Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ac6105aaf6e4a11e…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:41:50 Authoring application: Microsoft Excel
MD5: 2a5ec4d94df054b3ab7cc77c9ca1bcc7 SHA-1: 5d52346c319f51fa2f1453831fb6685acbdd20f2 SHA-256: ac6105aaf6e4a11e005e5a9fb585cf07da1cd29a6fa46af199be55dd74d6b006
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 commands. While the exact payload is not discernible from the provided evidence, the technique strongly points to initial execution of a 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.

FilenameKindSourceSize
xlm_macros.txt
85ae4b1a27d43b1f94057a8b74606f21c10fb5476da4395cc59a80ff139ddba4		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6531 bytes

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