Office (OOXML) / .XLSX malware analysis — malicious · 259d6c10c93fa4f7

MALICIOUS

Office (OOXML) / .XLSX

65.8 KB Created: 2025-05-01 16:27:21 UTC Authoring application: Microsoft Excel 14.0300

MD5: b165b489c5f8c4e136364664502d68f1 SHA-1: eb3032c062c9dc36100a4af9a501bc8fc118567d SHA-256: 259d6c10c93fa4f734b6ae7cf94a478ebee61d1268bf28befc009e71d609b207

268 Risk Score

Heuristics 7

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
VBA Base64-decoded Shell command stager critical OLE_VBA_BASE64_SHELL_COMMAND_STAGER

VBA auto-exec macro decodes Base64 string literals into command or script-launch text and executes the result with Shell. This catches cmd/cscript/PowerShell/VBS launchers hidden from plain keyword matching.
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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `ac55a455c6f4109207f810533ab8c6d00718ab563cbccc4873ddacff06d9e8f9`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	61252 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `6bf8c3eee2cca2413bafb57fb347f0bcccac6ddbc8f67dce6f96c454498d5018`	vba-project	OOXML VBA project: xl/vbaProject.bin	130048 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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