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

Static analysis result for SHA-256 22dd253059418b02…

MALICIOUS

Office (OOXML) / .DOC

55.6 KB Created: 2021-03-02 09:01:00 UTC Authoring application: Microsoft Office Word 15.0000
MD5: 10b4773a35e693761089a4bddae588eb SHA-1: a498e2e5fea8a9c562c2ef137c2d4cf26f857dfe SHA-256: 22dd253059418b02367aadb10e071d5c4edaf7cf12876538330d7990e38e2409
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The OOXML document contains a VBA macro with an AutoOpen function, which is a common technique for executing malicious code upon opening the document. The script appears to be a downloader, indicated by the presence of a base64 decoding function and a call to WinExec, suggesting it attempts to download and execute a second-stage payload. The specific payload and its ultimate destination are not fully discernible due to script truncation and obfuscation.

Heuristics 5

  • 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.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
831b8f826982a781db5d1cbeca3609b88218d3002a8b3ade3aabce36131e58d3		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 12606 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
93381a82a454ab514248216111e15f0ecc3d2486d77b6a81c654e8908e078be6		 vba-project OOXML VBA project: word/vbaProject.bin 82944 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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