Trojan:Win32/Cosmu.AC!MTB Virus Removal

Spectating the Trojan:Win32/Cosmu.AC!MTB detection name means that your PC is in big danger. This malware can correctly be named as ransomware – sort of malware which encrypts your files and asks you to pay for their decryption. Stopping it requires some unusual steps that must be taken as soon as possible.

Trojan:Win32/Cosmu.AC!MTB detection is a malware detection you can spectate in your system. It generally appears after the preliminary actions on your computer – opening the dubious e-mail, clicking the banner in the Web or mounting the program from dubious resources. From the moment it appears, you have a short time to do something about it until it begins its malicious action. And be sure – it is better not to await these malicious actions.

What is Trojan:Win32/Cosmu.AC!MTB virus?

Trojan:Win32/Cosmu.AC!MTB is ransomware-type malware. It looks for the documents on your computer, encrypts it, and after that asks you to pay the ransom for receiving the decryption key. Besides making your files locked, this malware additionally does a lot of harm to your system. It changes the networking setups in order to stop you from looking for the removal tutorials or downloading the antivirus. Sometimes, Trojan:Win32/Cosmu.AC!MTB can also prevent the setup of anti-malware programs.

Trojan:Win32/Cosmu.AC!MTB Summary

In summary, Trojan:Win32/Cosmu.AC!MTB malware activities in the infected system are next:

  • A file was accessed within the Public folder.;
  • Sample contains Overlay data;
  • Authenticode signature is invalid;
  • Ciphering the files kept on the victim’s drives — so the victim cannot open these documents;
  • Blocking the launching of .exe files of anti-malware apps
  • Blocking the launching of installation files of anti-virus programs

Ransomware has actually been a nightmare for the last 4 years. It is difficult to imagine a more harmful malware for both individual users and companies. The algorithms utilized in Trojan:Win32/Cosmu.AC!MTB (typically, 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 currently exists, and possibly will exist. However, that malware does not do all these unpleasant things without delay – it can require up to a few hours to cipher all of your documents. Therefore, seeing the Trojan:Win32/Cosmu.AC!MTB detection is a clear signal that you have to start the clearing process.

Where did I get the Trojan:Win32/Cosmu.AC!MTB?

Routine tactics of Trojan:Win32/Cosmu.AC!MTB distribution are basic for all other ransomware variants. Those are one-day landing web pages where victims are offered to download and install the free program, so-called bait e-mails and hacktools. Bait emails are a quite new tactic in malware spreading – you get the e-mail that mimics some routine notifications about shippings or bank service conditions updates. Inside of the e-mail, there is a corrupted 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.

Avoiding it looks fairly uncomplicated, however, still demands tons of focus. Malware can hide in different places, and it is better to prevent it even before it gets into your PC than to trust in an anti-malware program. Common cybersecurity awareness is just an essential item in the modern-day world, even if your relationship with a computer stays on YouTube videos. That can save you a lot of money and time which you would certainly spend while looking for a solution.

Trojan:Win32/Cosmu.AC!MTB malware technical details

File Info:

name: 3856A62F7B0660F44D0D.mlwpath: /opt/CAPEv2/storage/binaries/6816657f165ad38045dbca298b40e141a611f09086296979c43719ee2b74d9cecrc32: D4A8D2AEmd5: 3856a62f7b0660f44d0d52380819b1adsha1: e0684288f2945523a2969d742aeee67d5ad43ba6sha256: 6816657f165ad38045dbca298b40e141a611f09086296979c43719ee2b74d9cesha512: 01d26dbef7920139a59df046fdd121ba2735e645faeec4e0342da3cf80f6c5dcf83cadc68eea38debe49ec24e1d0fd7e55503c74a31ac9e0a94b02270a4681c1ssdeep: 768:uEaz5G7MaEtbwQpeyjaSLyfOPT4xcsrRA9Xu/IC4X3i2AH350azknSRXJuRWQlhw:v4GYUWeypTUuuQj635cSRU3iN/ntN7type: PE32 executable (GUI) Intel 80386, for MS Windowstlsh: T171433A87EE5D40D0E6155A30896D237DCAB7947E4B30EBAB5788DD3C2837480EC3A769sha3_384: e72ed52fee9f7b40eff0a646a07e1d330d0a3ed01bdc37fcec4cb461e55b298b16f49ab9bfc685e157e0f8936e242cafep_bytes: 558bec6aff68e0a5400068c886400064timestamp: 2007-10-23 12:03:54

