Office (OLE) / .XLS malware analysis — malicious · 0be53050492d8c9c

MALICIOUS

Office (OLE) / .XLS

31.0 KB Created: 2021-01-20 13:15:03 Authoring application: Microsoft Excel

MD5: 70e243c4f55f410fcd73d22708409176 SHA-1: 6a6c46cf50615e58a8fe8ef78231752a1323754b SHA-256: 0be53050492d8c9cecc16b522054270f6c9a965a2f2f63704492e1836e285ddb

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel spreadsheet containing Excel 4.0 macros, specifically an Auto_Open macro. This macro is configured to execute dangerous formula APIs, indicating an attempt to run arbitrary code. The specific payload executed by the macro is not directly visible in the provided evidence, but the presence of Auto_Open and dangerous functions strongly suggests a malicious intent to execute a secondary stage.

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` `aacd007274e22f86220e6d225487fc6a24fcd4a494392913685319aca44bf0cc`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	3464 bytes

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