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

Static analysis result for SHA-256 d750b45195d04fc7…

MALICIOUS

Office (OLE) / .XLS

302.5 KB Created: 2020-07-02 15:46:44 Authoring application: Microsoft Excel
MD5: 3a8d3296c6e69d14a8ba57146e7375a4 SHA-1: 07388a3a4f7aa194d3f34ad7eee4e3db25e5e7ba SHA-256: d750b45195d04fc7e3db0bc3c526921f953d8cffb65d8cd35bb8886ea2c1cd99
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file is an Excel 4.0 macro-enabled spreadsheet that contains an Auto_Open function, a critical heuristic firing. This function is designed to execute automatically when the workbook is opened, and it is configured to download a payload from a URL. The presence of the 'SE_ENABLE_LURE' heuristic indicates that the document likely contains instructions to enable macros, a common social engineering tactic. ClamAV detection further confirms its malicious nature.

Heuristics 5

  • 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.
  • ClamAV: Xls.Dropper.Agent-8900391-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8900391-0
  • 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
b2d0bcd46b7d70beea5d9fe9788ae40e7667c3327caceb40f8efd159dbecc030		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 302972 bytes

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