Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 0883deaa1946b08c…

MALICIOUS

Office (OOXML) / .XLSM

86.1 KB Created: 2020-05-18 18:30:22 UTC Authoring application: Microsoft Excel 14.0300
MD5: a36079b62c9c991fecc8bbede3e87c6b SHA-1: 003596748d6d074f55a26821b661f4d4b8671f5e SHA-256: 0883deaa1946b08c5f7953c035d29d4162c5fb7a1ab2b0ec529898d5c9688439
210 Risk Score

Malware Insights

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

The file is an XLSM document containing Excel 4.0 macros, specifically utilizing the RUN function to execute code. The macros are designed to call external URLs, such as https://ludicrouslyl.at/3/dip.dll and https://ludicrouslyl.at/3/dip, which likely host a second-stage payload. The use of dangerous XLM formula APIs like RUN indicates a clear intent to download and execute malicious content.

Heuristics 6

  • Excel 4.0 macro sheet (1 sheet(s)) critical OOXML_XLM_MACROSHEET
    Spreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks.
  • Excel 4.0 Auto_Open defined name critical OOXML_XLM_AUTOOPEN_DEFINEDNAME
    Workbook defines _xlnm.Auto_Open or _xlnm.Auto_Close while containing an XLM macro sheet. This is the OOXML/XLSB auto-execution shape for Excel 4.0 macros.
  • Dangerous XLM formula APIs: RUN, CALL, HALT critical OOXML_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet uses formula APIs that call directly into Win32 (=CALL/=EXEC/=REGISTER/=FORMULA). These are the primitives used to download payloads, write files, and start processes from an XLM macro without invoking VBA.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 20 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • 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://ludicrouslyl.at/3/dip.dll
    • https://ludicrouslyl.at/3/dip
    • http://schemas.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.microsoft.com/office/excel/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml
86f812adfcbd5f06c3773aff438194389c09e555b83a29ada954c75adf656b18		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 45249 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 shell/COM execution token(s).

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