Office (OOXML) / .XLSX malware analysis — malicious · 2d4f09faf4e05143

MALICIOUS

Office (OOXML) / .XLSX

18.6 KB Created: 2021-06-25 03:36:50 UTC Authoring application: Microsoft Excel 16.0300

MD5: 25f54ea5ad76cf19f44fee995d489779 SHA-1: f036aa9ebf5f76b62c067b4fa1f7d23d947cc655 SHA-256: 2d4f09faf4e05143af1a25073ae60599cf10f9954f3157eea49493aa76e5f310

162 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a macro-enabled Excel document containing a Workbook_Open macro that utilizes the Shell() function to execute code. The VBA script is heavily obfuscated, making it difficult to determine the exact payload or its destination. However, the presence of the Workbook_Open macro and the Shell() call strongly indicate an attempt to download and execute a secondary payload. The extracted artifacts 'macros.bas' and 'vbaProject_00.bin' are directly related to the macro execution.

Heuristics 5

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://schemas.openxmlformats.org/spreadsheetml/2006/main
- http://schemas.openxmlformats.org/officeDocument/2006/relationships
- http://schemas.openxmlformats.org/markup-compatibility/2006
- http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
- http://schemas.microsoft.com/office/spreadsheetml/2014/revision
- http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `b30c5f7874359c860d73408cd84dc468e17e4cf0577bca693d9870bc1f403875`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	7748 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` `cc9035b0d093f2690c495a0a37bcf1e2536365610e07ffbe8a7e9aa9fec9c272`	vba-project	OOXML VBA project: xl/vbaProject.bin	25088 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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