Office (OLE) malware analysis — malicious · da89c8f800d391b7

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:43 Authoring application: Microsoft Excel

MD5: 0ed7cc0eea27802f94802f662b745906 SHA-1: 04aeeb4d047b1e1dfa9ea858aa27aebf1ecfb8f0 SHA-256: da89c8f800d391b760a548f29bf0e811382992eb44c8c6fa55db2567c67ca2bf

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 macro sheet also utilizes dangerous formula APIs, specifically the RUN function, suggesting it is designed to execute arbitrary commands. This points to a downloader or dropper functionality, where the macro is used to fetch and execute a secondary malicious payload.

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` `7e216455cd54a0e365a2b27495041d9280b0ecaca64e88701481ac15ba2f3344`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6679 bytes

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