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

Static analysis result for SHA-256 38cc20967d2c0a54…

MALICIOUS

Office (OOXML) / .XLSM

3.36 MB Created: 2021-04-18 22:18:27 UTC Authoring application: Microsoft Excel 16.0300
MD5: c5695f88d80642378828f9310536df49 SHA-1: 2c9c3398010a479a80395980c74639df00a0ada8 SHA-256: 38cc20967d2c0a54f1c967b22bafdc20936ebb45d236f1a3ebcb24d2c48a2fb6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell

This XLSM file contains a Workbook_Open macro that utilizes the Shell() function, indicating it's designed to execute arbitrary commands upon opening. The presence of VBA macros and the specific use of Shell() strongly suggest a malicious intent to download and execute further payloads or establish a backdoor. No specific family could be identified, but the technique is common for initial access.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7ab9e31bf1ff386358216bc2839e628097e34899b7478c21c2f657320529db03		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 8388608 bytes
vbaProject_00.bin
509ca5654ab9a799c1001a68b5b41260448e675100ba7c66f4b4f7c904e6b722		 vba-project OOXML VBA project: xl/vbaProject.bin 3770880 bytes

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