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

Static analysis result for SHA-256 d57eb19a1b2afa33…

MALICIOUS

Office (OLE) / .XLSX

9.10 MB Created: 2011-06-02 02:19:00 Authoring application: Microsoft Excel
MD5: 3c6d5cc1c649364198b80da8d3dc7381 SHA-1: ea4cba759a38144bd1739ef461558087a2d4b4d6 SHA-256: d57eb19a1b2afa338d40cec6ec9c516e78898f598acff985ebba11ab50796867
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter T1071.001 Application Layer Compromise T1566.001 Phishing T1071.002 Application Return-and-Execute T1071.003 Application Layer Compromise - Malicious Application

The file exhibits several indicators of malicious activity, including a large, high-entropy region appended to the OLE body containing shellcode, a VBA macro with an Auto_Open and Auto_Close sub that attempts to create a backup copy of the file and potentially establish persistence, and a ClamAV detection. The macro's behavior – enabling cancel key, attempting to save a copy, and running the allocated sub – strongly suggests an attempt to modify the workbook and potentially execute further malicious code. The high entropy region further supports the presence of a payload. The file is likely a macro-based downloader or dropper.

Heuristics 6

  • ClamAV: Xls.Malware.ExcelSic-10004731-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.ExcelSic-10004731-1
  • OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOAD
    OLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • 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://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
d49b3eed57ea333340314eacd5bf3454f6a2ba3085f3bfa723034dd1a2d97cfb		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1510 bytes

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