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

Static analysis result for SHA-256 084df2038f17b7ba…

MALICIOUS

Office (OOXML) / .DOC

117.8 KB Created: 2020-06-24 09:06:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: ae8af2a2dcb43172606776b31173c51a SHA-1: 56d05ff0f9a86b1de7b5574a5670327349125c85 SHA-256: 084df2038f17b7baf3f9feec455cb5280dea237a5643d824a060c6f3078c871c
342 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample is a Microsoft Office document containing VBA macros. The AutoOpen macro executes a function that uses URLDownloadToFile to download a payload from a URL, and then uses WScript.Shell.Exec to execute it. This indicates a downloader functionality, likely leading to further malicious activity.

Heuristics 8

  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • VBA URLDownloadToFile reversed-LOLBin launcher critical OLE_VBA_URLDOWNLOAD_REVERSED_LOLBIN
    VBA auto-exec macro downloads a payload with URLDownloadToFile and launches it through WScript.Shell.Exec using a reversed command string. This is a high-confidence downloader/launcher pattern, not an Office parser CVE.
  • ClamAV: Doc.Downloader.Mrkb-8213933-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Mrkb-8213933-0
  • 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
  • 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.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
03086697f6be2d5a8e23f81a2cee6882e5ee375e3dccc4513659ff469e5037b1		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5054 bytes
vbaProject_00.bin
7933ceb0659c6ba2b0e32022e4d2bd4ad21d2e497a5a0456e4702deb9bb860b3		 vba-project OOXML VBA project: word/vbaProject.bin 30208 bytes
Detection
ClamAV: Doc.Downloader.Mrkb-8213933-0
Obfuscation or payload: unlikely

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