Office (OOXML) / .XLSX malware analysis — malicious · cbae5afb602d7aab

MALICIOUS

Office (OOXML) / .XLSX

17.9 KB Created: 2021-07-05 10:06:26 UTC Authoring application: Microsoft Excel 15.0300

MD5: 3dd1f137919bc0c5ea0f24b67bd1a79e SHA-1: 297f9bd46bbc19a8b431588d6dd4994c8774f447 SHA-256: cbae5afb602d7aab2b05d74c52e2477d381296053ccf6446fb983745ddcc08e7

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.001 PowerShell

The file is an Excel document containing a Workbook_Open macro, indicating an attempt to execute code upon opening. The macro contains obfuscated VBA code that reconstructs the string 'powershell.exe' and likely executes it. This suggests a downloader or initial execution stage for a more complex attack. The presence of a Workbook_Open macro and VBA code points to a macro-based attack, commonly used for initial access.

Heuristics 4

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `f1af48e578960b6a8df5667bf1ba63afb030de5f5f329b5e32d9e401201baf26`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	7578 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `3f119f817290093e317b3f748a22cbdc174dd766ee4dace9fb15b5c32824abea`	vba-project	OOXML VBA project: xl/vbaProject.bin	23552 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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