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

Static analysis result for SHA-256 1a9ababb0d36f8e5…

MALICIOUS

Office (OOXML) / .DOCM

142.4 KB Created: 2020-06-08 10:16:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: f5835c266d2072e7aa97548f4bdcde28 SHA-1: 2246597b90302c8c5146830644afdf1066aafe41 SHA-256: 1a9ababb0d36f8e517a5054495b624979525b05a425438e295f09578a21bcd7a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is a DOCM containing VBA macros, specifically a Document_Open macro that is known to be used for malicious purposes. The critical heuristic firing indicates the presence of a Shell() call within the VBA code, suggesting the script attempts to execute external commands. This is further supported by the 'Suspicious extracted artifact' firing, which identified 'macros.bas' and noted VBA auto-execution with execution terms. The primary intent appears to be downloading and executing a second-stage payload, likely initiated by the Shell() function.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — 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.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
7e53617aa30d4b3f2deff9bfdc7a8120393b85e9e26cbe85a82503a010ba531c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3696 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
7506087262ff7467a6c3940be345f537900c79b59c59054d65158e464a898572		 vba-project OOXML VBA project: word/vbaProject.bin 11776 bytes

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