Office (OLE) malware analysis — malicious · bb7a5c55d2e20b65

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:45:34 Authoring application: Microsoft Excel

MD5: 26a21d98304edd22a7de98f141d02011 SHA-1: bc4f47e83ce481935fb96426b8f717d33f6e9c95 SHA-256: bb7a5c55d2e20b6523d4ee70c2d3e72be7d08fae454730ac28ba13ae6d5e1a13

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel 4.0 macro sheet containing 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, likely downloading and running a second-stage payload. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the macro content itself.

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` `2b986766737d71277833e04dcc78f339b8a0f962af7c1df46ba07d1e842364da`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6829 bytes

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