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

Static analysis result for SHA-256 fd9015b85705e544…

MALICIOUS

Office (OOXML) / .DOC

104.0 KB Created: 2021-04-27 05:12:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 187c69fe8f5ffbfc1a8f512a52fcb8b9 SHA-1: cb9ce4ca96e10b8efda736dee160927f570682c8 SHA-256: fd9015b85705e5443d198b8cd09e1ef09113f93548e2e3d78f9ce681d7baa583
260 Risk Score

Malware Insights

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

The sample is an OOXML document containing VBA macros, indicated by the 'OOXML_VBA' heuristic. The presence of an 'AutoOpen' macro and critical heuristics for 'Shell()' and 'WScript.Shell' usage strongly suggest that the VBA code is designed to execute arbitrary commands. This is likely intended to download and execute a secondary payload, a common technique for malware delivery.

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://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
db7ea3debaf80b9e04486311d0741bd85de878ad3dd0893c803c3f2980a3c8f6		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 7012 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 macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
0ec2731b2600eb2fe464d88a4768c243f3e26ee27793351d5f6df22fa72fdeab		 vba-project OOXML VBA project: word/vbaProject.bin 31744 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 macro source contains an auto-exec entry point and execution/download terms.

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