosniw.E.gen!Eldorado
Symantec Downloader
Elastic malicious (moderate confidence)
ESET-NOD32 a variant of Win32/TrojanDownloader.Fosniw.AU
APEX Malicious
Paloalto generic.ml
ClamAV Win.Trojan.Fosniw-2
Kaspersky VHO:Trojan-Ransom.Win32.Convagent.gen
BitDefender Gen:Variant.Fragtor.214072
NANO-Antivirus Riskware.Win32.IEKeyword.ecjffo
Avast Win32:DropperX-gen [Drp]
Tencent Win32.AdWare.Generic.Pzfl
Emsisoft Gen:Variant.Fragtor.214072 (B)
Baidu Win32.Trojan-Downloader.Fosniw.a
F-Secure Trojan.TR/Agent.233472.31
DrWeb Trojan.DownLoader21.45702
VIPRE Gen:Variant.Fragtor.214072
TrendMicro TROJ_AGENT_008606.TOMB
McAfee-GW-Edition BehavesLike.Win32.Generic.lc
Trapmine malicious.high.ml.score
Sophos Mal/Behav-044
Ikarus Gen.Variant.Cudos
GData Gen:Variant.Fragtor.214072
Webroot W32.Downloader.Fosniw.C
Google Detected
Avira TR/Agent.233472.31
Antiy-AVL Trojan/Win32.Unknown
Xcitium TrojWare.Win32.Agent.FNA@3os0mb
Arcabit Trojan.Fragtor.D34438
ZoneAlarm not-a-virus:HEUR:AdWare.Win32.Generic
Microsoft TrojanDownloader:Win32/Fosniw.C
Cynet Malicious (score: 100)
AhnLab-V3 Win-Trojan/Winsoft31.Gen
VBA32 BScope.Trojan.Occamy
ALYac Gen:Variant.Fragtor.214072
MAX malware (ai score=100)
Malwarebytes Malware.AI.4074839274
Panda Trj/Genetic.gen
TrendMicro-HouseCall TROJ_AGENT_008606.TOMB
Rising Trojan.IEKeyword!1.6A27 (CLOUD)
Yandex Trojan.GenAsa!0ZWgMw0FVW4
MaxSecure Trojan.Malware.300983.susgen
Fortinet W32/Dloader.ANW!tr
AVG Win32:DropperX-gen [Drp]
DeepInstinct MALICIOUS
CrowdStrike win/malicious_confidence_100% (W)

How to remove TrojanDownloader:Win32/Fosniw.C?

About the author

Robert Bailey

Security engineer focused on malware behavior, removal workflows, and Windows hardening. Robert reviews threat articles for practical accuracy, checking detection names, symptoms, and cleanup steps before publication.

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