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

Static analysis result for SHA-256 d500ee06ed8664bc…

MALICIOUS

Office (OOXML) / .DOC

50.5 KB Created: 2021-06-28 10:47:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 24d2245c3657caba1e3a3bbe14e0cc25 SHA-1: 705c4ae8bba1af113d0e3130bad11be583d65c82 SHA-256: d500ee06ed8664bcd5acfac596094aed9fe9c97c4b2b21b3b052c1eb7980a8b7
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter T1059.003 Scheduled Task/Job T1566.001 Valid Accounts T1071.001 Application Layer Protocol – Web Protocols T1071.002 Web Service Infection T1071.003 Web Traffic T1105 System Information Discovery

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 file's malicious nature. The VBA code's `Document_Open` subroutine, combined with the `Shell()` calls, strongly suggests a macro-based downloader attempting to establish a connection and execute a payload. The obfuscated `indexDocTmp` function and `singleLocal` function are typical techniques used to hide the true intent of the script.

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
b582aebcac7fa20f0337e6235bdd1221a464de86361f1a1c817464406a823ade		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1343 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
1356c88372f6ac165eae5f3f4ba4000194c19c9deb68eadd1572d2254131fe78		 vba-project OOXML VBA project: word/vbaProject.bin 17920 bytes

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