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

Static analysis result for SHA-256 6d626748d644400b…

MALICIOUS

Office (OOXML) / .DOC

75.8 KB Created: 2021-03-11 19:45:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: eb5eee3c6d77942a0106ee55ff7c54eb SHA-1: 75055bd884890bf61a37467d054449a2d5cb92b5 SHA-256: 6d626748d644400b78ae6d92865a51dd7d6746c4febb8aa2eff6605bbb2a6b78
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains VBA macros with an AutoOpen subroutine that uses CreateObject to execute a command. The script attempts to create and execute a file named 'main.hta' from the public user directory. The obfuscated string within the VBA script likely decodes to a malicious payload, which is then executed by the shell command.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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 medium 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.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
8417f7a0649f8d67aac90a89d64d32582d56aeb334384bfcb13b4bdb5fd1807e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5335 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s).
vbaProject_00.bin
261402c40b06184400dc3f59434f0e01c3550efbb94f222c4cbc9b6c52de602e		 vba-project OOXML VBA project: word/vbaProject.bin 27648 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s).

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