Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 fbb46cfc767affef…

MALICIOUS

Office (OOXML)

11.7 KB Created: 2021-01-18 06:33:02 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-01-23
MD5: ded2d07f703309e281fbd5a6a4a2f784 SHA-1: 8df3341111e48e766d7e99800b39408447659802 SHA-256: fbb46cfc767affef548fcc8dfa6775fe257278ab6fdb8d1d3caf762b1677e4ec
128 Risk Score

Heuristics 4

  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
        TaskID = Shell(Program, 1)
  • 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.
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Private Sub Auto_Open()

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) 894 bytes
SHA-256: ed4ed757d6f9a2dcb8664206d318f1aad261554c96de774aea4e52f938ccd383
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "현재_통합_문서"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Sheet1"
Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "Module1"
Private Sub Auto_Open()
    Dim Program As String
    Dim TaskID As Double
    On Error Resume Next
    Program = "calc.exe"
    TaskID = Shell(Program, 1)
    If Err <> 0 Then
        MsgBox "Can't start " & Program
    End If
End Sub
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 10752 bytes
SHA-256: 8f2c6cd272f8d6d2d395c9670140289b968ab13eee17600fe1e020a96e6fdfcb

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