Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 31e06f1131ab43ec…

MALICIOUS

Office (OOXML)

18.0 KB Created: 2021-07-25 23:24:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 3be928f056f4b0702f06bd1b4ec82cc6 SHA-1: a15cbca2134eb4483ab12ba5794443128166a974 SHA-256: 31e06f1131ab43ec7d0aa832f518f2c21d98233678e8081a7e62d83216c6f7ff
182 Risk Score

Malware Insights

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

The file is an OOXML document containing a VBA project with an AutoOpen macro, indicating malicious intent. The extracted VBA script uses the CreateProcessA API to execute commands passed as a string argument, suggesting it's designed to download and run a second-stage payload. The presence of the AutoOpen macro and the VBA execution capabilities strongly point to a macro-based malware delivery.

Heuristics 5

  • ClamAV: Doc.Malware.Valyria-10012625-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10012625-0
  • 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/2020/wordml/sdtdatahash
    • 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
b8eb867e27f3364f547c4a6b11f0449d85433ffe0b1af38cfae1c9dce52b3f4f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2028 bytes
vbaProject_00.bin
6f2d61fd28cad9187b25a45074fae3a8db846d6e97ee97d8446855222a896f9f		 vba-project OOXML VBA project: word/vbaProject.bin 14336 bytes
Detection
ClamAV: Doc.Malware.Valyria-10012625-0
Obfuscation or payload: unlikely

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