Office (OLE) / .XLSX malware analysis — malicious · 5dd60fcbe20ee666

MALICIOUS

Office (OLE) / .XLSX

36.0 KB Created: 2020-11-27 11:46:53 Authoring application: Microsoft Excel

MD5: 98b5f61dc2614b8dda367589c035e2af SHA-1: 64b7dcc9ac626e9fb02a6994a5a1f07d08b450b6 SHA-256: 5dd60fcbe20ee6669eb9ebf07099e178138b0972071fc319a6d2b07be470b281

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 upon opening. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. This is a common technique for downloading and executing further malicious payloads.

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` `80663acbb14fc3437a2c1caf26689a1c722fc35a3403ea87676aa01719401f74`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6607 bytes

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