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

Static analysis result for SHA-256 ce4daac8f83a34a4…

MALICIOUS

Office (OLE) / .XLSX

107.5 KB Created: 2006-09-28 05:33:49 Authoring application: Microsoft Excel
MD5: 819b1896050b11f6ffdd835f6249874e SHA-1: 13ec3888d97a0f7d44ed6ac264768c2f6d8b27af SHA-256: ce4daac8f83a34a43b75073dcb9a17806cc47a91c2f0fba1017ee636feff53a7
280 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1059.003 Windows Command Shell

The file contains VBA macros, with a Workbook_Open auto-execution routine. A critical heuristic firing indicates the use of Shell() calls within the VBA, and another high-severity heuristic points to CreateObject and GetObject calls. These indicate the macro is designed to execute external commands or objects. While the script is truncated and obfuscated, the presence of these indicators strongly suggests it's a downloader or dropper for a second-stage payload. No specific family could be identified.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
8ec801cf47769144acbc27068304db645048f62ffcd3df42997770f282a1666f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4965 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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