fantom-header

Last week, BleepingComputer reported about a new ransomware that uses a fake Windows Update screen while it encrypts your files. This new ransomware is called Fantom Ransomware and it was discovered by an AVG malware researcher.

The ransomware will install an executable program named ‘a.exe.’ To cloak its malicious activity, the file’s properties state that it contains a ‘critical update’ for Windows Update. A 2016 copyright from Microsoft is even written. Once the program is executed, it will extract and run another application under the name ‘WindowsUpdate.exe.’ This will display what looks like a screen configuring Windows Updates, complete with a percentage meter, and a reminder not to turn off the PC. The screen is designed to look like the ones many go through to install legitimate updates, in order to make victims think that there is nothing wrong going on. Once it is displayed, the program will not let the user switch applications.

Windows-Update-Fantom-Ransomware-696x379

As the screen pretends to ‘configure Windows Updates,’ it is silently encrypting files in the background like other ransomware variants. Once done, it will generate a random AES-128 key, which will be uploaded to the malware’s Command & Control (C&C) server. It targets a wide number of file extensions, where a ‘.fantom’ file extension will be appended to.

Lastly, it will open an HTML file similar to this:

html-ransom-note

Finally, the ransomware will download an image from and save it to %UserProfile%2d5s8g4ed.jpg. This image is downloaded from the following URL, which may provide a clue as to the developer’s identity:

http://content.screencast.com/users/Gurudrag/folders/Default/media/9289aabe-7b4a-4c7f-b3bb-bdf3407e7a2f/fantom1.jpg

This image will then be used as the Windows wallpaper shown below.

wallpaper

Unfortunately, there is no known method to decrypt files locked up by the Fantom ransomware. If a method is found, I will update this article with a walkthrough.

Infection References

Files created by the Fantom Ransomware:

%AppData%delback.bat

[Executable_Path]WindowsUpdate.exe[Executable_Path]update.bat
%UserProfile%2d5s8g4ed.jpg

Registry entries created by the Fantom Ransomware:

HKCUControl PanelDesktop “Wallpaper” “%UserProfile%How to decrypt your files.jpg”
HKCUSoftwareMicrosoftWindowsCurrentVersionPoliciesSystem “DisableTaskMgr” = 1

Network Communication:

http://powertoolsforyou.com/themes/prestashop/cache/stats.php
http://templatesupdates.dlinkddns.com/falssk/fksgieksi.php

Hashes:

SHA256: f4234a501edcd30d3bc15c983692c9450383b73bdd310059405c5e3a43cc730b

Targeted File Extensions:

