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

Static analysis result for SHA-256 046caa2db6cd1450…

MALICIOUS

Office (OOXML) / .DOC

334.8 KB Created: 2020-04-13 18:42:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: c014a2ac8c89abc3799a520da331caf5 SHA-1: 701296f6ff0daf3264dd8814c469b2c7f56df1ec SHA-256: 046caa2db6cd14509741890e971ddc8c64ef4cc0e369bd5ba039c40c907d1a1f
264 Risk Score

Malware Insights

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

The file is a malicious OOXML document containing VBA macros, specifically an AutoOpen macro that utilizes CreateObject. ClamAV detections indicate it is a dropper. The presence of VBA macros and the AutoOpen execution pattern strongly suggest the document's purpose is to download and execute a secondary payload, aligning with the typical behavior of a dropper.

Heuristics 8

  • ClamAV: Win.Dropper.Agent-10045433-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Dropper.Agent-10045433-0
  • 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
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — 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.microsoft.com/office/drawing/2014/chartex
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartex
    • 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/2015/wordml/symex
    • 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
ad52d9866ebb89b7b3fe6d1a00e6f8b2b001798dda672f1c786163c33715bf7d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 7987 bytes
vbaProject_00.bin
900305f37983033b3c59e801a87885747624f9ebb14c69bf692d19844decbb8b		 vba-project OOXML VBA project: word/vbaProject.bin 701440 bytes
Detection
ClamAV: Win.Dropper.Agent-10045433-0
Obfuscation or payload: likely
Carved artifact contains 3 long base64-like blob(s).

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