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

Static analysis result for SHA-256 3442811d52ebea05…

MALICIOUS

Office (OOXML) / .DOCX

18.1 KB Created: 2020-04-30 02:34:00 UTC Authoring application: Microsoft Office Word 12.0000
MD5: afda55010adb964e192de9e102a4ddcd SHA-1: a441ddbf9c23cde2e14383bc2f19bddf59ec96f5 SHA-256: 3442811d52ebea057ad13dfa991760f6eb9a848f190efb2f06ba0f21eb966a9e
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is a malicious OOXML document containing a VBA macro. The macro is triggered by the Document_Open event and uses GetObject to create a WMI process, indicating an attempt to execute a second-stage payload. The script attempts to download a payload from the URL 'http://bit.ly/3bUcGCk'.

Heuristics 6

  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2006/wordml

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
5d5976dfce698d56c373870ab98511412b71c8278f3330251800bee039f60c1f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3002 bytes
vbaProject_00.bin
dbe147642d8b0c283dbe6ced11a6cc5f2f4635ca80951aa386edb38d4b591e1a		 vba-project OOXML VBA project: word/vbaProject.bin 15360 bytes

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