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

Static analysis result for SHA-256 278e368f49b3dc5e…

MALICIOUS

Office (OOXML) / .DOC

180.1 KB Created: 2020-05-11 15:09:00 UTC Authoring application: Microsoft Office Word 14.0000
MD5: 42010d7791d78908150cbd73bc6e139e SHA-1: 120266873d1df2012e0d1b67e915b126fef7bc63 SHA-256: 278e368f49b3dc5e72eb5c81abc8b379167ab4a1ef282c61485dccd5cbd12b8d
240 Risk Score

Malware Insights

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

The sample is an OOXML document containing VBA macros, specifically a Document_Open macro, which is a common technique for initial execution. Heuristics indicate the presence of VBA Chr string obfuscation and auto-execution, suggesting the script is designed to download and execute a second-stage payload. The ClamAV detection name 'Doc.Dropper.HexEncodedEXEHeader-9789587-1' further supports this dropper functionality.

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
d0240f862c84f767cd37a638cc97163e405471f01e2e5719148a9c351a486de7		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2017 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
9547d3b432e1efb666d33a5460fde18fda8369bced54b6f7e18636111d00f1c0		 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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