Malicious Office (OOXML) / .DOC — malware analysis report

Static analysis result for SHA-256 a3dc0ff82b9563df…

MALICIOUS

Office (OOXML) / .DOC

266.5 KB Created: 2020-05-11 15:09:00 UTC Authoring application: Microsoft Office Word 14.0000
MD5: e5017c9af3765517b9b095acbcfa0c08 SHA-1: 836d427ef948c2bed30f431fed36960eb86beee7 SHA-256: a3dc0ff82b9563dfa84c3e28973ca5b8897db64fdc021afed6035ee786712434
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is a malicious OOXML document containing VBA macros, specifically a Document_Open macro that uses CreateObject and GetObject calls. ClamAV identifies it as 'Doc.Dropper.HexEncodedEXEHeader-9789587-1', indicating its function as a dropper. The presence of VBA macros and the ClamAV detection strongly suggest this document is designed to download and execute a secondary payload.

Heuristics 7

  • ClamAV: Doc.Dropper.HexEncodedEXEHeader-9789587-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.HexEncodedEXEHeader-9789587-1
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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 project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • 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.microsoft.com/office/word/2010/wordprocessingCanvas
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2010/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInk
    • http://schemas.microsoft.com/office/word/2006/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShape

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
046e7129ce81d2516984d30d07c444a4b086b0bbfb14a2e8402654f4bf843ac3		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1708 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 23 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
998869b18dc80451143e592d3fab79218e680883fd1fdc44e6b9301dd9e267b7		 vba-project OOXML VBA project: word/vbaProject.bin 10752 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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