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

Static analysis result for SHA-256 b8e5e1c4efe88f24…

MALICIOUS

Office (OOXML) / .DOCX

123.8 KB Created: 2020-01-24 17:55:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 86e99e0626fd00ec6d7e1d3cc1b5776a SHA-1: 519f161dec84d06f2041754dcb1a04ef2cd01f8f SHA-256: b8e5e1c4efe88f24bdda679cfb0abe540819e25486a1d46982910adfee2caa96
220 Risk Score

Malware Insights

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

The presence of a Document_Open macro and a GetObject call strongly indicates that the VBA code within this OOXML document is intended to execute automatically when the document is opened. ClamAV detections further confirm the malicious nature of the file. No specific malware family could be identified, but the execution of embedded VBA macros is a common delivery method.

Heuristics 6

  • ClamAV: Doc.Malware.Generic-7561114-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-7561114-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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.microsoft.com/office/drawing/2014/chartex
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartex
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/drawing/2016/ink
    • http://schemas.microsoft.com/office/drawing/2017/model3d
    • 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/2012/wordml
    • http://schemas.microsoft.com/office/word/2018/wordml/cex
    • http://schemas.microsoft.com/office/word/2016/wordml/cid
    • http://schemas.microsoft.com/office/word/2018/wordml
    • http://schemas.microsoft.com/office/word/2015/wordml/symex
    • 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
2e69eaa04feffbb73e98259741bf4755e343bdf74147fd3a247cee8f53495784		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 13241 bytes
vbaProject_00.bin
106eae77aeacfe4074a08429ba8085d0c13fd08596c1596e54ec6b8689605d33		 vba-project OOXML VBA project: word/vbaProject.bin 114176 bytes
Detection
ClamAV: Doc.Malware.Generic-7561114-0
Obfuscation or payload: unlikely

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