Office (OOXML) / .XLSX malware analysis — malicious · bfb37c9adc809e88

MALICIOUS

Office (OOXML) / .XLSX

37.9 KB Created: 2021-05-05 20:38:48 UTC Authoring application: Microsoft Excel 16.0300

MD5: 4bedb6631269e591cdfe5c981cd4d219 SHA-1: 46dfc240038bb75928ccc8153781a6b0e5957904 SHA-256: bfb37c9adc809e880f56dd10898b5425242330d6e2fa69e014a98e6dc18ce416

140 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The file is an Excel macro-enabled document containing a Workbook_Open macro, which is a common technique for initial execution. The presence of CreateObject calls and the extraction of VBA macros suggest the code attempts to download and execute a secondary payload. Without further analysis of the VBA code's specific actions or network indicators, the exact family remains unknown.

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` `bcffa12eda02ed537d05c64035bf1fbd95b7b6b5a0037b0f411dbfabd4b41c65`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3479 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `04aa5b22d853916ed02cd3b377e0c70db06885eb759a43a144889cc3573758ca`	vba-project	OOXML VBA project: xl/vbaProject.bin	22528 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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