Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 7629d03f27ed37b7…

MALICIOUS

Office (OOXML)

37.4 KB Created: 2021-07-17 16:15:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 2564f491755445debac522d684e56336 SHA-1: 276b4196cd0512ee36965b0f59bd972a2f4de314 SHA-256: 7629d03f27ed37b7235d3b68edb7bae86d656bc9f218d210333a9899b5c2fa99
224 Risk Score

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Suspicious extracted artifact info 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.
  • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
df6b2bf608c56de271f1f3181784db5f93cdb8d8faf592c8c8193ac7f67dffda		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 49249 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 170 long base64-like blob(s).
vbaProject_00.bin
61287252de7851a6080a5a2b1227079d9656a5647fcd4638172882667acde5dc		 vba-project OOXML VBA project: word/vbaProject.bin 75264 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 170 long base64-like blob(s).

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