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

Static analysis result for SHA-256 ac72be7e600689c8…

MALICIOUS

Office (OOXML) / .DOC

75.8 KB Created: 2021-03-16 04:39:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 1c8ddd7d828d4018f3a946b54c97b3c8 SHA-1: f71230fc32fd09d7d0f047bb3694dee0a1778796 SHA-256: ac72be7e600689c834450d211dda7a9100e07c8979f972749007e4ab51f7b202
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The OOXML document contains VBA macros, indicated by the 'OOXML_VBA' heuristic. The presence of an 'AutoOpen' macro and the use of 'Shell()' and 'WScript.Shell' (OLE_VBA_AUTOOPEN, OLE_VBA_SHELL, OLE_VBA_WSCRIPT) strongly suggest that the macro is designed to execute arbitrary commands. The 'CreateObject' call further supports this, likely for downloading and executing a secondary payload. No specific family could be identified, and no external IOCs were extracted.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.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
2a25fd468722c4f0c3eb7fe05bb287e99e1b0654a419005c8c82e742fac35107		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5157 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
0ef79d31d1b9a7c1b861b576210ca3fee598fb9ebb995b30405b1c7213c21964		 vba-project OOXML VBA project: word/vbaProject.bin 28160 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 7 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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