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

Static analysis result for SHA-256 1cfcfa64c0e1dcce…

MALICIOUS

Office (OOXML) / .DOC

50.5 KB Created: 2021-06-28 10:46:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 3097d454e52d5b6dbf6329cf69bc1e2e SHA-1: 3c3b12e1f37af129ad3a1557e6e7036b4f8a2ee6 SHA-256: 1cfcfa64c0e1dcce3aa0dc280fa21d6015acf3c615ce55ce23fb81813d37d799
262 Risk Score

Malware Insights

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

The file exhibits multiple indicators of malicious activity, including a VBA macro with `Shell()` and `cmd.exe` references. The ClamAV detection confirms the presence of a known malicious document (Doc.Downloader.Ursnif06210-9875010-0). The script attempts to execute commands, likely downloading and executing a second-stage payload. The obfuscated script further suggests an attempt to evade detection. The document's `Document_Open` macro is a common technique for triggering malicious actions upon document opening.

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
51aa4651fdd6979ef04aabe10e016ae9877f7b9d5fcc88d148daf1611346de9c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1403 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
9db97e7c5590068048307f00f6a5fb362abd08eccd7c8c6ad1d3f05ffe776e49		 vba-project OOXML VBA project: word/vbaProject.bin 17408 bytes

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