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

Static analysis result for SHA-256 5524769e8ac5d5b5…

MALICIOUS

Office (OOXML) / .DOC

34.8 KB Created: 2011-11-10 08:56:00 UTC Authoring application: Microsoft Office Word 12.0000
MD5: 965a46b652ed3976024f981bb54136b3 SHA-1: da1a2f16ff5e7be912e56556135d12a444c64b23 SHA-256: 5524769e8ac5d5b5d1eb0c0a1f8e5b4cbec8e0ec06e58ccb85a46be5f02abc3f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1105 Ingress Tool Transfer

The sample contains a VBA macro that triggers on Document_Open and displays a form (frmStart) which allows a user to enter a URL, credentials, and a destination path. The script explicitly calls a function 'DownloadFile' using the user-provided 'txtURL.Text' and 'txtPfad.Text'. No hardcoded C2 URLs were found in the extracted scripts, as the input is taken from the user via the interface.

Heuristics 6

  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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.openxmlformats.org/markup-compatibility/2006
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2006/wordml

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
b195b2fe7c0aef39b1bd5c846665a1af58ded3a0afac881f5c400c2e19c2b19e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3175 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
3590bd8b274ec930ceb7d4d917de4560d56c273ae6f2af421570ae160fa95a4d		 vba-project OOXML VBA project: word/vbaProject.bin 24576 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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