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

Static analysis result for SHA-256 b0cccc9e79029c5b…

MALICIOUS

Office (OLE) / .XLSX

280.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: e1df57deebdfeab450bf91049acff902 SHA-1: 0037a523a17be3411b88072f7ceb3cc0ef384da7 SHA-256: b0cccc9e79029c5b0b4e835e22e783a37ded6a300ca9d1738e554b126dd0969c
120 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a strong indicator of malicious intent. The document body and heuristics indicate a lure to enable macros by impersonating a document signing service. The embedded URL likely serves as a download location for a second-stage payload. No specific family could be identified.

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.
  • 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
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://obsusa.net/chemgrcr.dll�
    • https://obsusa.net/chemgrcr.dll

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
3f60040f0859ee386a53c71ba23994fa6bc11edc208e5785a15084a0a8ab7915		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3395 bytes

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