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

Static analysis result for SHA-256 4253a34590685711…

MALICIOUS

Office (OOXML) / .DOC

247.0 KB Created: 2021-02-07 17:10:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: b9a7a679c82d19c5ab91af310c467b70 SHA-1: 1e3646d1e8c39a29b4d53c679d5b3fd8795416c9 SHA-256: 4253a345906857118c2cbbe27d02f34f92875f687b98ae7ef14a604ba9d292c0
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The file is identified as malicious by ClamAV with the signature Doc.Downloader.BlueWord-9845926-0. Static analysis revealed the presence of VBA macros, specifically an AutoOpen macro and a CreateObject call, indicating that malicious code executes automatically when the document is opened. This suggests the document is designed to download and execute a second-stage payload, aligning with the behavior of a downloader malware.

Heuristics 7

  • ClamAV: Doc.Downloader.BlueWord-9845926-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.BlueWord-9845926-0
  • 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.
  • 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
95e176bd48e08c6b2b6eef76544ea2865b1b2d5ade90842ad30956d9cfc2fe2f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2260 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
1cfd0f3a6ff718ce1692bc04c3d07df13d8da615c8506334ae95c1f09a3384ac		 vba-project OOXML VBA project: word/vbaProject.bin 96256 bytes
Detection
ClamAV: Doc.Downloader.BlueWord-9845926-0
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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