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

Static analysis result for SHA-256 453e7a4314783cce…

MALICIOUS

Office (OOXML) / .DOC

79.7 KB Created: 2021-05-06 07:49:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: c4b0617006900fdfdd3eaa762c68a8ef SHA-1: 4ce54af01029c685759fe181dcc80633a0044630 SHA-256: 453e7a4314783ccee4547d5be1f17bd841599bebe9f9f6d8d3ba0b05be7cb059
260 Risk Score

Malware Insights

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

The OOXML document contains VBA macros, indicated by the 'OOXML_VBA' heuristic. The presence of an 'AutoOpen' macro and critical heuristics like 'OLE_VBA_SHELL' and 'OLE_VBA_WSCRIPT' strongly suggest that the macro is designed to execute arbitrary commands. The 'EXTRACTED_FILE_STATIC_TRIAGE' heuristic further supports this, noting script execution terms and obfuscation. The primary intent appears to be downloading and executing a second-stage payload, though no specific URLs for this payload were extracted.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • 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://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.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
4a2737149e901263dfef371424dd24cccf068a03b5a73fb572cc5f98fcf40c02		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 6314 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 8 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
8f9772bc99e3fd03a123d95d23bcdd38867ce02114a3a0b8c9ac6aacdefcd9b9		 vba-project OOXML VBA project: word/vbaProject.bin 30208 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 8 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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