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

Static analysis result for SHA-256 98beba560e5a553e…

MALICIOUS

Office (OOXML) / .DOC

43.2 KB Created: 2021-12-10 11:01:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 928a5dc560be72390909c901df6a06e6 SHA-1: 497e0a72cd3aceaa61de4dc96ef7de1b634a83e5 SHA-256: 98beba560e5a553eeb3e5c72e01ea5525b18390221be0b58cbdab5b33c8080d3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1218.008 Signed Binary Proxy Execution: Rundll32 T1059.001 PowerShell

The sample is a malicious OOXML document detected by ClamAV as a downloader. It contains VBA macros, specifically an AutoOpen macro, which is designed to execute code upon opening. The script uses GetObject to execute a command, reconstructing the command string from reversed parts. The reconstructed command appears to be 'rundll32.exe C:\Users\Public\Documents\load.exe', indicating an attempt to download and execute a second-stage payload. The document body contains obfuscated text that may be related to the payload or lure.

Heuristics 5

  • ClamAV: Doc.Downloader.BlueWord12210-9915312-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.BlueWord12210-9915312-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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.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/2012/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
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
f8310059994e18bc259ec99b206f4fe10dc4b1497c917c7670a1142542f082c5		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 899 bytes
vbaProject_00.bin
ed6c125438961db2f0dbce132e16607b0a47dbdcd3c4959c8f5efbf80498a103		 vba-project OOXML VBA project: word/vbaProject.bin 14336 bytes

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