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

Static analysis result for SHA-256 fe251f9d2071ac03…

MALICIOUS

Office (OLE) / .XLSX

129.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 140e6440e1cd4bc28da358582adf0c61 SHA-1: 45ac13a5c8d9c72fb664958c8ba38eed846c9b7d SHA-256: fe251f9d2071ac03cc1175cd59dff9fcb9ef56fc86bcc45f846be32a63a4524d
280 Risk Score

Malware Insights

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

This macro-enabled Excel document contains VBA code that leverages Wscript.Shell to execute local files and potentially download further payloads. The script explicitly attempts to run 'c:\programdata\yhjlswle.vbs' and 'c:\programdata\ughldskbhn.bat'. The presence of 'CreateObject' and 'Wscript.Shell' calls, along with the Workbook_Open auto-execution, strongly indicates a downloader or initial access mechanism. The reconstructed PowerShell command indicates a multi-stage download attempt from various URLs.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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
7a075e02dc1e88807280b9b84946715e79a3c091d50391301434649c77b78ea1		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12808 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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