What is the Win32:Evo-gen [Trj] virus?
Written by Robert Bailey
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.
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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.mlw
path: /opt/CAPEv2/storage/binaries/05e2eea9763f9c1b906cc623ddc54ae8eda08f5de577d298dc652aac41840592
crc32: B136CCA0
md5: 3ac400a8a2ff687f215a13af35995710
sha1: 82d9483c223e267efc507aede6a24d5f9684f692
sha256: 05e2eea9763f9c1b906cc623ddc54ae8eda08f5de577d298dc652aac41840592
sha512: e4e80e7aa9f9b28c85c8a3229ed90334270c1f799422879c79ee52d37eae04210a41fffaed31fe71f0e8fbf67ba8db7ee09dfdfb18d03be6fc5f952d07fcd2db
ssdeep: 1536:yvqPRfqCPUJd17cyMVHfIGWmlsr9A2EqrAhrBDlyJsfoLmstfjlzh7cBEvMNnouJ:3PRnVH1lsr9AWAhB6sf8ZtFcSvSouteE
type: PE32 executable (GUI) Intel 80386, for MS Windows
tlsh: T1F973F105BB8A5F4ACCDEE1719C0D939E9C64FC348DB8826F9588323E9770766192C48D
sha3_384: fcfc3d083e87c83a296fc9029e583261cb1fdddf962717b4adf0ad742620749f322112559f00377ee4f2b9abc1127aab
ep_bytes: 60be00a042008dbe0070fdff5789e58d
timestamp: 2010-11-19 00:46:48

Version Info:

CompanyName: TODO:
FileDescription: TODO:
LegalCopyright: TODO: (c) . All rights reserved.
InternalName: IEKeyword_EXE.exe
OriginalFilename: IEKeyword_EXE.exe
ProductName: TODO:
Translation: 0x0412 0x03b5

TrojanDownloader:Win32/Fosniw.C also known as:

McAfeeGeneric Malware.u!pec
K7AntiVirusTrojan ( 0059c5251 )
K7GWTrojan ( 0059c5251 )
Elasticmalicious (moderate confidence)
ESET-NOD32a variant of Win32/TrojanDownloader.Fosniw.AU
AvastWin32:DropperX-gen [Drp]
EmsisoftGen:Variant.Fragtor.214072 (B)
CynetMalicious (score: 100)
MAXmalware (ai score=100)
RisingTrojan.IEKeyword!1.6A27 (CLOUD)
AVGWin32:DropperX-gen [Drp]
CrowdStrikewin/malicious_confidence_100% (W)

How to remove TrojanDownloader:Win32/Fosniw.C?

TrojanDownloader:Win32/Fosniw.C malware is extremely difficult to erase by hand. It puts its data in several locations throughout the disk, and can restore itself from one of the parts. Additionally, a number of modifications in the registry, networking settings and Group Policies are fairly hard to locate and return to the original. It is far better to make use of a special app – exactly, an anti-malware tool. GridinSoft Anti-Malware will definitely fit the most ideal for virus elimination purposes.

Why GridinSoft Anti-Malware? It is really light-weight and has its detection databases updated almost every hour. Additionally, it does not have such bugs and exposures as Microsoft Defender does. The combination of these details makes GridinSoft Anti-Malware suitable for getting rid of malware of any type.

Remove the viruses with GridinSoft Anti-Malware

  • Download and install GridinSoft Anti-Malware. After the installation, you will be offered to perform the Standard Scan. Approve this action.
  • Gridinsoft Anti-Malware during the scan process

  • Standard scan checks the logical disk where the system files are stored, together with the files of programs you have already installed. The scan lasts up to 6 minutes.
  • GridinSoft Anti-Malware scan results

  • When the scan is over, you may choose the action for each detected virus. For all files of [SHORT_NAME] the default option is “Delete”. Press “Apply” to finish the malware removal.
  • GridinSoft Anti-Malware - After Cleaning
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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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