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

Static analysis result for SHA-256 531471184d5c8eb4…

MALICIOUS

Office (OOXML) / .DOC

43.1 KB Created: 2021-05-10 07:13:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 2a8f04ddc03f8c4db0821275619b55b4 SHA-1: 8bf21477518f4f33bbd9f1a0f013302be516ea53 SHA-256: 531471184d5c8eb4ec97c12059b5bbc8f397b3749033f7fd80405a1b560fbb17
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell

The OOXML document contains VBA macros, including a Document_Open macro that utilizes the Shell() function. This indicates the document is designed to automatically execute code upon opening. The presence of a long encoded blob within the extracted artifacts further suggests obfuscated malicious code. The primary intent appears to be downloading and executing a second-stage payload.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c28cb9249c9dd67a1ab2f905679d3cdff90730b6a539aff3c14203ef1b69e8fd		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1571 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
4536b6342eae7d6a8c38e9ad91515d38cea1a2fd269d620db218cec79a0850bf		 vba-project OOXML VBA project: word/vbaProject.bin 9728 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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