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

Static analysis result for SHA-256 73c2a5f2bbdc8f7f…

MALICIOUS

Office (OOXML) / .XLSM

70.2 KB Created: 2021-04-18 22:18:27 UTC Authoring application: Microsoft Excel 16.0300
MD5: 53a4a6dc337a8cd7099d12823f6d4190 SHA-1: 6c8ad206fd716b99639519fb6bba5083a2454c61 SHA-256: 73c2a5f2bbdc8f7f56d90ba428eec9e6cf6928de6f55772864aaa4aa064207f5
200 Risk Score

Malware Insights

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

The file is an XLSM document containing VBA macros, specifically a Workbook_Open macro that utilizes Shell() and CreateObject() calls. This indicates the macro is designed to execute arbitrary commands upon opening the document, likely to download and run a second-stage payload. No specific family could be identified, but the technique is common for initial access.

Heuristics 6

  • 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
  • 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.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
569fd5bb09d765dafec07b9e565c9167d6cc92b84bf22930d09b46906162317d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 9114 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
9f1ec2c950344fd71269e8667016f28ffa278aafecfa300f6bd34b500997d6dc		 vba-project OOXML VBA project: xl/vbaProject.bin 7168 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.