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

Static analysis result for SHA-256 087f280bd15ff4d6…

MALICIOUS

Office (OOXML) / .DOC

138.6 KB Created: 2021-02-07 17:10:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: d612e17a508ae4bc63f7703436cdb1d1 SHA-1: 1ff1bdbec720b5e414c680a80d21af8d4ce70d87 SHA-256: 087f280bd15ff4d60132b385341ba80dce18095a990a20e9ed3f8f8895154841
322 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1566.001 Spearphishing Attachment

The sample contains VBA macros, including an AutoOpen macro, which is a common technique for malicious Office documents. The script uses CreateObject to download a file from 'http://statblogger.com/header.jpg' and saves it as 'C:\users\Public\wt.jpg', indicating an attempt to download and execute a second-stage payload. ClamAV also detected this file as a downloader.

Heuristics 8

  • 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.BlueWord-9845926-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.BlueWord-9845926-0
  • 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
  • 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.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
126868c373a9de2b36e49ebb59d50be71a4f3c0e7a68f55250546fe02cf4fe7a		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2200 bytes
vbaProject_00.bin
c0e4946864773efc5dc2d3cb714ed093087304444499bc7135020e2cc3637f1f		 vba-project OOXML VBA project: word/vbaProject.bin 96256 bytes
Detection
ClamAV: Doc.Downloader.BlueWord-9845926-0
Obfuscation or payload: unlikely

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