Office (OLE) / .XLS malware analysis — malicious · 5d4419f3d6f9fec1

MALICIOUS

Office (OLE) / .XLS

42.0 KB Created: 2020-09-28 00:53:43 Authoring application: Microsoft Excel

MD5: 7caf56d3c2c79f7522e6a7b3459a5359 SHA-1: c1218a6b2de70b6fdabb5e437239e602fe83b23b SHA-256: 5d4419f3d6f9fec1a27235e1acd597eebb8bcaa1ef22824e02831f7e5f0b42ac

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a known technique for executing malicious code upon opening the spreadsheet. The `RUN=0` formula API suggests the macro is designed to execute an external command. While no specific URLs or hashes were extracted, the Auto_Open macro is highly indicative of a downloader or initial execution stage for further malicious activity.

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` `6b091be3e9d7bb5084923d7e885ab16a5dae5e72ea5ddd1ae6ae41a027fa12ce`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	8132 bytes

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