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

Static analysis result for SHA-256 b36600faab3eebec…

MALICIOUS

Office (OOXML) / .DOCM

43.0 KB Created: 2025-12-18 04:52:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2026-01-07
MD5: 4005b13264cb292064bada9fb3fa51e7 SHA-1: 4b2796bcc86f6f07696fd18213c6a509fd24fb6d SHA-256: b36600faab3eebec983dfc41b7004816b1fe53c1d0235f261e70b4b929ea0b0e
198 Risk Score

Malware Insights

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

The document contains VBA macros that attempt to save the document with a modified name and potentially interact with a domain named 'meruscase.com'. The presence of `Shell()` and `CreateObject()` calls, along with obfuscated shell commands containing URLs, indicates a downloader or droppper functionality. The 'Fake invoice / payment lure' heuristic further suggests a social engineering tactic to trick the user into enabling macros.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  • 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)
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 https://drive.meruscase.com/
    • https://drive-beta.meruscase.com/JOHNNYTEST.docx
    • https://drive-beta.meruscase.com/JOHNNYTEST.docx�
    • 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.microsoft.com/office/drawing/2015/10/21/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/drawing/2016/ink
    • http://schemas.microsoft.com/office/drawing/2017/model3d
    • http://schemas.microsoft.com/office/2019/extlst
    • 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/2018/wordml/cex
    • http://schemas.microsoft.com/office/word/2016/wordml/cid
    • http://schemas.microsoft.com/office/word/2018/wordml
    • http://schemas.microsoft.com/office/word/2023/wordml/word16du
    • http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahash
    • http://schemas.microsoft.com/office/word/2024/wordml/sdtformatlock
    • 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
5feb05e486a13130f99ca2c4cd954fa53ee5015ecde36ae8098e85cab615a626		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 6073 bytes
vbaProject_00.bin
0961e124e08de90ca967a1c0a1aa76c10049577a0d2ce98a3a06f9b4e39fe427		 vba-project OOXML VBA project: word/vbaProject.bin 19456 bytes

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