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

Static analysis result for SHA-256 233f131970bb459f…

MALICIOUS

Office (OLE) / .XLSX

24.5 KB Created: 2003-12-26 20:02:48 Authoring application: Microsoft Excel
MD5: e3ff05fee248b1a700ce1389bf4d3cba SHA-1: 94f01384c35c8f74b9a02dc0f0c3d937fe871cc6 SHA-256: 233f131970bb459fa0bef3b2e6cd71813c49504789e4d738297509b9bbcb02cf
322 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1564.004 Disable or Modify Cloud Compute Infrastructure

The file is an Excel spreadsheet containing a VBA macro that is automatically executed upon opening (Auto_Open). This macro attempts to disable various Excel menu items and security features, likely to hinder analysis or user intervention. It also contains a call to the Shell() function, indicating it's designed to execute a secondary payload. The ClamAV detection as 'Xls.Trojan.Brandy-1' further supports its malicious nature. The embedded URL is likely related to the payload delivery.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Trojan.Brandy-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Trojan.Brandy-1
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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 macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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://www.avp.au/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
6b6924b42ce108279922d9d1d4c0177c0e4ac2d5a4ee79c399757725eee864ea		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4348 bytes
Detection
ClamAV: Xls.Trojan.Brandy-1
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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