Office (OLE) malware analysis — malicious · 236ec681d7fb2774

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:46:34 Authoring application: Microsoft Excel

MD5: db5685e587ed971276e1d420e80e99aa SHA-1: 979a0ce5408da121aa06799882b30ce60ed22353 SHA-256: 236ec681d7fb27749e9593e6e1a1c5dba4c9c6874e1af5dfd72ca61f5f634f8c

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-enabled workbook containing an Auto_Open function. This function is designed to execute automatically when the workbook is opened, and the presence of dangerous formula APIs indicates it is intended to run malicious code. The macro likely serves as a downloader for a secondary payload, although the specific payload and its destination are not discernible from the provided evidence.

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` `b3526578d7a744c3313a937b52af8239bb9f57051659849a1da6bd6bc5ea54ba`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6748 bytes

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