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

Static analysis result for SHA-256 dc0a96044e29802a…

MALICIOUS

Office (OOXML) / .DOC

417.5 KB Created: 2020-03-11 13:24:00 UTC Authoring application: Microsoft Office Word 14.0000
MD5: a30496018c2667745d5d0c928ecee919 SHA-1: b3c1602dced6841a442a51fb0cd74930c22a4059 SHA-256: dc0a96044e29802ad08e520d53540d09e4b303547256b28cd53d999ab4fcd184
220 Risk Score

Malware Insights

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

The file is a Microsoft Office document containing VBA macros, specifically an AutoOpen macro which is designed to execute automatically. Heuristics indicate obfuscated VBA code and a suspicious extracted artifact, consistent with a dropper. ClamAV detection further confirms its malicious nature. The primary function appears to be downloading and executing a second-stage payload.

Heuristics 6

  • ClamAV: Doc.Dropper.Valyria-9768469-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Valyria-9768469-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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
3ecb8ee8c5a4e185d564ce087f6f7e551be937eb7da23c5bd59748c5adfe1408		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 210097 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 41 Chr/ChrW string-construction calls.
vbaProject_00.bin
cb852e3de766bc1b6e662cf8a7ffa00149be4afc081ee9c2f6581c174656bdc4		 vba-project OOXML VBA project: word/vbaProject.bin 704000 bytes
Detection
ClamAV: Doc.Dropper.Valyria-9768469-0
Obfuscation or payload: likely
Carved artifact contains 1588 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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