The STOP ransomware has been detected in new active attack campaigns by security researchers. This new variant appears to be set to use the extension .nobu for files it encrypts. That’s why the new variant is dubbed Nobu ransomware. The decryption key price varies in price and is usually given in Bitcoin. It depends on the time that has passed before the victim contacts hackers. Keep reading this Nobu ransomware removal guide to learn how to remove malicious files completely from the infected PC and potentially recover .nobu files.
Manual Removal Guide
Files Recovery Approaches
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Infection Flow of Nobu Ransomware Virus
Once the Nobu ransomware is installed on the computer it creates randomly named executable files in the %AppData% or %LocalAppData% folders. Infection with the newest STOP ransomware variant – Nobu virus starts the moment its payload is executed on the targeted host. The payload controls all malicious system modifications that aim to ensure the stable presence of Nobu ransomware on the computer. The Nobu file virus can read, update and delete some system files or create new malicious files in order to complete the infection.
Once Nobu file virus establishes all its files and objects on the infected host it initiates a scan of all drives and commonly encrypts all files that belong to one of the following types:
.001, .002, .003, .004, .005, .006, .007, .008, .009, .010, .011, .123, .1cd, .3dm, .3ds, .3fr, .3g2, .3gp, .3pr, .602, .7z, .7zip, .ARC, .CSV, .DOC, .DOT, .MYD, .MYI, .NEF, .PAQ, .PPT, .RTF, .SQLITE3, .SQLITEDB, .XLS, .aac, .ab4, .accdb, .accde, .accdr, .accdt, .ach, .acr, .act, .adb, .adp, .ads, .aes, .agdl, .ai, .aiff, .ait, .al, .aoi, .apj, .apk, .arw, .asc, .asf, .asm, .asp, .aspx, .asset, .asx, .avi, .awg, .back, .backup, .backupdb, .bak, .bank, .bat, .bay, .bdb, .bgt, .bik, .bin, .bkp, .blend, .bmp, .bpw, .brd, .bsa, .cdf, .cdr, .cdr3, .cdr4, .cdr5, .cdr6, .cdrw, .cdx, .ce1, .ce2, .cer, .cfg, .cgm, .cib, .class, .cls, .cmd, .cmt, .config, .contact, .cpi, .cpp, .cr2, .craw, .crt, .crw, .cs, .csh, .csl, .csr, .css, .csv, .d3dbsp, .dac, .das, .dat, .db, .db3, .db_journal, .dbf, .dbx, .dc2, .dch, .dcr, .dcs, .ddd, .ddoc, .ddrw, .dds, .der, .des, .design, .dgc, .dif, .dip, .dit, .djv, .djvu, .dng, .doc, .docb, .docm, .docx, .dot, .dotm, .dotx, .drf, .drw, .dtd, .dwg, .dxb, .dxf, .dxg, .edb, .eml, .eps, .erbsql, .erf, .exf, .fdb, .ffd, .fff, .fh, .fhd, .fla, .flac, .flf, .flv, .flvv, .forge, .fpx, .frm, .fxg, .gif, .gpg, .gray, .grey, .groups, .gry, .gz, .hbk, .hdd, .hpp, .html, .hwp, .ibank, .ibd, .ibz, .idx, .iif, .iiq, .incpas, .indd, .iwi, .jar, .java, .jnt, .jpe, .jpeg, .jpg, .js, .kc2, .kdbx, .kdc, .key, .kpdx, .kwm, .laccdb, .lay, .lay6, .lbf, .ldf, .lit, .litemod, .litesql, .log, .ltx, .lua, .m2ts, .m3u, .m4a, .m4p, .m4u, .m4v, .mapimail, .max, .mbx, .md, .mdb, .mdc, .mdf, .mef, .mfw, .mid, .mkv, .mlb, .mml, .mmw, .mny, .moneywell, .mos, .mov, .mp3, .mp4, .mpeg, .mpg, .mrw, .ms11, .msg, .myd, .n64, .nd, .ndd, .ndf, .nef, .nk2, .nop, .nrw, .ns2, .ns3, .ns4, .nsd, .nsf, .nsg, .nsh, .nvram, .nwb, .nx2, .nxl, .nyf, .oab, .obj, .odb, .odc, .odf, .odg, .odm, .odp, .ods, .odt, .ogg, .oil, .onetoc2, .orf, .ost, .otg, .oth, .otp, .ots, .ott, .p12, .p7b, .p7c, .pab, .pages, .pas, .pat, .pcd, .pct, .pdb, .pdd, .pdf, .pef, .pem, .pfx, .php, .pif, .pl, .plc, .plus_muhd, .png, .pot, .potm, .potx, .ppam, .pps, .ppsm, .ppsx, .ppt, .pptm, .pptx, .prf, .ps, .psafe3, .psd, .pspimage, .pst, .ptx, .pwm, .py, .qba, .qbb, .qbm, .qbr, .qbw, .qbx, .qby, .qcow, .qcow2, .qed, .r3d, .raf, .rar, .rat, .raw, .rb, .rdb, .re4, .rm, .rtf, .rvt, .rw2, .rwl, .rwz, .s3db, .safe, .sas7bdat, .sav, .save, .say, .sch, .sd0, .sda, .sdf, .sh, .sldm, .sldx, .slk, .sql, .sqlite, .sqlite3, .sqlitedb, .sr2, .srf, .srt, .srw, .st4, .st5, .st6, .st7, .st8, .stc, .std, .sti, .stm, .stw, .stx, .svg, .swf, .sxc, .sxd, .sxg, .sxi, .sxm, .sxw, .tar, .tar.bz2, .tbk, .tex, .tga, .tgz, .thm, .tif, .tiff, .tlg, .txt, .uop, .uot, .upk, .vb, .vbox, .vbs, .vdi, .vhd, .vhdx, .vmdk, .vmsd, .vmx, .vmxf, .vob, .wab, .wad, .wallet, .wav, .wb2, .wk1, .wks, .wma, .wmv, .wpd, .wps, .x11, .x3f, .xis, .xla, .xlam, .xlc, .xlk, .xlm, .xlr, .xls, .xlsb, .xlsm, .xlsx, .xlt, .xltm, .xltx, .xlw, .xml, .ycbcra, .yuv, .zip
All target files are modified via the strong cipher algorithm AES. The encryption process transforms the original code of target files by making them completely unworkable until the decryption key is applied to the decryptor. Then Nobu ransomware renames encrypted files and marks them with the .nobu file extension.
