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

Static analysis result for SHA-256 35880c5210af5dca…

MALICIOUS

Office (OLE) / .XLSX

38.5 KB Created: 2021-05-10 10:17:02 Authoring application: Microsoft Excel
MD5: db0688f5d2319ec6af692010bfb28ffd SHA-1: 39c0869d8aff33c21bd1b9730f01c7f48744c295 SHA-256: 35880c5210af5dca3edc22a693ab5f0cfcec0105cec988d930ab29fe09bd3461
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell

The sample is an Excel file containing a Workbook_Open VBA macro. This macro utilizes CreateObject to execute code, likely to download and run a second-stage payload. The specific family is not identifiable from the provided heuristics, but the execution method is clear.

Heuristics 5

  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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
79b93e3f4a10a4034a9475c1360c17053cc46253ce276170043d21bfd380ba3d		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4950 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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