Office (OLE) malware analysis — malicious · d477fd690956ff99

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-27 11:47:04 Authoring application: Microsoft Excel

MD5: e5efdf2cf8cb32657c88333acefdb4d9 SHA-1: bfa23c7f3b7169851128be6952def96b09dfe59e SHA-256: d477fd690956ff998cbcaab600ef08fc8ff6d8dd5509d33dca1d6caaee718686

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 indicator of malicious intent. These macros are capable of executing dangerous functions, suggesting the file is designed to download and execute a secondary payload. The presence of XLM macros points to the T1059.005 (Visual Basic) technique, and the overall execution capability aligns with T1203 (Exploitation for Client Execution).

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` `fa8a81c1797a5c0d4078ffd6882c2fb2f7a10799da6cbe1e97f260aa1ee3275e`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6815 bytes

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