Office (OLE) malware analysis — malicious · 432cebccecceaabb

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:46:37 Authoring application: Microsoft Excel

MD5: 59a0e50522a04f35675c5b45f93b4133 SHA-1: 72ff67f083e14227002d8e340c834a7c8bff2135 SHA-256: 432cebccecceaabb348628f2ea339f680fbc6c8a7bfbb1d9fc549d205b07790b

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 entry, 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 a downloader for a secondary payload. No specific family could be identified, and no direct IOCs like URLs or hashes were extracted from the macro 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` `200e60ac73e340074e27da192998640406b6749394d7ee270075a4ea1c5750c8`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6682 bytes

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