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

Static analysis result for SHA-256 fa938f6d0e9186f6…

MALICIOUS

Office (OOXML) / .DOC

273.4 KB Created: 2021-01-29 07:44:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2022-04-28
MD5: 30d8da3b39232f36b4b7a3136af025be SHA-1: 2ebfb4f93f5bc09a57f39aaf3cc55791e829dddf SHA-256: fa938f6d0e9186f6807633ee89ea80ef288a3d26a60965f0b3ceac812043d588
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The OOXML document contains VBA macros, specifically a Document_Open macro, which is a common technique for initial execution. The script decodes a Base64 string, suggesting it's designed to download and execute a second-stage payload. The document body discusses COVID-19 self-isolation, a common social engineering lure. The presence of a Document_Open macro and Base64 decoding strongly indicates malicious intent.

Heuristics 5

  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — VBA macros present
  • Suspicious extracted artifact info 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.
  • 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/2012/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
be321fc5c1aff99d32ee2b8e97a0eefd1667ff5a20bc526888bcfaa7b467ea84		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3526 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
vbaProject_00.bin
1efdc30f5cb86b965f439ff3cbf1c121da76bb071e42390d74ca0e2650efca2d		 vba-project OOXML VBA project: word/vbaProject.bin 13312 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).

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