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

Static analysis result for SHA-256 0c39418db7ea0338…

MALICIOUS

Office (OLE) / .XLSX

151.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: b68cbcb2b16a1d480bbc4f15e6c9fda9 SHA-1: c0ce2d69ee0a12c12132fc8f0311b5fb296e6aa9 SHA-256: 0c39418db7ea03386c7983c0ca1565beb41c20911062c8ad54ebb8327309d2b7
302 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains VBA macros, specifically a Workbook_Open event, that are designed to execute code. Heuristics indicate the macros reconstruct and download payloads from multiple URLs. The reconstructed command line in the DOC BODY suggests the execution of a batch file and a VBScript, likely to download and run a second-stage payload. The ClamAV detection name 'Doc.Downloader.EmotetExcel02222-9938901-0' further supports this downloader behavior.

Heuristics 8

  • URL reconstructed from VBA cell-staged base64 dropper (5 URLs) critical OLE_VBA_CELL_DROPPER_URL
    VBA reads worksheet cells, strips junk substrings via Replace(), and base64/UTF-16 decodes the result into a PowerShell EncodedCommand payload. The download URL is never contiguous in the file bytes; it was recovered by removing the macro's Replace() junk tokens from the cell strings and decoding the staged base64.
  • ClamAV: Doc.Downloader.EmotetExcel02222-9938901-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02222-9938901-0
  • 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.
  • 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 https://store.uxdsummit.com/wp-admin/VfgBSQa7Z/
    • https://glowrentals.com/wp-admin/f1zeAKGTnS6I/
    • http://candisee.bminteractivegroup.com/1g94ngo/2n7lJoPuPDEanPcX/
    • http://bachilleratoporciclos.org/wp-content/zR/
    • http://formula8020.com/css/JCuR6OE404DgR/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12041 bytes

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