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

Static analysis result for SHA-256 e26c4466ac96339c…

MALICIOUS

Office (OOXML) / .DOCX

174.5 KB Created: 2020-01-28 22:31:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 60a7e21d91915fd13497876b2c08deac SHA-1: fd6120d300ec16438e0285e94afa919239813751 SHA-256: e26c4466ac96339cf441036fb05d86cba2f624e2c7481c1ca86209c19122cbc6
220 Risk Score

Malware Insights

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

The file is an OOXML document containing VBA macros, specifically a Document_Open macro, which is a common technique for initial execution. ClamAV detected this file as 'Doc.Downloader.Eksn-7566623-0', indicating it functions as a downloader. The presence of a Document_Open macro and the ClamAV detection strongly suggest the intent is to download and execute a second-stage payload.

Heuristics 6

  • ClamAV: Doc.Downloader.Eksn-7566623-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Eksn-7566623-0
  • 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
e7ba6a91297b15186a4727d1480d2626d8f8f8e48da2aedcbd59648df2bba024		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 40663 bytes
vbaProject_00.bin
314739c5cb5dd07725b7fc929dcd3d656c1c425f180728d412236526bf358ae8		 vba-project OOXML VBA project: word/vbaProject.bin 323584 bytes
Detection
ClamAV: Doc.Downloader.Eksn-7566623-0
Obfuscation or payload: unlikely

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