Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d6d5f8738cd65403…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:33:28 Authoring application: Microsoft Excel
MD5: a177437bc4d09885083e24a32db740b1 SHA-1: 656fcb4531cd5faeea3427840794e7741a661c90 SHA-256: d6d5f8738cd654030dc68d65da9f20565dffd60ed0936b2c1aa1879bf09348cc
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. Static analysis identified critical heuristics indicating the presence of an Auto_Open macro, which is a common technique for executing malicious code upon opening the document. The macro likely attempts to download and execute a secondary payload, although the specific URL or payload is not directly extractable from the provided evidence.

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
8dd8a7e90f21bcf3f043f8a8761dd4dbcf2841b50092800eb09145389add942b		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6504 bytes

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