Office (OLE) / .XLSX malware analysis — malicious · 7213970560b6651f

MALICIOUS

Office (OLE) / .XLSX

36.5 KB Created: 2020-11-27 11:38:42 Authoring application: Microsoft Excel

MD5: 0cf127f7b1effa31952712ddc7c55804 SHA-1: 5a275052ad8e7673d7ae2b49aea89d129f9d5c09 SHA-256: 7213970560b6651fc069c47622f6b1c36658d4731ec0f21f0607a5722533740a

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding indicating automatic execution of code. The presence of dangerous formula APIs within the XLM macro further increases the risk. While the exact payload is not discernible from the provided evidence, the Auto_Open function strongly suggests an attempt to execute arbitrary code upon opening the spreadsheet.

Heuristics 3

Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME

oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN

Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN

Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `60818dfabe03c74e9d077233dbad3b47560aa7276f3cc5d4f406b14daecd5628`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6624 bytes

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