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

Static analysis result for SHA-256 8c38dbbc3834ab60…

MALICIOUS

Office (OOXML) / .XLSM

18.7 KB Created: 2021-03-09 00:04:19 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0e1137f6c82bd9f4545156ce8fa1bfb5 SHA-1: e784d86a123ff452024780303be372966df32e5a SHA-256: 8c38dbbc3834ab600313e6cd32e0e1a077726f002a608b5cbf9baa87ff11f90f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

The file is an XLSM document containing VBA macros. A critical heuristic indicates the presence of a Shell() call within the VBA code, and a high-severity heuristic confirms a Workbook_Open macro. This suggests the macro is designed to automatically execute commands upon opening the document, likely to download and run a secondary payload. No specific family could be identified, but the execution method is clear.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • Suspicious extracted artifact high 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • 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 http://schemas.openxmlformats.org/spreadsheetml/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
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
80e261487dda3c8bbbae302c063573ce3a8ebe43319cf955e07df8aabdff4c61		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 39203 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
0226e807b3e09785bbdd7b49e829a3f6d1487f8a7b95ce02ba598c503478d755		 vba-project OOXML VBA project: xl/vbaProject.bin 43520 bytes

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