Office (OOXML) / .XLSM malware analysis — malicious · 960a10f03a65b1f5

MALICIOUS

Office (OOXML) / .XLSM

224.0 KB Created: 2026-01-27 07:26:24 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2026-01-27

MD5: b4fe5e22662240b9f22b9bd2c595438b SHA-1: 9b5161ce6245f370844ca2deb58a9f3ba6f00465 SHA-256: 960a10f03a65b1f5a9ee9f8452b13f53c9ed84103dfe5506f92957055f2d0697

490 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The Auto_Open VBA macro within the XLSM file is designed to execute upon opening. It constructs a temporary path for an executable, downloads a file from 'https://y2025u.zyns.com/downloads/millnos.exe' using MSXML2.XMLHTTP, saves it to the temporary path, and then executes it using WScript.Shell. This indicates a dropper functionality, aiming to download and run a secondary payload.

Heuristics 12

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
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.
ClamAV: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
Auto_Open macro high OLE_VBA_AUTO

Auto_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 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)
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://y2025u.zyns.com/downloads/millnos.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `2a55c889017601b9e189656b35aec4fdce2853d278c1a7b710de4329be9290d8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1456 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` `d595b1dab60662177001d6c2d3fe474c12d450a3ad79aaae319b57ce0a4d5b90`	vba-project	OOXML VBA project: xl/vbaProject.bin	14848 bytes
Detection ClamAV: Doc.Dropper.Agent-6412232-1 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.

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