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

Static analysis result for SHA-256 5762576fc6a09b4d…

MALICIOUS

Office (OLE) / .DOCX

519.5 KB Created: 2009-03-30 14:18:00 Authoring application: Microsoft Office Word
MD5: 4aa84fb242abbba1a9dd2b8976cab2ce SHA-1: 5055803a59b82b1c33c6a78150b07a080f0bcadd SHA-256: 5762576fc6a09b4ddd95908c6c34ab9b38e06a6b2878099433347cabfbeccc18
468 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1071.001 Web Protocols T1105 Ingress Tool Transfer

The document presents itself as a guide from the Colombian tax authority (DIAN) to enable macros, a common social engineering tactic. Crucially, the embedded VBA macros contain calls to URLDownloadToFile and Shell(), indicating they are designed to download and execute a second-stage payload from the URL http://germanya.com.ec/logs/test.exe. The presence of AutoOpen and Workbook_Open macros further supports the malicious intent.

Heuristics 12

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • ClamAV: Doc.Downloader.Generic-6698421-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6698421-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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://germanya.com.ec/logs/test.exe�
    • http://germanya.com.ec/logs/counter.php
    • http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
5c91c2a4ba440c60dce89c0bee6d8c1eeb1cb4292d221258cbad331d6cc5028a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1327 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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