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

Static analysis result for SHA-256 a9e3bc2eb732632e…

MALICIOUS

Office (OOXML) / .DOC

139.6 KB Created: 2021-02-07 17:10:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 7ef5977480d3e725e2f678541e41e237 SHA-1: 44cd5aa278e91e7cd06fb18b588ddd131797e2f2 SHA-256: a9e3bc2eb732632e6e8d08fe90a97d8c3c3c5c2a41db248254be456b29f8db54
200 Risk Score

Malware Insights

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

The sample is a malicious OOXML document containing VBA macros, specifically an AutoOpen macro that utilizes CreateObject. This indicates the document is designed to automatically execute malicious code upon opening. The ClamAV detection 'Doc.Downloader.BlueWord12210-9918949-0' strongly suggests a downloader functionality. The embedded artifact 'macros.bas' further supports the presence of VBA macros. The primary intent appears to be downloading and executing a secondary payload.

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
99408ecaeede979e11da4ccc30f147a2c761900a0799b432eb361c6a024e9222		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2305 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
012b60f7acd976b8374d734d116e6be12ef60808ababffec18d41cb8f4b2c41a		 vba-project OOXML VBA project: word/vbaProject.bin 98304 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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