The Nobu virus also loads Windows Registry editor to create new registry values under keys like Run and RunOnce that will help the automatic execution of its payload each time the Windows OS starts. Furthermore, some values under the same keys may be deleted or replaced so that the ransomware can generate its ransom note automatically on the screen. Before this Nobu files virus drops the file that contains its ransom message.
The Nobu ransomware is designed to localize the infected host so it can present the ransom message in the appropriate language. The message provides two addresses that enable victims to contact hackers for further details about the ransom amount and its payment. The STOP Nobu ransomware malicious operators attempt to blackmail their victims into paying a ransom fee. They demand the amount in Bitcoins. Supposedly, the payment process should enable infected users to restore their .nobu files.
However, there is no guarantee that they will send a working decryption tool even after an eventual successful payment. If you want to regain the security of your PC and retrieve .nobu files, check the removal guide below and follow the steps.
Nobu Ransomware Distribution
The Nobu ransomware is distributed mainly via spam email messages that follow a typical pattern of sending legitimate alike blank emails with malicious attachments. The Nobu virus infected emails contain malicious files archived in .7z format that generally are presented as “Status of invoice”. The email may also be presented as information about package delivery failure or notifications of shipment status. These techniques aim to provoke curiosity and interaction with the attached file. Spreading ransomware through archives is a staple of this type of malware. The attached file contains a malicious VBS file that once opened triggers the Nobu ransomware infection. Other distribution techniques may be browser hijackers, malicious ads and redirects and dangerous software installation packages downloaded from untrusted sites.
Remove Nobu Ransomware and Restore PC
Please note that paying the requested ransom fee to cybercriminals does not really solve your problem with Nobu cryptovirus. In fact, you only encourage hackers to continue spreading ransomware of this kind. Instead, you must remove the threat immediately, and only then look for optional ways to recover your data.
WARNING! Manual removal of Nobu ransomware requires being familiar with system files and registries. Removing important data accidentally can lead to permanent system damage. If you don’t feel comfortable with manual instructions, download a powerful anti-malware tool that will scan your system for malware and clean it safely for you.DOWNLOAD SpyHunter Anti-Malware Tool
Nobu Ransomware Virus – Manual Removal Steps
Start the PC in Safe Mode with Network
This will isolate all files and objects created by the ransomware so they will be removed efficiently. The steps below are applicable to all Windows versions.
1. Hit the WIN Key + R
2. A Run window will appear. In it, write msconfig and then press Enter
3. A Configuration box shall appear. In it Choose the tab named Boot
4. Mark Safe Boot option and then go to Network under it to tick it too
5. Apply -> OK
Show Hidden Files
Some ransomware threats are designed to hide their malicious files in the Windows so all files stored on the system should be visible.
1. Open My Computer/This PC
2. Windows 7
- – Click on Organize button
– Select Folder and search options
– Select the View tab
– Go under Hidden files and folders and mark Show hidden files and folders option
3. Windows 8/ 10
- – Open View tab
– Mark Hidden items option
4. Click Apply and then OK button
Enter Windows Task Manager and Stop Malicious Processes
1. Hit the following key combination: CTRL+SHIFT+ESC
2. Get over to Processes
3. When you find suspicious process Nobut click on it and select Open File Location
4. Go back to Task Manager and end the malicious process. Nobut click on it again and choose End Process
5. Next, you should go folder where the malicious file is located and delete it
Repair Windows Registry
1. Again type simultaneously the WIN Key + R key combination
2. In the box, write regedit and hit Enter
3. Type the CTRL+ F and then write the malicious name in the search type field to locate the malicious executable
4. In case you have discovered registry keys and values related to the name, you should delete them, but be careful not to delete legitimate keys
Click for more information about Windows Registry and further repair help
Recover Encrypted Files
WARNING! All files and objects associated with Nobu ransomware virus should be removed from the infected PC before any data recovery attempts. Otherwise the virus may encrypt restored files. Furthermore, a backup of all encrypted files stored on external media is highly recommendable.
1. Use present backups
2. Use professional data recovery software
Stellar Phoenix Data Recovery – a specialist tool that can restore partitions, data, documents, photos, and 300 more file types lost during various types of incidents and corruption.
3. Using System Restore Point
- – Hit WIN Key
– Select “Open System Restore” and follow the steps
4. Restore your personal files using File History
- – Hit WIN Key
– Type restore your files in the search box
– Select Restore your files with File History
– Choose a folder or type the name of the file in the search bar
– Hit the “Restore” button