Version Info:

Comments: CompanyName: FileDescription: System FileFileVersion: 2, 0, 0, 1InternalName: brdrLegalCopyright: Copyright (C) 2007LegalTrademarks: OriginalFilename: OmerPrivateBuild: ProductName: Browser DriverProductVersion: 2, 0, 0, 1SpecialBuild: Translation: 0x0409 0x04b0

Trojan:Win32/Cosmu.AC!MTB also known as:

Elastic malicious (high confidence)
MicroWorld-eScan Gen:Adware.Heur.dq1@IutA33ci
FireEye Generic.mg.3856a62f7b0660f4
CAT-QuickHeal Adware.Zenosearch.A4
Skyhigh BehavesLike.Win32.AdwareZeno.qm
McAfee Adware-Zeno.gen.b
Malwarebytes Generic.Malware.AI.DDS
Zillya Adware.ZenoSearch.Win32.200
Sangfor Suspicious.Win32.Save.ins
K7AntiVirus Adware ( 004ca0081 )
K7GW Adware ( 004ca0081 )
Cybereason malicious.8f2945
Arcabit Adware.Heur.EF40FE
VirIT Adware.Win32.ZenoSearch.AC
Symantec Downloader
ESET-NOD32 Win32/Adware.ZenoSearch
APEX Malicious
ClamAV Win.Adware.Zeno-4
Kaspersky Trojan-Ransom.Win32.PornoAsset.cwgx
BitDefender Gen:Adware.Heur.dq1@IutA33ci
NANO-Antivirus Riskware.Win32.ZenoSearch.lyap
Avast Win32:AdwareX-gen [Adw]
Tencent Malware.Win32.Gencirc.10b270da
Emsisoft Gen:Adware.Heur.dq1@IutA33ci (B)
F-Secure Adware:W32/ZenoSearch.AQ
DrWeb Adware.ZenoSearch
VIPRE Gen:Adware.Heur.dq1@IutA33ci
TrendMicro ADW_ZENOSEARC.BC
Sophos ZenoSearch (PUA)
Ikarus Trojan-Downloader
Jiangmin Adware/Agent.bdc
Webroot Adware.Zenosearchassistant
Google Detected
Avira TR/Downloader.Gen
Varist W32/ZenoSearch.A.gen!Eldorado
Antiy-AVL GrayWare[AdWare]/Win32.ZenoSearch
Xcitium Application.Win32.Adware.ZenoSearch@403u
Microsoft Trojan:Win32/Cosmu.AC!MTB
ZoneAlarm Trojan-Ransom.Win32.PornoAsset.cwgx
GData Gen:Adware.Heur.dq1@IutA33ci
Cynet Malicious (score: 100)
AhnLab-V3 Adware/Win32.ZenoSearch.R7597
BitDefenderTheta Gen:NN.ZexaF.36744.dq1@autA33ci
ALYac Gen:Adware.Heur.dq1@IutA33ci
MAX malware (ai score=68)
VBA32 AdWare.ZenoSearch
Cylance unsafe
Panda Adware/Zenosearch
TrendMicro-HouseCall ADW_ZENOSEARC.BC
Rising Trojan.Win32.Mnless.zwo (CLASSIC)
Yandex Trojan.GenAsa!wci/eCVeP1Q
SentinelOne Static AI – Malicious PE
MaxSecure Trojan.Malware.121218.susgen
Fortinet Adware/Zeno
AVG Win32:AdwareX-gen [Adw]
DeepInstinct MALICIOUS
CrowdStrike win/grayware_confidence_90% (W)

How to remove Trojan:Win32/Cosmu.AC!MTB?

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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