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

Static analysis result for SHA-256 6b7b51feb85f6ddb…

MALICIOUS

Office (OOXML) / .DOC

113.4 KB Created: 2020-06-30 08:17:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 47a8b9e408676e340f7aa3657e06e181 SHA-1: 4c68293f6e118bc475863d5aa8ae9653c04f34fc SHA-256: 6b7b51feb85f6ddb4ce5b6df7ca291fb425961179ff9cc7efd8011bc64918ad9
222 Risk Score

Malware Insights

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

The sample contains a VBA macro with an AutoOpen subroutine that utilizes the URLDownloadToFileA function to download a file from the URL 'https://www.cursosler.com.br/wp-content/plugins/sheet-music-library/_LSojVUoCxtLM8CCy.php?x=MDAwMSBI5mjMY9uhZ_Ge4ugA2a4mweCkzjyiY8k9hif1mT_QT_9l09Dqn5F3_GtGg9PGdz53ooQKxk14NIuTaVEsxxLGyYDQBHHVHKZfLaCgwLYAAfMvW7TUscb-_HV11C8g-OOTyaoJH9AaVFz5jPeI' to 'c:\programdata\1.dat'. Subsequently, it attempts to execute this downloaded file using 'regsvr32 c:\programdata\1.dat'. This indicates a downloader pattern aiming to fetch and run a second-stage payload.

Heuristics 6

  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • ClamAV: Doc.Downloader.GreenBox6-9139694-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.GreenBox6-9139694-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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://www.cursosler.com.br/wp-content/plugins/sheet-music-library/_LSojVUoCxtLM8CCy.php?x=MDAwMSBI5mjMY9uhZ_Ge4ugA2a4mweCkzjyiY8k9hif1mT_QT_9l09Dqn5F3_GtGg9PGdz53ooQKxk14NIuTaVEsxxLGyYDQBHHVHKZfLaCgwLYAAfMvW7TUscb-_HV11C8g-OOTyaoJH9AaVFz5jPeI
    • https://www.cursosler.com.br/wp-content/plugins/sheet-music-library/_LSojVUoCxtLM8CCy.php?x=MDAwMSBI5mjMY9uhZ_Ge4ugA2a4mweCkzjyiY8k9hif1mT_QT_9l09Dqn5F3_GtGg9PGdz53ooQKxk14NIuTaVEsxxLGyYDQBHHVHKZfLaCgwLYAAfMvW7TUscb-_HV11C8g-OOTyaoJH9AaVFz5jPeI�
    • 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.microsoft.com/office/drawing/2015/10/21/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/drawing/2016/ink
    • http://schemas.microsoft.com/office/drawing/2017/model3d
    • 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/2018/wordml/cex
    • http://schemas.microsoft.com/office/word/2016/wordml/cid
    • http://schemas.microsoft.com/office/word/2018/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
b0bf001c8ed9a0032e39e5c9777684bf20ff708bce405001fd674317ca789ee9		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2163 bytes
vbaProject_00.bin
03bb337ca93a3af1d30d534be05ed22247b93f4f5e9e72571be54c4b2a19d0ee		 vba-project OOXML VBA project: word/vbaProject.bin 19456 bytes

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