Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c15a86a10ddeb4fd…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:52 Authoring application: Microsoft Excel
MD5: 60641aa74afcee9e2156bc1ccd023977 SHA-1: 291247da5eac4e9122e771b42afd14f0aa306d09 SHA-256: c15a86a10ddeb4fd30def0cfdbdb179ff85ee8d7017e72c281e0a434afc06fa9
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 function, which is a known method for executing malicious code within spreadsheets. The presence of dangerous formula APIs in the Auto_Open macro indicates a high likelihood of malicious intent, likely to download and execute a secondary 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
5e19a2a83f0a38a9e9c346cbdf40765c5f10a31b71614aa72ffff492850c451d		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6677 bytes

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