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

Static analysis result for SHA-256 34b100faba875e8a…

MALICIOUS

Office (OOXML) / .DOC

116.8 KB Created: 2020-10-26 19:59:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 744ae70b0a259567b7a5b20c935a99a4 SHA-1: 04f291433c147e90ef5ad334f4d9f746a59dc9c0 SHA-256: 34b100faba875e8aa4cb7250929827ecc9cb581c748723105a6bdd037c860807
200 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with the signature Doc.Downloader.87e88716f38ff820-OOXML-9981520-0. Static analysis revealed the presence of VBA macros, specifically an AutoOpen macro and a CreateObject call, indicating that the document is designed to execute code upon opening. The primary function of the embedded VBA macros is to download and execute a second-stage payload, as suggested by the 'Downloader' classification in the ClamAV signature.

Heuristics 6

  • ClamAV: Doc.Downloader.87e88716f38ff820-OOXML-9981520-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.87e88716f38ff820-OOXML-9981520-0
  • 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.microsoft.com/office/drawing/2015/9/8/chartex
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/drawing/2016/ink
    • http://schemas.microsoft.com/office/drawing/2017/model3d
    • 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/2018/wordml/cex
    • http://schemas.microsoft.com/office/word/2016/wordml/cid
    • http://schemas.microsoft.com/office/word/2018/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
52a7087865568aaea30e9ece313fc90a23158deec048cbe351ac79fece37c6f3		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 14832 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
8f70e40ecf6d1f407e780238ef53d318eb920683cae8583c9469a371addf0042		 vba-project OOXML VBA project: word/vbaProject.bin 50688 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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