Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e08a28b5ff2d433b…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:38:22 Authoring application: Microsoft Excel
MD5: 8008f224c159d3aea31650edb304a95e SHA-1: ebb425fcaf268bb8317eefdbb01deea2a5d88cf8 SHA-256: e08a28b5ff2d433b1a93d4407aaca987179dc3c67db2456c1a4d179d39a7be63
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is configured to execute dangerous formula APIs. This strongly suggests the macro is designed to automatically run malicious code upon opening the document, likely to download and execute a second-stage 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
3ed8ca31b892f99ea9a06971de0a332e254ea37b90b920e6f8cf6fde2b57f948		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6668 bytes

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