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

Static analysis result for SHA-256 95dbf2d9c17b6275…

MALICIOUS

Office (OOXML) / .DOC

1.27 MB Created: 2022-11-01 14:58:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2022-11-11
MD5: 990d07ee9a1dba423a0a12923fee1b23 SHA-1: a669943beb6a0ef6ad692ee16f07b5e7aae7e435 SHA-256: 95dbf2d9c17b62754ab0bd95fa5b3423d643653f8f663b4e3f73f6e2f32d5977
230 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is an OOXML document containing a VBA macro. The macro utilizes CreateObject and Shell() calls, indicating an intent to execute arbitrary code. This is further supported by ClamAV detection as a downloader. The VBA script appears to be obfuscated, but the presence of these critical heuristics strongly suggests it functions as a downloader for a secondary payload.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Downloader.afc5c039d11fd238-9978787-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.afc5c039d11fd238-9978787-0
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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.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/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
87fc59d0da7c6efa2c459a5996423c4275ed3e4cbe87f41c2186e8ee97f31cac		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 17848 bytes
vbaProject_00.bin
176e814343ba412a1f3aa87e56861561785e305955d3d0f5627f23b41b01404b		 vba-project OOXML VBA project: word/vbaProject.bin 36864 bytes

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