Dm over Cm (minor triad over minor triad a half step apart).
C        E♭          G     A              D        F
1        ♭3          5     6              9        11

Parent scales are C melodic minor (no 7) or B♭ major (no 1).
C     D  E♭    F     G     A
1     2  ♭3    4     5     6

Related chords.
| Cm6 | E♭maj7♯11 | F13 | Am7♭5 | B7♯5♯9 |