Office (OLE) malware analysis — malicious · 55248de4bbfbf72f

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:45:41 Authoring application: Microsoft Excel

MD5: a199ccc72e40e5525c0c265d9e18a998 SHA-1: 424c50394196814bcee5fd42a7e442b385f43773 SHA-256: 55248de4bbfbf72f43f6c8555ade963815c0f6a843ac4bc7d7eff0118f693857

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically 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. While the exact payload is not visible, this setup is typical for downloading and executing a second-stage malware. No specific family could be identified.

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` `a7ad0a4d1d43bc4faa46aaad58ce75a3d7b30ef077ec0245590e215e69fbe04a`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6452 bytes

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