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

Static analysis result for SHA-256 f75e6330b2bf9580…

MALICIOUS

Office (OOXML) / .DOC

141.7 KB Created: 2021-04-16 06:12:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 1f87335db8fa2e0bd3309569100fd648 SHA-1: d503f56b87092182c15e525fb7c1901d2712b8c7 SHA-256: f75e6330b2bf9580634c2fa258e924ca51624c902294d414c68028c3ad6afd7c
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1218 Signed Binary Proxy Execution

This OOXML document contains VBA macros, specifically an AutoOpen macro, which is designed to execute automatically upon opening. The macro utilizes GetObject and WMI (Win32_Process.Create) to launch a new process, indicating a likely attempt to download and execute a secondary payload. No external URLs were found to be malicious, and the document body did not provide further context, leading to a slightly reduced confidence in family attribution.

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.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • Suspicious extracted artifact medium 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.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/tiff/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • 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
dab552ff953576bff1cd7f0c154331997b0bb289d8353ccdd89401662a68ad45		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 6101 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
vbaProject_00.bin
a6005b5ed94c5e29dc2eb1800f171055b134a477711d91633b3fc5109d7999d7		 vba-project OOXML VBA project: word/vbaProject.bin 32256 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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