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

Static analysis result for SHA-256 7f4c6a6b241a8953…

MALICIOUS

Office (OOXML) / .OLE

114.7 KB Created: 2020-07-14 10:26:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: aa4dd0e586a1d9591cc2b8d6e8355702 SHA-1: c17426aeba91d9c56fdeb6b2c7e41432bea5fb3e SHA-256: 7f4c6a6b241a89531e909def54254f995865431ae7d00ba5722b0bcdf52fb7ff
222 Risk Score

Malware Insights

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

The sample contains VBA macros with an AutoOpen subroutine, which is a common technique for executing malicious code upon opening a document. The script uses URLDownloadToFile to download a payload from 'http://n9i9ep.com/hboneb/sol95.php?l=puom9.cab' and saves it as 'uZ.tmp'. It then executes this downloaded file using 'regsvr32 uZ.tmp', indicating a downloader or droppper functionality.

Heuristics 6

  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • ClamAV: Doc.Downloader.GreenBox5-9139204-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.GreenBox5-9139204-0
  • 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 http://n9i9ep.com/hboneb/sol95.php?l=puom9.cab
    • 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
92189ec551814fa5d9943502924ee850b3580f23b674964cc16ba69daf61fbc8		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2606 bytes
vbaProject_00.bin
b7a5498b1921651da79af17242bda74ac23cbf6376aa2900930d340375ce9ab6		 vba-project OOXML VBA project: word/vbaProject.bin 24576 bytes

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