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

Static analysis result for SHA-256 4e6ea45f01bd761b…

MALICIOUS

Office (OOXML) / .DOC

50.5 KB Created: 2021-06-28 10:39:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: a22847f40dee79a40256c7c1e6912da7 SHA-1: 2dd809563d06f582b0371cb9dab06c308f2d6922 SHA-256: 4e6ea45f01bd761bdfacc3e0397238607373b5a35f9eb8704b913252d3a19aa0
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter T1059.003 Scheduled Task Definition T1566.001 Phishing T1071.001 Just-in-Time Deployment T1071.002 Impair Defenses T1071.003 Service Negotiation

The file exhibits several indicators of malicious behavior, including a VBA project, an `Document_Open` macro that executes `Shell()`, and references to `cmd.exe`. The ClamAV detection confirms the presence of malware. The `Shell()` call strongly suggests the intent to execute a command-line utility, likely for downloading and executing a secondary payload. The embedded URLs and the obfuscated VBA code further support this assessment. The document's purpose is to deliver a malicious payload.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Downloader.Ursnif06210-9875010-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Ursnif06210-9875010-0
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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://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.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
46f3621c587494ead00b5f6a228d3894f4c61d156f5bae18cc183892b511bb8e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1381 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
8203cb666e338c11c22a0ecd1789779c3c159a15fb05df6c0ff225857280ca40		 vba-project OOXML VBA project: word/vbaProject.bin 17408 bytes

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