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

Static analysis result for SHA-256 518d92e9dcaac492…

MALICIOUS

Office (OOXML) / .DOC

50.3 KB Created: 2021-06-28 10:46:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 8a75eef8adfdc6a5164b2ac79180b870 SHA-1: 8b1a599db470a5a690f3b35a1f2cce140350ecae SHA-256: 518d92e9dcaac49258600bd988d6d2b0ebc2af74e4bc9796d83987e57297d18d
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter T1059.003 Scheduled Task/Job T1566.001 Valid Accounts

The document contains a VBA macro that utilizes `Shell()` to execute external commands, including `cmd.exe`. The presence of obfuscated code within the macro, combined with the detection by ClamAV as a downloader (Doc.Downloader.Ursnif06210-9875010-0), strongly indicates a malicious intent to download and execute a secondary payload. The document's `Document_Open` macro further reinforces this, triggering the malicious code upon document opening. The extracted URLs, while mostly benign, could be used to deliver further components or stage the attack.

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
93491ef146d30c3f8437bbcd19b8a4826e863292f8d4cb1beac83c7a1300f29e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1367 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
3847c13552ee5402105846048ef3de80d2389c0c12a3264fd54eda87505e4530		 vba-project OOXML VBA project: word/vbaProject.bin 17408 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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