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

Static analysis result for SHA-256 b5bcca3f7acacbba…

MALICIOUS

Office (OOXML) / .DOC

76.7 KB Created: 2021-03-17 05:37:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 4443129a1cf17795def6a98c295be4e5 SHA-1: 676104d54ea45606d3f33d378d96989fd0121eee SHA-256: b5bcca3f7acacbba51461351f01d9b9248e05ac3982f78832004288408411be8
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

This OOXML document contains a VBA macro with an AutoOpen function, indicating it will execute automatically upon opening. The macro utilizes WScript.Shell and CreateObject to execute commands, strongly suggesting it's designed to download and execute a second-stage payload. The presence of encoded blobs within the extracted artifacts further supports this. No specific family could be identified, but the delivery mechanism is clear.

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://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
f69c72da9ae5b82af7fe6c51cb7c7cae143bb6dcc9fe5505a913990631772cf1		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3021 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
b9ab982ca9f378922ead461cbb332d5c57ac3c0a8af267c02ceeb96b234087b7		 vba-project OOXML VBA project: word/vbaProject.bin 30208 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 4 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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