Office (OLE) malware analysis — malicious · 507f613ace33ad5f

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:18 Authoring application: Microsoft Excel

MD5: 045f00027ef5f41c2992bc89f2beba49 SHA-1: a8462a2a000cd41817a67d1a8b257f69125bb033 SHA-256: 507f613ace33ad5f797a8a9fca20a5d3a43b9142c340ac195a061a4ffb850f9c

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel document containing Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a known method for executing malicious code upon opening. The critical heuristic firings indicate the presence of dangerous formula APIs within the XLM macro, suggesting an attempt to run arbitrary commands or download further payloads. No specific family could be identified due to the generic nature of the macro execution.

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` `a282e62e23ec6884bf40f08ee205e7902bb0ec8d0d52c0d5b400a8d2d9e2185b`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6707 bytes

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