.001, .1cd, .3d, .3d4, .3df8, .3fr, .3g2, .3gp, .3gp2, .3mm, .7z, .aac, .abk, .abw, .ac3, .accdb, .ace, .act, .ade, .adi, .adpb, .adr, .adt, .ai, .aim, .aip, .ais, .amf, .amr, .amu, .amx, .amxx, .ans, .ap, .ape, .api, .apk, .arc, .arch00, .ari, .arj, .aro, .arr, .arw, .asa, .asc, .ascx, .ase, .asf, .ashx, .asmx, .asp, .aspx, .asr, .asset, .avi, .avs, .bak, .bar, .bay, .bc6, .bc7, .bck, .bdp, .bdr, .bib, .bic, .big, .bik, .bkf, .bkp, .blob, .blp, .bmc, .bmf, .bml, .bmp, .boc, .bp2, .bp3, .bpl, .bsa, .bsp, .cag, .cam, .cap, .car, .cas, .cbr, .cbz, .cc, .ccd, .cch, .cd, .cdr, .cer, .cfg, .cfr, .cgf, .chk, .clr, .cms, .cod, .col, .cp, .cpp, .cr2, .crd, .crt, .crw, .cs, .csi, .cso, .css, .csv, .ctt, .cty, .cwf, .d3dbsp, .dal, .dap, .das, .dayzprofile, .dazip, .db0, .dbb, .dbf, .dbfv, .dbx, .dcp, .dcr, .dcu, .ddc, .ddcx, .dem, .der, .desc, .dev, .dex, .dic, .dif, .dii, .dir, .disk, .divx, .diz, .djvu, .dmg, .dmp, .dng, .dob, .doc, .docm, .docx, .dot, .dotm, .dotx, .dox, .dpk, .dpl, .dpr, .dsk, .dsp, .dvd, .dvi, .dvx, .dwg, .dxe, .dxf, .dxg, .elf, .epk, .eps, .eql, .erf, .err, .esm, .euc, .evo, .ex, .exif , .f90, .faq, .fcd, .fdr, .fds, .ff, .fla, .flac, .flp, .flv, .for, .forge, .fos, .fpk, .fpp, .fsh, .gam, .gdb, .gho, .gif, .grf, .gthr, .gz, .gzig, .gzip, .h3m, .h4r, .hkdb, .hkx, .hplg, .htm, .html, .hvpl, .ibank, .icxs, .idx, .ifo, .img, .indd, .ink, .ipa, .isu, .isz, .itdb, .itl, .itm, .iwd, .iwi, .jar, .jav, .java, .jc, .jfif, .jgz, .jif, .jiff, .jpc, .jpe, .jpeg, .jpf, .jpg, .jpw, .js, .json, .kdb, .kdc, .kf, .kmz, .kwd, .kwm, .layout, .lbf, .lbi, .lcd, .lcf, .ldb, .lgp, .litemod, .log, .lp2, .lrf, .ltm, .ltr, .ltx, .lvl, .m2, .m2v, .m3u, .m4a, .mag, .man, .map, .max, .mbox, .mbx, .mcd, .mcgame, .mcmeta, .md, .md3, .mdb, .mdbackup, .mddata, .mdf, .mdl, .mdn, .mds, .mef, .menu, .mic, .mip, .mkv, .mlx, .mod, .mov, .moz, .mp3, .mp4, .mpeg, .mpg, .mpqge, .mrw, .mrwref, .msg, .msp, .mxp, .nav, .ncd, .ncf, .nds, .nef, .nfo, .now, .nrg, .nri, .nrw, .ntl, .odb, .odc, .odf, .odi, .odm, .odp, .ods, .odt, .odtb .oft, .oga, .ogg, .opf, .orf, .owl, .oxt, .p12, .p7b, .p7c, .pab, .pak, .pbf, .pbp, .pbs, .pcv, .pdd, .pdf, .pef, .pem, .pfx, .php, .pkb, .pkh, .pkpass, .pl, .plc, .pli, .pm, .png, .pot, .potm, .potx, .ppd, .ppf, .pps, .ppsm, .ppsx, .ppt, .pptm, .pptx, .prc, .prt, .psa, .psd, .psk, .pst, .ptx, .puz, .pwf, .pwi, .pwm, .pxp, .py, .qbb, .qdf, .qel, .qic, .qif, .qpx, .qtq, .qtr, .r3d, .ra, .raf, .rar, .raw, .rb, .re4, .res, .rev, .rgn, .rgss3a, .rim, .rng, .rofl, .rrt, .rsrc, .rsw, .rte, .rtf, .rts, .rtx, .rum, .run, .rv, .rw2, .rwl, .sad, .saf, .sav, .sb, .sc2save, .scm, .scn, .scx, .sdb, .sdc, .sdn, .sds, .sdt, .sen, .sfs, .sfx, .sh, .shar, .shr, .shw, .sid, .sidd, .sidn, .sie, .sis, .slm, .sln, .slt, .snp, .snx, .so, .spr, .sql, .sqx, .sr2, .srf, .srt, .srw, .ssa, .std, .stt, .stx, .sud, .sum, .svg, .svi, .svr, .swd, .swf, .syncdb, .t12, .t13, .tar, .tax, .tax2015, .tax2016, .tbz2, .tch, .tcx, .text, .tg, .thmx, .tif, .tlz, .tor, .tpu, .tpx, .trp, .tu, .tur, .txd, .txf, .txt, .uax, .udf, .umx, .unity3d, .unr, .unx, .uop, .upk, .upoi, .url, .usa, .usx, .ut2, .ut3, .utc, .utx, .uvx, .uxx, .val, .vc, .vcd, .vdf, .vdo, .ver, .vfs0, .vhd, .vmf, .vmt, .vob, .vpk, .vpp_pc, .vsi, .vtf, .w3g, .w3x, .wad, .war, .wav, .wave, .waw, .wb2, .wbk, .wdgt, .wks, .wm, .wma, .wmd, .wmdb, .wmmp, .wmo, .wmv, .wmx, .wotreplay, .wow, .wpd, .wpk, .wpl, .wps, .wsh, .wtd, .wtf, .wvx, .x3f, .xf, .xl, .xla, .xlam, .xlc, .xlk, .xll, .xlm, .xlr, .xls, .xlsb, .xlsm, .xlsx, .xltx, .xlv, .xlwx, .xml, .xpi, .xpt, .xvid, .xwd, .xxx, .yab, .yps, .z02, .z04, .zap, .zip, .zipx, .zoo, .ztmp