Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 05162287dad1a6e6…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:42:54 Authoring application: Microsoft Excel
MD5: 04f44cbd720f38d49ce97d364247da79 SHA-1: b579d50d0c99056c5da2a87a86e8a50a5151ad16 SHA-256: 05162287dad1a6e6390b4559a9472b05a91b54bb262d0d5ab043d4444673a4a5
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 a common technique for executing malicious code upon opening the workbook. The macro sheet contains a reference to 'Auto_Open', suggesting an attempt to automatically run code. The document body contains a large amount of seemingly random characters, which may be obfuscated code or data.

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
5f4fac25d361f735f5c698aff85619017505be6a05bca56cc065b24ffb253a33		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6506 bytes

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