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

Static analysis result for SHA-256 d6d22450a3cb3552…

MALICIOUS

Office (OOXML) / .DOCM

50.5 KB Created: 2021-06-28 10:39:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 7282d45e6e4b90fb4ae95ff95e36e4c0 SHA-1: 377ea39b7097c62cc5ea43bfe15ab4fd4cc5bc45 SHA-256: d6d22450a3cb3552c14ad7af8deb1df1b2d94aea2761cf5107b18a4e4c43882a
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter T1059.003 Scheduled Task Definition T1566.001 Stage File Download T1071.001 Application Layer Compromise

The file exhibits multiple indicators of malicious activity, including a VBA project with a `Shell()` call, a `Document_Open` macro, and the detection of a ClamAV malware signature. The `Shell()` call suggests the execution of external commands, likely for downloading and executing a secondary payload. The `Document_Open` macro triggers the execution of the VBA code upon document opening. The presence of obfuscated VBA code further indicates an attempt to evade detection. The overall pattern aligns with a macro-based downloader attempting to establish a command-and-control channel.

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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