Locky Ransomware Applies the .ODIN Extension to Encrypted Files

A brand new version of Locky Ransomware was found today by @dvk01uk. The most peculiar thing about the new ransomware variant is that it switches from the .ZEPTO extension to the.ODIN extension for encrypted files.

Apart from the above-mentioned, it is important to point out that if you are infected with this version of ransomware, you are not infected with the Odin Ransomware. Actually, you are infected by Locky, which is using the .ODIN extension now.

Similarly to the old Locky versions, the new sample is being distributed through WS, JS, etc, or email attachments attached to SPAM emails. When a recipient double-clicks on one of these script files, it will download an encrypted DLL installer, decrypt it, and execute it using the legitimate Windows program, named Rundll32.exe.

The command which is executed to launch the DLL is: rundll32.exe %Temp%\[name_of_dll],qwerty

Being executed, Locky ransomware encrypts a victim’s files, rename them, and append the .ODIN extension after that. For instance, test.jpg may be renamed as 5FBZ55IG-S575-7GEF-2C7B-5B22862C2225.odin.

Nevertheless, you should be aware that the names of the ransom note might have already changed.

The ransom notes that are created by the current version are _HOWDO_text.html, _HOWDO_text.bmp, and _[2_digit_number]_HOWDO_text.html.

A list of the extensions targeted for encryption by the new Locky version is provided bellow:

.yuv, .ycbcra, .xis, .wpd, .tex, .sxg, .stx, .srw, .srf, .sqlitedb, .sqlite3, .sqlite, .sdf, .sda, .s3db, .rwz, .rwl, .rdb, .rat, .raf, .qby, .qbx, .qbw, .qbr, .qba, .psafe3, .plc, .plus_muhd, .pdd, .oth, .orf, .odm, .odf, .nyf, .nxl, .nwb, .nrw, .nop, .nef, .ndd, .myd, .mrw, .moneywell, .mny, .mmw, .mfw, .mef, .mdc, .lua, .kpdx, .kdc, .kdbx, .jpe, .incpas, .iiq, .ibz, .ibank, .hbk, .gry, .grey, .gray, .fhd, .ffd, .exf, .erf, .erbsql, .eml, .dxg, .drf, .dng, .dgc, .des, .der, .ddrw, .ddoc, .dcs, .db_journal, .csl, .csh, .crw, .craw, .cib, .cdrw, .cdr6, .cdr5, .cdr4, .cdr3, .bpw, .bgt, .bdb, .bay, .bank, .backupdb, .backup, .back, .awg, .apj, .ait, .agdl, .ads, .adb, .acr, .ach, .accdt, .accdr, .accde, .vmxf, .vmsd, .vhdx, .vhd, .vbox, .stm, .rvt, .qcow, .qed, .pif, .pdb, .pab, .ost, .ogg, .nvram, .ndf, .m2ts, .log, .hpp, .hdd, .groups, .flvv, .edb, .dit, .dat, .cmt, .bin, .aiff, .xlk, .wad, .tlg, .say, .sas7bdat, .qbm, .qbb, .ptx, .pfx, .pef, .pat, .oil, .odc, .nsh, .nsg, .nsf, .nsd, .mos, .indd, .iif, .fpx, .fff, .fdb, .dtd, .design, .ddd, .dcr, .dac, .cdx, .cdf, .blend, .bkp, .adp, .act, .xlr, .xlam, .xla, .wps, .tga, .pspimage, .pct, .pcd, .fxg, .flac, .eps, .dxb, .drw, .dot, .cpi, .cls, .cdr, .arw, .aac, .thm, .srt, .save, .safe, .pwm, .pages, .obj, .mlb, .mbx, .lit, .laccdb, .kwm, .idx, .html, .flf, .dxf, .dwg, .dds, .csv, .css, .config, .cfg, .cer, .asx, .aspx, .aoi, .accdb, .7zip, .xls, .wab, .rtf, .prf, .ppt, .oab, .msg, .mapimail, .jnt, .doc, .dbx, .contact, .mid, .wma, .flv, .mkv, .mov, .avi, .asf, .mpeg, .vob, .mpg, .wmv, .fla, .swf, .wav, .qcow2, .vdi, .vmdk, .vmx, .wallet, .upk, .sav, .ltx, .litesql, .litemod, .lbf, .iwi, .forge, .das, .d3dbsp, .bsa, .bik, .asset, .apk, .gpg, .aes, .ARC, .PAQ, .tar.bz2, .tbk, .bak, .tar, .tgz, .rar, .zip, .djv, .djvu, .svg, .bmp, .png, .gif, .raw, .cgm, .jpeg, .jpg, .tif, .tiff, .NEF, .psd, .cmd, .bat, .class, .jar, .java, .asp, .brd, .sch, .dch, .dip, .vbs, .asm, .pas, .cpp, .php, .ldf, .mdf, .ibd, .MYI, .MYD, .frm, .odb, .dbf, .mdb, .sql, .SQLITEDB, .SQLITE3, .pst, .onetoc2, .asc, .lay6, .lay, .ms11 (Security copy), .sldm, .sldx, .ppsm, .ppsx, .ppam, .docb, .mml, .sxm, .otg, .odg, .uop, .potx, .potm, .pptx, .pptm, .std, .sxd, .pot, .pps, .sti, .sxi, .otp, .odp, .wks, .xltx, .xltm, .xlsx, .xlsm, .xlsb, .slk, .xlw, .xlt, .xlm, .xlc, .dif, .stc, .sxc, .ots, .ods, .hwp, .dotm, .dotx, .docm, .docx, .DOT, .max, .xml, .txt, .CSV, .uot, .RTF, .pdf, .XLS, .PPT, .stw, .sxw, .ott, .odt, .DOC, .pem, .csr, .crt, .key

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