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

Static analysis result for SHA-256 9b7de51558eeffaf…

MALICIOUS

Office (OOXML) / .DOC

16.5 KB Created: 2022-09-26 16:45:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2022-09-29
MD5: 36b85687634e5b6e4e22ca582d0cc99d SHA-1: 1b51b1206f2c4b1030a7fca525454fb4d5bc803e SHA-256: 9b7de51558eeffaf3077641a0184391a34c76c2f752109fcab5c97836a8728f1
302 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1547.001 Registry Run Keys / Startup Folder T1204.002 Malicious File

The VBA macro within the document executes a `Document_Open` subroutine. This subroutine constructs a PowerShell command to download a JavaScript file from 'http://209.127.20.13/wok.js' and save it as 'C:\Users\Public\webnote.js'. It then attempts to create a shortcut file 'C:\Users\Public\skeml.lnk' which, when executed via 'rundll32.exe', appears to be intended to launch the downloaded script. The presence of `cmd.exe` and `GetObject` calls, along with the ClamAV detection, strongly indicates malicious intent.

Heuristics 8

  • ClamAV: Doc.Malware.Valyria-10008068-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10008068-0
  • 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.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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
  • 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.microsoft.com/office/2019/extlst
    • 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
edec2d83c0268f1256fe44865666f7dacc586d947c2604adca1170629fd414f9		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1240 bytes
vbaProject_00.bin
5db6d695cf9874444bcdc3f70ee10fdcebc7184d4e3cf3c665ef9c90f3d44272		 vba-project OOXML VBA project: word/vbaProject.bin 9216 bytes
Detection
ClamAV: Doc.Malware.Valyria-10008068-0
Obfuscation or payload: unlikely

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