Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e05d61cc5699e1cb…

MALICIOUS

Office (OOXML)

16.0 KB Created: 2021-07-16 10:28:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 27c70eff356fe607baadb1cf44555808 SHA-1: a7be0a7c6b0b422394410c4d1d3b51421fb0393d SHA-256: e05d61cc5699e1cb6e02b997039eea0a9287ef842da4bb0a71a37f8b95d39d3a
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample contains a VBA macro that is automatically executed upon opening the document. This macro, named 'Document_Open', calls another subroutine 'ProcessImage' which constructs and executes a PowerShell command. The PowerShell command is heavily obfuscated but appears to be designed to download and execute a second-stage payload from a remote source.

Heuristics 6

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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.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
5bfac808ba103f1aa0d52af4a3b544ad6e12800cad790b0402a6479344dc4180		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1335 bytes
vbaProject_00.bin
cd3866632722b74331090e9f57e3984e5d9c53b006074737a5070151af7bba24		 vba-project OOXML VBA project: word/vbaProject.bin 9728 bytes

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