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

Static analysis result for SHA-256 58a212f4c5318599…

MALICIOUS

Office (OOXML) / .DOCM

25.4 KB Created: 2022-06-16 15:49:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2022-08-02
MD5: bad041f27a57d38109345bc33acad3c9 SHA-1: ec1b5c18bf80a3b9f61cf6440c5bd725fb95de89 SHA-256: 58a212f4c53185993a8667afa0091b1acf6ed5ca4ff8efa8ce7dae784c276927
270 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The file is a DOCM document containing VBA macros, indicated by multiple OLE_VBA heuristics. The 'macros.bas' script uses Windows API calls like CreateRemoteThread, VirtualAllocEx, and WriteProcessMemory, suggesting it's designed to inject and execute code. The ClamAV detection 'Doc.Malware.Valyria-10012625-0' further confirms its malicious nature, likely involving the download and execution of a secondary payload.

Heuristics 8

  • 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
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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
ec84d8abbbc7ed90e7b45a3ba7e72d44949e119e39aba1ad9f4bae08256ca9fc		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 8044 bytes
vbaProject_00.bin
95c75b22fe61919f019513789a5d6e0483826f97128bb879407d384ed2a15538		 vba-project OOXML VBA project: word/vbaProject.bin 22528 bytes
Detection
ClamAV: Doc.Malware.Valyria-10012625-0
Obfuscation or payload: unlikely

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