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

Static analysis result for SHA-256 729bbc2fe75fd620…

MALICIOUS

Office (OOXML) / .DOC

140.3 KB Created: 2021-01-27 17:21:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 1702b9b0f0be8021a23ca023e1b7338f SHA-1: 7ec5345314c3b5cea84c2ffb75e9423bf0d32726 SHA-256: 729bbc2fe75fd6206368e5db3d43110adbc44911329608d392632a1ba71ac271
262 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a Word document containing VBA macros. The Document_Open macro triggers the execution of other VBA functions. These functions attempt to construct a URL using a concatenated string and download a file from it using CreateObject to instantiate an object for HTTP requests. The downloaded file is then saved to disk, indicating a downloader functionality.

Heuristics 7

  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • ClamAV: Doc.Downloader.BlueWord12211-9918950-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.BlueWord12211-9918950-0
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open 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
  • 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 https://tellmese��oU�
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvas
    • http://schemas.microsoft.com/office/drawing/2014/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
    • https://login.windows.net/common/oauth2/authorize

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
ad0b06340a044ddf87f3b968e66777106cfa65c716a7df5e05aefdcda105d799		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2166 bytes
vbaProject_00.bin
d940a8821c4b5a1bf431680fa7be9bcbf46ce38e1a60af319df1a8fd65676618		 vba-project OOXML VBA project: word/vbaProject.bin 113664 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.