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

Static analysis result for SHA-256 b9dcf7fe7e8ba30d…

MALICIOUS

Office (OOXML) / .DOC

329.5 KB Created: 2022-12-12 07:53:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2022-12-17
MD5: bf41074e39bb3abbe4e4640401e7e655 SHA-1: 326575e1df8e63ccc3f8283c6bf01b186dac7088 SHA-256: b9dcf7fe7e8ba30d363a19c2c43fc3eea93d281b10f6ee89cffe2a3e533af442
422 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

This OOXML document contains a VBA project with an AutoOpen macro. The macro utilizes WScript.Shell to execute a command, likely downloading and running a secondary payload from the reconstructed URL 'infotechkorea.com/gnuboard4/adm/cmg/upload'. The presence of Shell() and CreateObject calls, along with the ClamAV detection, strongly indicates a downloader functionality.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Doc.Downloader.Valyria-10021468-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Valyria-10021468-0
  • 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
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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
6ab5d34cb2d75d49390eb105e72b8195ae3c678cc5f1c059a11ba15daeed4e6a		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 4160 bytes
vbaProject_00.bin
58ec00e85fb9411a36e3620b5b57b6bc91a70caa02dd878c766b0889d5a53a98		 vba-project OOXML VBA project: word/vbaProject.bin 16384 bytes
Detection
ClamAV: Doc.Downloader.Valyria-10021468-0
Obfuscation or payload: unlikely

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