The purpose of the present study was to evaluate members’ perceptions of the therapeutic factors during a group intervention that was designed to mitigate the adverse psychological effects of the coronavirus pandemic and the imposition of restrictive measures, their satisfaction with the online format of the intervention, and how these are associated with the intervention’s outcomes. The participants (
N
= 44,
M
age
= 31.93,
SD
= 8.09) were Greek adults who attended a 2-week, voluntary, online group intervention. To assess the effectiveness of the intervention, 1 week before and 1 week after implementation, participants completed several questionnaires measuring their demographic characteristics, empathy, resilience, affectivity, feelings of loneliness, depression and anxiety levels, and feelings of fear regarding the outbreak. One week after the intervention, they also completed two questionnaires evaluating the therapeutic factors and their satisfaction and impressions regarding telemental health counseling. Analyses showed that the most frequently cited therapeutic factor was guidance, followed by acceptance, self-disclosure, universality, and instillation of hope. Therapeutic factors of catharsis, self-disclosure, guidance, self-understanding, vicarious learning, and therapeutic alliance correlated with elements of empathy, resilience, loneliness, positive emotions, symptoms of anxiety and depression, and fear of the coronavirus. Satisfaction with the online format of the intervention was associated to universality, elements of empathy, and symptoms of depression. More specifically, member satisfaction was negatively correlated with improvement in personal distress and depression, an unexpected finding that may be attributed to the brief duration of the present intervention. The practical value of the results for the development and implementation of online psychological interventions during a crisis is discussed.