Office (OLE) malware analysis — malicious · 3bf7252a6191d1d3

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:41:43 Authoring application: Microsoft Excel

MD5: e662f8d3c2ba3ae99816c0feda11dd88 SHA-1: 6d18e7d8c90877d74429f0d1555b3fe93d49a78e SHA-256: 3bf7252a6191d1d3df3fff9a2bf8c6b6adcdee52d6b09fd6dd17e1bf91f4e2fa

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 defined name, which is a known technique for executing arbitrary code. The `RUN=0` formula API suggests the macro is designed to execute a command or launch a process. While no specific URLs or hashes were extracted, the Auto_Open macro is highly indicative of a downloader or initial execution stage for a more complex attack.

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` `63c0a06fe93f3417c63d18a5eb14bc806f1bb03c00fa89a2d51efa8c9860d336`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6540 bytes

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