Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 3f5044ef2ab5a2b4…

MALICIOUS

Office (OOXML)

20.9 KB Created: 2021-07-11 09:14:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: c96d5a4b1c70d81b072324c803c93d79 SHA-1: 7d41520c24b9a2ca7d642383be3e584b3c4a750e SHA-256: 3f5044ef2ab5a2b498641f5f2dc534602b2e519b1cbfcd0deef96ae43571adfb
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is a malicious Office document containing a VBA macro with an AutoOpen function, which is a common technique for initial execution. The macro utilizes Windows API calls such as CreateProcess, suggesting it attempts to download and execute a second-stage payload. ClamAV detection further confirms its malicious nature.

Heuristics 5

  • ClamAV: Doc.Malware.Valyria-10015188-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10015188-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — 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.microsoft.com/office/drawing/2015/10/21/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/drawing/2016/ink
    • http://schemas.microsoft.com/office/drawing/2017/model3d
    • 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/2018/wordml/cex
    • http://schemas.microsoft.com/office/word/2016/wordml/cid
    • http://schemas.microsoft.com/office/word/2018/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
2b06f40cf622971c7309fc857088906dec32254a5123eebcb22ffd0938f911d8		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 4529 bytes
vbaProject_00.bin
9fe5683608a3efca956bd864691b3105e8d2b49ee011f221216ff1a4d34ef99a		 vba-project OOXML VBA project: word/vbaProject.bin 22528 bytes
Detection
ClamAV: Doc.Malware.Valyria-10015188-0
Obfuscation or payload: unlikely

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