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

Static analysis result for SHA-256 4426f68adbceaa14…

MALICIOUS

Office (OOXML) / .XLSM

18.8 KB Created: 2021-03-10 10:08:45 UTC Authoring application: Microsoft Excel 16.0300
MD5: 8fa508038223405c14000d0a2d909aa6 SHA-1: 4bbcb5766ec862e7a674ca9a420443bc18aa4855 SHA-256: 4426f68adbceaa14bd026618a134a3c84f83b546777f2f63bec6506d9fce9157
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is an XLSM document containing VBA macros, specifically a Workbook_Open macro that utilizes the Shell() function. This indicates the macro is designed to execute arbitrary commands upon opening the document, likely to download and run a second-stage payload. The presence of a Workbook_Open macro and Shell() call strongly suggests a malicious intent to compromise the user's system.

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
50b8b5367c6486fa186d12486680fb32bdf52b55433135576bf6935c91678c92		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 39531 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
88a87a735080c148c3e9828fc708fb1992b62e038f96d2bdd79eff8d29f0e469		 vba-project OOXML VBA project: xl/vbaProject.bin 43520 bytes

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