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

Static analysis result for SHA-256 52ad88e5b34fa753…

MALICIOUS

Office (OOXML) / .DOCX

133.3 KB Created: 2020-01-29 13:50:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 917e22850ff406d187b5f51e7b1960df SHA-1: 513f77e8553caa038a116f21ce55c866e095d169 SHA-256: 52ad88e5b34fa753700fb346db495716699f1771fe58bd5189fefee6b168905a
220 Risk Score

Malware Insights

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

The file is a malicious OOXML document containing VBA macros, specifically a Document_Open macro that utilizes GetObject. ClamAV signatures identify it as 'Doc.Downloader.Mrwx-7567612-0', indicating its function as a downloader. The presence of the Document_Open macro strongly suggests the intent to execute malicious code upon opening the document, likely to download and run a second-stage payload.

Heuristics 6

  • ClamAV: Doc.Downloader.Mrwx-7567612-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Mrwx-7567612-0
  • 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
b32c7c6954fdf0bdb3930ce873e458dafc014ce7b5c6adb2619dcd08090e0469		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 11100 bytes
vbaProject_00.bin
ba93cae97109c2d406d919877676ccdd9606d11e4019b844586612bb231f21e5		 vba-project OOXML VBA project: word/vbaProject.bin 67584 bytes
Detection
ClamAV: Doc.Downloader.Mrwx-7567612-0
Obfuscation or payload: unlikely

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