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

Static analysis result for SHA-256 ef30c682e78f98be…

MALICIOUS

Office (OOXML) / .DOC

139.9 KB Created: 2021-02-07 17:10:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 240f9e976a932830b791e2f88248f711 SHA-1: cc7ac30d69ec8731f8ce4793e94ac52117e50b0e SHA-256: ef30c682e78f98be98a414a7d7ce651f64f5b0a10b7fae017dcd59383eb6ca84
200 Risk Score

Malware Insights

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

The file is a malicious OOXML document containing VBA macros, specifically an AutoOpen macro that utilizes CreateObject. This indicates the macro is designed to execute automatically upon opening the document. The ClamAV detection 'Doc.Downloader.BlueWord12210-9918949-0' strongly suggests the macro's purpose is to download and execute a secondary payload. No specific URLs or hashes were extracted, but the presence of the AutoOpen macro and the downloader heuristic are high-confidence indicators of malicious intent.

Heuristics 6

  • ClamAV: Doc.Downloader.BlueWord12210-9918949-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.BlueWord12210-9918949-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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
08489eed165f9d0a3d9f503ff3ddf1fb9e331aa8898a4eca3b47d5ec7e0413fb		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2314 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
c8e148d296aacaecad1978c707ec477af36d2fe3802b1cce531c998dc5c2d234		 vba-project OOXML VBA project: word/vbaProject.bin 99840 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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