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

Static analysis result for SHA-256 2f6e6881e714782e…

MALICIOUS

Office (OOXML) / .DOC

50.5 KB Created: 2021-06-28 10:51:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 1ed37d4d1e490c634cddcd1c905fd533 SHA-1: e3f812ddd241dbb52a15671f4328ae6f1e3179fa SHA-256: 2f6e6881e714782e8cd3c3f0c92bc576d9cc008e526be5e21d13a881e5b90e0f
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter T1059.003 Scheduled Task/Job T1053.005 System Execution - User Initiated T1566.001 Phishing T1071.001 Application Layer Protocol – Web Protocols

The file exhibits several indicators of malicious behavior, including the presence of VBA macros, `Shell()` calls that execute external commands (specifically `cmd.exe`), and the extraction of URLs. The ClamAV detection further confirms the malicious nature of the document. The VBA code appears to be designed to download and execute a payload, likely a downloader or command-and-control component. The use of obfuscated functions and XOR encoding suggests an attempt to evade detection.

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
4da9db80d460af51350ee568c8faf7d52c87c2ed57cbd966cc10981e8ad0246c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1387 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
9f5301ecfa389694995ac2b9c998fc82b4e09a77ec1621bb70ce5982c62d69bb		 vba-project OOXML VBA project: word/vbaProject.bin 17920 bytes

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