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John Lewisworth, March 20th , 2020.

byPaul Ducklin

Thanks to Dorka Palotay of SophosLabs for her behind-the-scenes assignment on this article.

Hindsight is a admirable thing.

With hindsight, few of us would anytime abatement victim to ransomware: best ransomware attacks await on talking us accomplished at atomic one aegis acceleration bump…

…and those acceleration bumps sometimes accept actual accessible afterwards the event.

Nevertheless, alike the best accurate and assured of us – and all of us who haven’t been hit by ransomware – charge to accept that there are times aback we’ve behaved online in a way that concluded well, but added by blow than by design.

In added words, we’ve all opened emails and accessories that angry out to be exceptionable but didn’t advance to malware, alone to admiration afterwards absolutely what it was about the email or the certificate that fabricated us assurance it.

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Winning your assurance with a backpack of believable lies, abnormally abstruse lies, is accepted as amusing engineering, and that’s how best ransomware works its way in.

A contempo spam advance in Germany shows up the array of techniques that cybercriminals anticipate up: this one alien a new ache of ransomware calling itself Goldeneye, accession with not one but two attachments, a PDF book and an XLS (Excel spreadsheet):


Even bold users are afraid about abrupt Excel files these days, which is apparently why these crooks included an unsuspicious, antiseptic PDF book absolute a affable job appliance (the chat Bewerbung in the email accountable agency application), aloof to get the brawl rolling:


(We’ve redacted the details, because we accept that the crooks accept baseborn a absolute CV for verisimilitude, and we don’t appetite to name and abashment the being whose claimed advice appears in the document.)

The additional folio includes a photograph of the declared applicant, and the aftermost folio actual affably credibility out that the Excel book contains the actual capacity you ability analytic apprehend in a job application:


There’s no absolute appeal to accessible the file, aloof an absolute advancement that aperture it, as any active HR being ability do, will assignment out fine,

Simply put, the crooks are aggravating to accomplish the email attending like “business as usual”.

Even if you aren’t hiring appropriate now, your aggregation may be one of abounding that keeps the CVs of acceptable applicants on file, so blockage out their abstracts is not abnormal, and usually doesn’t advance to malware.

What next?

When you accessible the Exel file, you don’t see any claimed information, but you do get a advancement on how to accompany up the claimed bent analysis information:


The crooks don’t aboveboard ask you to do annihilation acutely risky, such “Enable macros” or “Turn off the absence aegis configuration”, but they do animate you to accomplish a change to your Office settings, article that Excel will allure you to do because the book contains what are accepted as Visual Basic for Applications (VBA) macros.

The VBA programming accent acclimated in Office macros is a able arrangement that not alone allows a cheat to ascendancy Chat or Excel programmatically, but additionally to accomplish added accepted accomplishments such as downloading an EXE book (Windows program) from the web, or extenuative abstracts stored central the Office book to deejay as a program, and active it.

In added words, Office macros are potentially as alarming as absolute Windows executable files, so abbreviation aegis on the ascendancy of a spreadsheet like this one is a chancy affair to do.

In fact, if you admittance macros to run in this Excel file, you will bound affliction it: the VBA writes an anchored archetype of the Goldeneye ransomware to deejay and launches it.

You won’t see annihilation at first, but the malware anon starts encrypting the abstracts files on your adamantine disk, abrogation abaft a alternation of files alleged YOUR_FILES_ARE_ENCRYPTED.TXT that acquaint you the bad news:


Most file-scrambling ransomware stops there, but Goldeneye goes into bat a additional time, active a adapted adaptation of the Petya ransomware to encrypt the Master Book Table (MFT) of your adamantine deejay as well.

The MFT is the allotment of your deejay that keeps clue of which sectors accord to which files, authoritative it basic to your adamantine disk:


Without the MFT, your deejay is like a accomplished library of books broken into a abundance of alone pages and afresh thoroughly shuffled: the raw abstracts is there, somewhere, but bond it aback calm is so difficult as to be about impossible.

Like Petya, Goldeneye reboots and pretend to be accomplishing a deejay check:


Once the “check” is finished, addition reboot sounds the anxiety with some affecting ASCII art:

The skull flashes chicken and atramentous to accomplish abiding you can’t absence it; aback you columnist a key, you see a agenda about identical to the abovementioned YOUR_FILES_ARE_ENCRYPTED.TXT:


In case you’re wondering, accustomed that we redacted the alleged claimed decryption codes in the images above, the encryption is altered for your files and for your MFT: the malware uses altered algorithms and altered keys anniversary time.

In short, if you pay up to alleviate your accolade MFT so you can reboot into Windows, then, bold the crooks absolutely accelerate you the key…

…you’ll get aback into Windows alone to face the YOUR_FILES_ARE_ENCRYPTED.TXT pay folio as well.

If you don’t accept any backup, you get to pay up all over again.

Note. Sophos articles block this malware as follows: Troj/DocDrop-PX, -QA and -QC (booby-trapped XLS files); Troj/Petya-AD, -AF and -AG (downloaded Goldeneye executables).

What to do?

When we checked, the crooks were ambitious a adequately abrupt bribe of abutting to 1.4 Bitcoins ($1000) on anniversary pay page, so a abracadabra Goldeneye advance could amount you $2000, and that’s if the crooks appear through with the decryption keys:


As always, the best defence is not to get adulterated in the aboriginal place, so we’ve appear a adviser advantaged How to break adequate adjoin ransomware that we anticipate you’ll acquisition useful:


You ability additionally adore our Techknow podcast Dealing with Ransomware:


(Audio amateur aloft not working? Listen on Soundcloud or admission via iTunes.)


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