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

Static analysis result for SHA-256 ae473d07d944f559…

MALICIOUS

Office (OOXML) / .DOCM

116.3 KB Created: 2023-01-05 08:54:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2024-05-28
MD5: 1c51dcfec855841fbd2d1952083d8aaa SHA-1: 37740bcc95f5b54ab4d1fe305314171219b7e00f SHA-256: ae473d07d944f559e365f0dfe60c54b82d12c6eb9ab50251561e2355b5e6a950
282 Risk Score

Malware Insights

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

The sample is a DOCM file containing a VBA macro that automatically executes upon opening, as indicated by the 'Document_Open' macro and 'OLE_VBA_PCODE_AUTOEXEC_EXEC' heuristic. The macro utilizes the 'Shell()' function, a critical finding, suggesting it's designed to download and execute a secondary payload. ClamAV detection further confirms its malicious nature.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Malware.Valyria-6714124-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-6714124-0
  • 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
  • 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.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/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
24e45389b5db782cc7c1ebfbffb085d4bf11d6b735556e7ea177ce9f3f8afb9a		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 104504 bytes
vbaProject_00.bin
bd16765486d2b47b75c5f41886553e0e59a6b0e8b3386d009d94bcc587b90481		 vba-project OOXML VBA project: word/vbaProject.bin 260096 bytes
Detection
ClamAV: Doc.Malware.Valyria-6714124-0
Obfuscation or payload: unlikely

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