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

Static analysis result for SHA-256 983126bda297a471…

MALICIOUS

Office (OOXML) / .DOC

42.3 KB Created: 2021-12-15 09:14:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 923895a84751bb9beb67373e9e5241d4 SHA-1: 45b07571d2b31f57865096b54c5fffa51f3bf96f SHA-256: 983126bda297a4717f29a9bbf4ccc909851e4648ca99a721623bf0496e390195
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1218 Signed Binary Proxy Execution

The sample contains VBA macros, specifically an AutoOpen subroutine, which is a common technique for initial execution. The script utilizes the GetObject function with a reversed string to construct a command that appears to be related to executing a file, likely a downloader. The reconstructed command `GetObject("", text1("category")).exec StrReverse(" rerolpxe\swodniw\:c") + youGirlNext` suggests an attempt to execute a payload. The `autoopen` subroutine further constructs a filename `IAccessible2Proxy.exe` and saves it to a user-writable location, then calls the `s` function to execute it. This indicates the document's purpose is to download and execute a second-stage payload.

Heuristics 5

  • ClamAV: Doc.Downloader.BlueWord12210-9915312-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.BlueWord12210-9915312-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — 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
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
80eddf9fdb79d6de2266199845fcfb722e1e872ba8e136cec4d49acf3b9ee360		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 928 bytes
vbaProject_00.bin
5551064b1fdcd010313c0274034d2d790d370bb3552b2d4e2cd478064a03d658		 vba-project OOXML VBA project: word/vbaProject.bin 14336 bytes

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