Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 734ab5d08384bdbd…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-07-13
MD5: 7147f8e10c19ad02205650af40cfc0e0 SHA-1: a7ce49fd7453a3418afacb3b8d5686c526e0b6bd SHA-256: 734ab5d08384bdbddf915b2a530e55637c8cf568c1521599fb5f1b68963cb08c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open macro that is designed to execute automatically. The macro uses a dangerous function (RUN) and includes a lure to enable macros, indicating malicious intent. The macro likely downloads a second-stage payload from the URL http://bqx12lnjk03rrdio.xyz/i., which is a common technique for malware distribution.

Heuristics 4

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
3a08691eed72e5ed205a0b2d682f61d57bf1de10bae67e5c55da30ecdcba1b08		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4335 bytes

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