Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 51b8cd3027c744e9…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:26 Authoring application: Microsoft Excel
MD5: 3e2a0e0bb4de4df9d8007605bdfa418a SHA-1: 290c604a59c1e045b9432014f7e8e8d73b46ad69 SHA-256: 51b8cd3027c744e9341130c4e11e8b6137ac049f92fb86f0cda44addf513157a
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 indicator of malicious intent. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. The obfuscated document body further supports the malicious nature of the file, likely acting as a downloader or initial execution vector.

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
4843a14034fbabc7ffa00fb68c066a7ffe55b5b98dc9ba61d473c18d6e8b7ffb		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6746 bytes

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