Office (OLE) / .XLSX malware analysis — malicious · 4217fe730587c7b9

MALICIOUS

Office (OLE) / .XLSX

53.0 KB Created: 2025-09-26 11:33:59 Authoring application: Microsoft Excel

MD5: 309d85b67d087bdae7305a3095db2c07 SHA-1: 4a5796dd27945d404b54e115d6327f0074b5c956 SHA-256: 4217fe730587c7b9118e03ea9d8199b09cd2356d80547b68f5de294f6e34136a

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell

The critical heuristics indicate the presence of VBA macros that utilize WScript.Shell and the Shell() function, specifically within the Workbook_Open auto-exec event. This strongly suggests the macro is designed to execute arbitrary commands upon opening the document, likely to download and run a secondary malicious payload. No specific family could be identified from the available evidence.

Heuristics 8

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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 macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `5e562a6bcef7e76d8de4240ad1ae2f47719d0d1045c1614aa7d00edea8890fe6`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	25072 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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