EarlierBlue — Office (OOXML) / .DOCX malware analysis

Static analysis result for SHA-256 4aae0d83b803f80d…

MALICIOUS

Office (OOXML) / .DOCX

255.1 KB Created: 2020-03-19 09:02:00 UTC Authoring application: Microsoft Office Word 14.0000
MD5: 327c6d5487cfa96d71c67212d6e19011 SHA-1: 25fa932f085e354899d3f2c3c73ab7933f6dbcda SHA-256: 4aae0d83b803f80da8841723184837badb9e969136a7013bd297a6ee0251b977
160 Risk Score

Malware Insights

EarlierBlue · confidence 95%

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

The file is a malicious OOXML document detected as Doc.Downloader.EarlierBlue00222-7648367-0 by ClamAV. It contains a VBA macro that is automatically executed via the AutoOpen function. This macro is designed to download and execute a second-stage payload, which is characteristic of the EarlierBlue malware family. The presence of the AutoOpen macro and the ClamAV detection strongly indicate a downloader functionality.

Heuristics 5

  • ClamAV: Doc.Downloader.EarlierBlue00222-7648367-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EarlierBlue00222-7648367-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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.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/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
2660fa21ee79511f337dc4b59182ade80e9dd1286fb82cf3f9eecc338d89803f		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 230224 bytes
vbaProject_00.bin
2415e65c0ff356b005a92aa058e57915d1e91d8aab794563117153901b88c341		 vba-project OOXML VBA project: word/vbaProject.bin 1015808 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1885 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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