Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f1f1e8def51105de…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:43:21 Authoring application: Microsoft Excel
MD5: 4e85ef2d5fd9fdf69cd3f5b14ccc605f SHA-1: c2cf3782a13d1d412ff9b500200e6a14abe30356 SHA-256: f1f1e8def51105de34cf81192f6fdcc82f652d7f16ee60acdac7638d4ec8c757
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open macro, which is a critical indicator of malicious intent. This macro is designed to execute dangerous functions, suggesting it's intended to download and execute a secondary payload. The presence of an Auto_Open entry points to an attempt at automatic execution upon opening the document.

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
6c036f1e124d37488d6f522ac88f21f325d9e5a43ed3e57a3afd1afbeb9a088a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6599 bytes

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