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

Static analysis result for SHA-256 2f060cd4759b55dd…

MALICIOUS

Office (OLE) / .XLS

152.0 KB Created: 2021-01-15 22:22:16 Authoring application: Microsoft Excel
MD5: ccd75a60efa2cf70fd228a3c6f4ad493 SHA-1: 8d3ec5f43b068fe376903f8536dcb5c7b0e07e36 SHA-256: 2f060cd4759b55dde8055ae053ecd959b9ac128e73d0042111362d9d5bf6b508
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 PowerShell T1204.002 Malicious File

The critical heuristics OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN indicate the presence of Excel 4.0 macros designed to execute automatically. The macro script reconstructs a PowerShell command that downloads a file from 'https://tinyurl.com/10s9ax2x' and saves it as 'sp.exe'. It then attempts to execute this downloaded file, likely 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
3f7962d45f9c9e6d2d0fee2fcf30f56dd668b99866df41bc39896df16c492dfd		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1376 bytes

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